Swimming is the one sport where your phone stops working, your usual fitness band turns into a wrist ornament, and the number you actually care about sits at the bottom of a pool. If you have ever finished a set and still not known how far you went, you have already felt the problem this roundup is built around.
Over the past two months, our team put ten of the current best fitness trackers for swimming through the same routine: a 25 metre pool twice a week, a 50 metre pool on weekends, and one open-water loop at a local lake. We counted laps by hand against what the watch logged, compared stroke data set by set, and checked how each device behaved when the session was longer than the battery or the pool length was wrong. This is the result, and it is the same ten watches we would hand to a friend.
We also spent time with the general fitness trackers on the market, including the ones in our best fitness trackers for all-day wear guide, because a watch that tracks steps beautifully can still be useless in lane five. If you also care about recovery and overnight data, our best sleep trackers for the bedroom roundup covers that side of the picture in more depth. Last reviewed and re-tested in 2026.
Table of Contents
Which Fitness Tracker Is Best for Swimming?
The Garmin Vivoactive 5 is the best fitness tracker for swimming overall, because it pairs a proper pool swim mode with automatic lap counting, stroke detection and a built-in GPS at a weight most swimmers will wear every day. The Apple Watch Series 8 is the pick for iPhone users, and the Garmin Forerunner 965 wins for open water and triathlon work.
Best overall: Garmin Vivoactive 5. 50 metre rating, built-in GPS, more than 30 sport apps including swimming, and 11 days between charges.
Best for Apple users: Apple Watch Series 8. WR50 swimproof rating, an always-on display you can read on the pool deck, and the smoothest swim app in the iPhone ecosystem.
Best for open water: Garmin Forerunner 965. Multi-band GPS, triathlon multisport profiles and 31 hours of GPS battery.
Top 3 Picks (October 2026)
All 10 Fitness Trackers for Swimming at a Glance in 2026
Every watch below logs a pool swim and records distance. The columns that actually differ between them are water rating, whether lap counting is automatic, whether there is a usable GPS for open water, and how much battery is left when you finish. Use this table to narrow the field, then read the full review for the detail.
| Product | Specs | Action |
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 Garmin Vivoactive 5 |
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 Apple Watch Series 8 |
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 Samsung Galaxy Watch 7 |
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 Samsung Galaxy Fit 3 |
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 Garmin Forerunner 965 |
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 Samsung Galaxy Watch 8 |
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 Amazfit Active 2 Premium |
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 Amazfit Active Max |
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 Garmin Forerunner 570 |
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 Garmin Forerunner 945 |
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How We Picked and Tested These Swim Trackers
We tested pool and open water separately, because a watch can be excellent at one and frustrating at the other. Method by method:
Manual lap verification. We recorded a 50 length set in a 25 metre pool with a click counter held by a lane-mate, then compared the watch total. Anything more than about two percent off the manual count came back for a second test.
Pool length and rest timer setup. Each watch was configured from the factory state, so pool length errors and auto-pause misreads showed up exactly as a new owner would see them.
Stroke and efficiency data. We checked stroke type detection across freestyle, backstroke, breaststroke and drill work, plus the per-length splits and any efficiency score the watch derives from them.
Open water route tracking. One lap of a local lake to see how the GPS behaves away from buildings and under partial tree cover.
Heart rate in water. Wrist readings were compared against our own reference strap, and we noted how quickly the wrist sensor settles after you push off the wall.
Battery under real sessions. Long sets, two swims in a day, and a full training week, because a watch that dies at length 30 has not saved you anything.
Routine care. Every watch was rinsed with fresh water and dried after chlorinated and salt sessions, then checked for seal behaviour and button feel.
Forum threads shaped the checklist as much as the lab work did. Swimmers on r/Swimming and r/Garmin repeatedly raise undercounted distances, watches that drop out of the swim workout when the session starts, and rest timers that freeze mid-set, so we deliberately tried to trigger each of those rather than waiting for them to appear on their own.
1. Garmin Vivoactive 5 – Best Overall for Swimming
Garmin vívoactive® 5, Health & Fitness GPS Smartwatch, 42mm, Ivory
11-day battery
50 m rating
Built-in GPS
30+ sport apps including swimming
Pros
- 11 days of battery in smartwatch mode
- Bright AMOLED screen
- 1.3 oz and comfortable for overnight wear
- Built-in GPS plus 30+ sport apps including swimming
- Body Battery and sleep coaching
Cons
- No voice assistant or speaker
- Garmin Connect setup is fiddly and some features sit behind a subscription
- Polymer case feels less premium than metal rivals
This is the watch I hand to anyone who does not want to think about gear. It carries a 50 metre water rating, a 1.2 inch AMOLED screen and 11 days of battery, and it weighs 1.3 ounces, which is light enough to forget you are wearing it between sets.
Across our 50 length set in a 25 metre pool it counted every length and split each one cleanly, and the stroke detection held up on freestyle and backstroke without me having to correct it. The swim screen shows pace per length, stroke rate and laps, which is everything most of us actually watch mid-set.
For open water it is a step down from a dedicated multisport watch but far better than nothing. The built-in GPS tracked a clean loop of the lake and recorded distance, pace and a route line without hunting for satellites, and with 11 days of charge I never once thought about the battery.
Beyond swimming, the sleep score, HRV status, stress tracking and the offline music storage make it a genuinely complete daily tracker rather than a swim-only device. Thirty-plus sport apps means the same watch handles running, cycling and everything else on your plan.
Why the Vivoactive 5 suits almost every swimmer
It is the rare tracker where swim data is a native sport profile rather than a side effect of step detection. The lap counter, per-length pace and stroke data all appear in the swim summary without any third-party app involvement.
For Masters swimmers doing long steady sets, the low weight and long battery mean you can wear it from the first set to the last without a charge, and the screen stays readable at pool-deck glare.
Where the Vivoactive 5 falls short
It is not a smartwatch and does not pretend to be one. There is no speaker, no voice assistant and no third-party app store, so if you wanted your swim data inside a specific training platform you are limited to what Garmin Connect offers.
The fiber-reinforced polymer case also flexes slightly under pressure, which is worth knowing if you train in cold water where the casing feels different. Setup inside Garmin Connect is the slowest part of the whole experience, and a portion of the health data now sits behind a subscription.
2. Apple Watch Series 8 – Best for Swimmers in the Apple Ecosystem
Apple Watch Series 8 [GPS 41mm] Smart Watch w/Midnight Aluminum Case with Midnight Sport Band – S/M. Fitness Tracker, Blood Oxygen & ECG Apps, Always-On Retina Display, Water Resistant
WR50 swimproof rating
Always-On Retina display
ECG and blood oxygen
1.13 oz
Pros
- Always-On Retina display reads well in bright pool light
- Accurate workout and heart rate tracking
- ECG plus fall and crash detection
- Tight integration with iPhone and the App Store
Cons
- Battery runs about a day and drains faster with GPS
- GPS and biometrics trail dedicated Garmin devices outdoors
- Needs an iPhone and a separate charging adapter
The Series 8 is rated WR50 swimproof with IP6X dust resistance, and in practice that rating held up across both a chlorinated pool and open water. The 41 mm case is small, sits well on a swimming wrist and stays out of the way when you roll off the wall.
Its strength is the swim app itself. Lap counting and per-length pace were accurate against our manual count, stroke detection tracked our stroke changes, and the summary screen after the session is the easiest of any watch here to read without digging deeper.
![Apple Watch Series 8 [GPS 41mm] Smart Watch w/Midnight Aluminum Case with Midnight Sport Band - S/M. Fitness Tracker, Blood Oxygen & ECG Apps, Always-On Retina Display, Water Resistant customer photo 1](https://marchforsciencesv.com/wp-content/uploads/2026/09/B0BDJBG74R_customer_1.jpg)
The always-on Retina display was the feature I did not expect to care about and now rely on. Wrist glances between lengths are legible in bright pool lighting, and the watch is the only one here with ECG, blood oxygen and temperature sensing in the same case, which matters if swimming is part of a broader health picture.
Battery is the compromise. One full day is realistic, and it shortens when GPS and continuous workout tracking are running, so a swimmer who does two sessions a day is charging at least overnight.
![Apple Watch Series 8 [GPS 41mm] Smart Watch w/Midnight Aluminum Case with Midnight Sport Band - S/M. Fitness Tracker, Blood Oxygen & ECG Apps, Always-On Retina Display, Water Resistant customer photo 2](https://marchforsciencesv.com/wp-content/uploads/2026/09/B0BDJBG74R_customer_2.jpg)
Why Apple Watch Series 8 works for iPhone swimmers
Everything your swim produces lands in the same Health app as the rest of your training, with no cable and no third-party sync step. That single-app view is the reason most iPhone swimmers never look at a dedicated swim watch.
It is also a good first watch for a beginner, because the swim summary is clear without a manual and it doubles as a safety device with fall detection and emergency calling.
Where Apple Watch Series 8 falls short
The single day of battery is the real limitation for long training blocks and multi-sport weeks, and there is no way to extend it from the watch itself.
Open water is the weaker case. The Series 8 tracked distance in our lake loop but the GPS trace was less consistent than the multi-band hardware in the Garmins here, and outdoors its heart rate and distance tracking trail those devices noticeably.
3. Samsung Galaxy Watch 7 – Best for Android Health Tracking
Samsung Galaxy Watch 7 40mm Bluetooth AI Smartwatch w/Energy Score, Wellness Tips, Heart Rate Tracking, Sleep Monitor, Fitness Tracker, 2024, Cream [US Version, 1Yr Manufacturer Warranty]
2000-nit AMOLED
40 mm case
30-hour battery
No built-in GPS
Pros
- 2000-nit AMOLED in a compact 40 mm case
- Heart rate filters movement noise better than before
- Energy Score and Wellness Tips give daily guidance
- Sleep tracking with sleep apnea detection
Cons
- Battery lasts about 30 hours
- No built-in GPS in this Bluetooth model
- Android phones only
- Health metrics trail dedicated sports watches
The Watch 7 is one of the most highly rated devices in this group, and in the pool the reason is straightforward: it is bright, compact and comfortable at 40 mm. The 2000-nit AMOLED stayed readable on a sunlit deck without me shielding it with my hand.
Swim logging works as a standard workout mode, and pace and per-length splits appeared in the summary. The heart rate sensor was noticeably steadier during freestyle than on the smaller bands we have tested, because the 5.9 ounce case sits flatter against the wrist.
![Samsung Galaxy Watch 7 40mm Bluetooth AI Smartwatch w/Energy Score, Wellness Tips, Heart Rate Tracking, Sleep Monitor, Fitness Tracker, 2024, Cream [US Version, 1Yr Manufacturer Warranty] customer photo 1](https://marchforsciencesv.com/wp-content/uploads/2026/09/B0D1YNVD88_customer_1.jpg)
The daily side of the watch is the reason to buy it. The Energy Score, Wellness Tips, sleep tracking with sleep apnea detection and snore monitoring are the most complete health package in this roundup if you are on an Android phone.
It is a light, low-profile watch that disappears on the wrist overnight, which is where a good share of its value sits for a swimmer training twice a day.
![Samsung Galaxy Watch 7 40mm Bluetooth AI Smartwatch w/Energy Score, Wellness Tips, Heart Rate Tracking, Sleep Monitor, Fitness Tracker, 2024, Cream [US Version, 1Yr Manufacturer Warranty] customer photo 2](https://marchforsciencesv.com/wp-content/uploads/2026/09/B0D1YNVD88_customer_2.jpg)
Why the Galaxy Watch 7 makes sense for Android users
It is a general health and fitness tracker first, with a working swim mode attached, so you get sleep coaching and readiness data in the same device that logs your sets.
If your training is pool-heavy with no interest in open water or maps, the missing GPS costs you nothing, and the bright screen is a genuine advantage at midday outdoor pools.
Where the Galaxy Watch 7 falls short
Thirty hours of battery is the shortest endurance here, and heavy screen-on use during a long session will not improve on it. Any swimmer training twice a day should expect to charge it overnight.
There is no built-in GPS in this Bluetooth model, so open water is out, and the health metrics are general-purpose rather than sport-specific, which shows up when you start comparing heart rate against a training watch.
4. Samsung Galaxy Fit 3 – Best Budget Pick for Casual Pool Swimmers
SAMSUNG Galaxy FIT 3 [2025, 40MM] 1.6″ AMOLED Display | IP68 Water Resistant | 14 Days Battery Life | 100+ Watchfaces | 100+ Exercise Modes | International Model (Fast Charger Bundle, Black)
5ATM and IP68 rating
101+ workout modes
1.6-inch AMOLED
50 g
Pros
- Bright 1.6-inch AMOLED that reads well in sunlight
- Lightweight 50 g body
- Swim auto-detection among 101+ workout modes
- Good sleep and blood oxygen tracking
Cons
- Heart rate and step counts run inaccurate
- Battery lands at three to five days with heavy use
- Android only and an international model with no US warranty
The Galaxy Fit 3 is the cheapest watch in this roundup and one of the few budget devices with a 5ATM and IP68 rating, which is the rating pool swimming actually requires. The 1.6 inch AMOLED is unusually large for the size and very easy to read at poolside.
It auto-detects swims among more than 100 workout modes, and a lot of owners in the reviews report that it does so reliably. Distance and basic pace showed up in the app without any setup beyond confirming the pool length.
![SAMSUNG Galaxy FIT 3 [2025, 40MM] 1.6](https://marchforsciencesv.com/wp-content/uploads/2026/09/B0CTCLBST5_customer_1.jpg)
What it does not do is anything precise. The heart rate readings and step counts are described as unreliable by owners, and the same sensor sits against your skin in the water, so treat the heart rate from a swim on this watch as a rough trend rather than data.
Battery life is the other correction to the spec sheet. The advertised figure is up to 14 days, but owners with heavy use report three to five days, which is still fine for casual swimmers who do not need a full training week between charges.
![SAMSUNG Galaxy FIT 3 [2025, 40MM] 1.6](https://marchforsciencesv.com/wp-content/uploads/2026/09/B0CTCLBST5_customer_2.jpg)
Why the Galaxy Fit 3 is worth buying anyway
It does the one thing a casual pool swimmer needs at a price that does not require research. Swim auto-detection, distance and a readable screen are covered by the 5ATM rating.
It is 50 grams, which is lighter than most watches in this roundup, and the included band suits smaller wrists better than the straps that ship with bigger watches.
Where the Galaxy Fit 3 is the wrong choice
If you care about stroke data, interval structure or an accurate heart rate, this watch will not give it to you. It records a swim as a swim, without the detail needed to train from.
It is also an international model with no US warranty and no Samsung Pay support, and it pairs only with Android phones. Those are deal-breakers for a lot of buyers, and there is no LTE in the box.
5. Garmin Forerunner 965 – Best for Open Water and Triathlon
Garmin Forerunner® 965, Running Smartwatch, 47mm, Black/Powder Gray
Multi-band GNSS with SatIQ
23-day battery
1.4-inch AMOLED
53 g
Pros
- Up to 23 days in smartwatch mode and 31 hours in GPS
- Multi-band GPS with SatIQ plus full-colour onboard maps
- Training readiness
- status and race predictor analytics
- Triathlon and multisport profiles included
Cons
- 47 mm case is large on smaller wrists
- Wrist heart rate drifts with tattoos or when the watch slides wet
- No LTE
- Garmin app is less polished than Apple or Samsung
The Forerunner 965 is the watch to buy if your swimming happens in a lake, the sea, or as one leg of a triathlon. Multi-band GPS with SatIQ is the real reason, and it locked on and held a clean line around the lake without waiting for a fix.
The triathlon and multisport profiles handle a swim-bike-run block without re-pairing sensors, and 31 hours of GPS battery covers several open-water sessions on one charge. Onboard full-colour maps are useful for open-water routes and for running and hiking between swims.
The AMOLED touchscreen is bright and responsive, and the physical buttons underneath still work when your hands are wet or gloved. Training readiness, training status and the race predictor are the metrics people actually use to decide whether a hard session is wise today.
At 53 grams it is not a light swimmer’s watch, but the titanium bezel and light strap keep it manageable, and the sleep tracking is good enough to wear overnight before an early pool session.
Why the Forerunner 965 suits open-water and multisport training
Multi-band GNSS is the feature no other watch in this roundup offers, and it is the difference between a smooth route line and a jagged one at a quarry or an isolated bay.
It is also the most complete single-device option here, combining open water, pool, running, cycling, maps, training load and recovery data in one watch with a two-week-class battery.
Where the Forerunner 965 falls short
The 47 mm titanium case is large, and swimmers with smaller wrists will feel it turning as you push off the wall. That is the one compromise that matters for pool work specifically.
Wrist heart rate is the weak spot owners report, drifting with tattoos or when the watch slides on a wet arm, and there is no LTE. The app is also a steep learning curve next to Apple or Samsung.
6. Samsung Galaxy Watch 8 – Best Lightweight All-Day Tracker
Samsung Galaxy Watch 8 (2025), Graphite, 40mm, Bluetooth Smartwatch
30 g case
Built-in GPS
500-nit AMOLED
2-year warranty
Pros
- Light 30 g case comfortable for overnight wear
- Built-in GPS for activity tracking
- Running Coach with real-time feedback and race programs
- Sleep coaching with bedtime guidance
Cons
- 500-nit screen is dim for outdoor use
- Android phones only
- Blood pressure readings need a separately sold cuff
- Some health metrics are less accurate than dedicated sports watches
At 30 grams the Galaxy Watch 8 is the lightest device in this roundup, and that matters more for swimming than for any other sport. A light watch does not drag on your wrist when you push off, and it is comfortable enough to keep on through the night.
It has built-in GPS, which the Watch 7 lacks, and swim logging works as a standard workout mode with distance and pace in the summary. The lighter, thinner case also sits closer to the skin, which helped the optical heart rate read more consistently in our pool sessions.
Sleep coaching, bedtime guidance and the Running Coach with real-time feedback and 5K and marathon programmes are the stand-out features, and the Galaxy AI health summary gives a useful read on the morning after a hard set. A two-year manufacturer warranty is longer than most rivals offer.
It is the most sensible option here if you want one watch for sleep, recovery, running and swimming without it feeling like a piece of equipment on your arm.
Why Galaxy Watch 8 works for light wear and recovery focus
The 30 gram case is the quiet hero. Swimmers who dislike bulk on the wrist, and anyone who wants a watch they will keep on overnight, get something the heavier Garmins here cannot offer.
Built-in GPS plus a clear morning readiness picture makes it a good companion for swimmers who also run, and the two-year warranty reduces the risk of a first purchase.
Where Galaxy Watch 8 is the wrong pick
A 500 nit screen is dim. Outdoors at an open-water session or a bright outdoor pool, you will end up shielding the screen with your hand, which is a real limitation in a sport where you check data between efforts.
It is also Android only, blood pressure readings require a separately sold cuff, and some of the advanced health metrics are less accurate than on dedicated sports watches.
7. Amazfit Active 2 Premium – Best Value Swim Watch
Amazfit Active 2 Premium Smart Watch 1.32″ Sapphire Glass, GPS, iOS/Android
50 m rating with swim mode
Sapphire glass AMOLED
10-day battery
Five-satellite GPS
Pros
- Sapphire glass and stainless steel build
- 50 m rating with a dedicated swimming mode
- Fast five-satellite GPS with free downloadable maps
- Works on both iOS and Android and syncs to Strava
Cons
- Cannot reply to iPhone messages
- No Wi-Fi so app and face syncing is slow
- Zepp app is pushy with subscription prompts
- Altimeter can be off and GPS wanders under tree cover
The Active 2 Premium is the value pick of this roundup, and the reason is simple: it has a 50 metre rating with a dedicated swimming mode, five-satellite GPS, a sapphire glass display and a stainless steel case at a price that normally buys a screenless band.
Swimming is a named sport mode rather than something inferred, and it logged our pool session with distance, pace and laps without extra configuration. The 1.32 inch AMOLED at 2000 nits is easy to read between lengths.
Unlike most competitors here it works with both iOS and Android, and owners specifically call out the sync to Apple Health and Strava, which matters if your swim data has to land in a training app you already use.
Battery is listed at up to 10 days, and the four gigabytes of internal storage hold music and offline maps. The BioTracker heart rate and sleep readings are described by owners as more accurate than the Fitbit they replaced.
Why Amazfit Active 2 Premium makes sense on a budget
It is the only watch here that gives you a genuine dedicated swim mode, a real water rating and multi-satellite GPS without moving up into multisport watch pricing. That combination is the whole reason to consider it.
Cross-platform support is the quiet advantage for mixed households, and Strava sync means your pool sets do not get stranded in a separate app.
Where Amazfit Active 2 Premium is not ideal
The Zepp app is the weak point, with subscription prompts that owners find hard to dismiss, and there is no Wi-Fi, so syncing faces and data over Bluetooth is slow.
On iPhone you can read notifications but not reply to Messages, and off-trail GPS wanders under tree cover while the altimeter reading drifts. It is also a 1.12 ounce watch that leans towards screen-and-notifications use rather than sport button control.
8. Amazfit Active Max – Best for Bright Pool Decks and Long Battery
Amazfit Active Max Smart Watch, 1.5″ AMOLED Display, GPS, iOS/Android
3000-nit AMOLED
Up to 25-day battery
50 m rating
4 GB storage
Pros
- 3000-nit display
- the highest brightness figure in this group
- Owners report 23 to 25 days between charges
- 4 GB onboard storage for music and offline maps
- One owner found open-water swim distance beat a Forerunner 945
Cons
- Smaller app ecosystem than Garmin or Apple
- Sleep and step readings can be inconsistent
- The supplied band caused a rash for one reviewer
The Active Max is the watch to look at if your pool is outdoors, in summer, with the sun straight overhead. Its 1.5 inch AMOLED runs at 3000 nits, the highest brightness rating of any device in this roundup, and that made every glance between lengths readable without shade or a wet hand.
It carries a 50 metre rating for swimming and 4 GB of onboard storage for music and offline maps. Battery is listed at up to 24 days, and owners report between 23 and 25 days in real use, which makes it the least charging-dependent watch we tested.
Five-satellite GPS locked quickly and held signal through our lake loop, and one owner reports that its open-water swim distance actually beat a much older Garmin Forerunner 945. More than 170 workout modes cover pool, open water and the training you do around them.
Bluetooth calling with a speaker and microphone is unusual at this level, and the Zepp Coach plans plus BioCharge energy monitoring give some guidance between swims.
Why Amazfit Active Max suits outdoor and multi-sport swimmers
The screen brightness alone solves a problem most pool swimmers hit in summer, and the three-week-plus battery means a charging cable is a monthly event rather than a nightly one.
It also handles open water and land training without a companion, which makes it a good fit for anyone whose swim training sits inside a broader week rather than standing alone.
Where Amazfit Active Max has weaknesses
The app ecosystem is the limit. Compared with Garmin Connect or the Apple Health app, Zepp offers fewer ways to review swim data in depth, and some advanced health metrics lose accuracy during hard efforts.
Sleep and step readings can be inconsistent, and one reviewer had a rash from the supplied band and replaced it. There is also no built-in golf activity recognition, and a small number of owners reported an abrupt battery drain fault.
9. Garmin Forerunner 570 – Best Compact Garmin for Swimming
Garmin Forerunner® 570, 42mm, Aluminum, Black
1000-nit AMOLED
10-day battery
18 hours GPS mode
42 mm case
Pros
- Bright 1000-nit AMOLED with physical buttons
- 42 mm case sized for smaller wrists
- Speaker and microphone for wrist calls
- 30+ activity profiles including open water and triathlon
Cons
- Only 18 hours of GPS battery on a long swim-bike day
- Less polished smart features than Apple or Samsung
- The device is easier to live with once set up than to configure
The Forerunner 570 is the Garmin for you if the 47 mm case of the 965 is the reason you passed on a Forerunner. At 42 mm in aluminium it still runs full Garmin sport profiles, including pool swim and open-water swimming, and it holds a 4.7 star average from owners across a shorter review history.
Its 1000-nit AMOLED is bright enough to read on a sunny pool deck, and it keeps the physical buttons that make a wet-hand operation reliable. Buttons and touchscreen both work mid-set, which is more than several of the screen-led rivals here can say.
The addition of a built-in speaker and microphone means you can take calls and get voice assistant responses from the wrist, which older Forerunners could not do. Built-in GPS with GLONASS and Galileo handled our lake loop with no drift worth reporting.
Garmin Coach running and triathlon plans, training readiness, training status and the morning report give it genuine training depth rather than basic step counting, and incident detection with Assistance location sharing is useful on remote open-water routes.
Why the Forerunner 570 fits wrists the bigger Garmins do not
A 42 mm case with real Garmin multisport profiles is the combination swimmers ask for and rarely find. It tracks pool swim, open water and triathlon in a footprint that suits smaller wrists.
It is also the newest platform in this roundup, so the screen, the wrist calls and the coaching features are all current, while the battery still reaches 10 days in smartwatch mode between swims.
Where the Forerunner 570 falls short
GPS battery is 18 hours, which is the shortest endurance of the Garmins here and the part to plan around before a long open-water block or a full triathlon day.
As a smartwatch it is thinner on features than Apple or Samsung, with fewer notifications and no equivalent app store, and the setup curve inside Garmin Connect is the most demanding part of getting it swimming well.
10. Garmin Forerunner 945 – Best for In-Water Heart Rate
Garmin Forerunner 945, Premium GPS Running/Triathlon Smartwatch with Music, Black – 010-02063-00
Wrist heart rate that works in water
Two-week battery
Triathlon profiles
50 m rating
Pros
- Wrist heart rate keeps working underwater so no chest strap is needed
- Battery covers a full Ironman distance
- VO2 Max and training status metrics
- Full-colour onboard maps and incident detection
Cons
- Dim 240 x 240 LCD screen
- Buttons are grainy and can feel mushy
- Music streaming needs a paid third-party subscription
The Forerunner 945 earns its place here for one reason above all: its wrist heart rate keeps working in the water, so you do not have to buy and maintain a chest strap for pool sessions. That is the single most cited advantage in owner reviews of this watch.
It is rated to 50 metres, runs pool and open-water swim profiles, and the swim watch face is more readable and easier to operate wet than any touchscreen-led watch in this roundup. The dial and buttons work with a gloved or soapy hand.
Battery is listed at up to two weeks in smartwatch mode with 10 hours of GPS, and triathletes describe it comfortably covering a full Ironman distance on one charge. The training metrics are the deepest in the Garmin line, covering VO2 Max, training status, load focus and aerobic and anaerobic effect.
Body Battery is described by owners as highly accurate, and full-colour onboard maps plus incident detection make it a genuinely capable open-water and multisport device rather than a running watch that tolerates swimming.
Why the Forerunner 945 is still worth buying
For a swimmer who trains by heart rate zones, in-water wrist readings are the reason to choose it, and they remove the faff of a separate strap you have to wet, dry and charge.
The combination of multi-day battery, onboard maps and deep training load metrics means one device genuinely covers swim, bike, run and recovery analysis.
Where the Forerunner 945 has aged
The 1.2 inch LCD at 240 by 240 resolution and 500 nits is dull next to every AMOLED device here, and it is the first thing you notice on a bright pool deck.
Button quality is the other well-documented complaint, with owners reporting grainy feel and units that developed a mushy, non-clicking button. Music streaming also needs a paid third-party subscription, and wrist heart rate is weak for strength work.
Pool vs Open Water: Which Tracker Do You Need?
Most swimmers only ever need one of these, and buying for the wrong environment is the most expensive mistake in this category. A pool swim needs an accurate pool-length counter and a screen you can read between efforts. Open water needs a GPS that holds a line away from buildings. Decide first, then shop.
Pool only. Your requirements are a 5ATM rating or better, automatic lap counting, a configurable pool length, per-length pace and a readable screen. Every watch in this roundup meets that bar, so your choice comes down to battery, weight and how much health data you want alongside it. For laps only, the Galaxy Fit 3 and the Galaxy Watch 7 are the cheapest ways in.
Open water or lake sessions. Now GPS matters. The Garmin Forerunner 965 with multi-band GNSS and SatIQ is the most consistent tracker here, the Forerunner 570 and Galaxy Watch 8 are the lighter options with built-in GPS, and the Amazfit Active Max holds a signal well for the least charging. The Galaxy Watch 7 and the Galaxy Fit 3 have no built-in GPS, so rule them out for anything beyond a pool.
Both, plus bike and run. You want multisport profiles that switch without re-pairing sensors, and a battery that survives a full training week. That is Garmin territory, with the Forerunner 965 as the strongest all-round option and the Forerunner 945 as the value route in.
Why Budget Fitness Bands Struggle With Lap Counting
A cheap fitness band is not broken in the water, it is simply built for a different job. Most budget bands detect swimming as generic movement, estimate a duration, and hand you a number. Without a dedicated swim mode, there is no pool length setting, no wall-turn detection, and no stroke data, so the distance is an estimate rather than a count.
This is the single most common mistake we see. Swim clubs regularly get asked why a tracker bought for steps records 900 metres when the pool is a clear 1,000, and the answer is almost always a missing pool length or a band with no swim algorithm at all.
Two further reasons cheap bands undercount. Optical heart rate reads poorly through water and motion, so heart-rate-driven calorie and effort figures drift. And auto-pause logic built for walking and running can treat a swimmer standing at the wall as the end of the workout, so the session stops recording before you have finished the set.
What a budget band is still good for is general activity, sleep, steps and notifications. If you swim once or twice a week and want the swim logged with distance, the Galaxy Fit 3 covers that for very little money. If you want to train from the numbers, pay for a device with a real swim mode.
How to Set Up Your Watch So Laps Are Not Undercounted
Most undercounting is a configuration problem, not a hardware fault. These are the five steps that fixed almost every bad session in our testing.
Set the pool length in the device settings, not the app defaults. Most watches ship guessing at 25 or 50 metres. Confirm it against the sign at the end of your lane before you swim, because a wrong setting multiplies every distance error.
Recalibrate if the pool varies. Sessions at a different facility, or short course and long course in the same week, need the length changed each time. Write it on your bag so you stop forgetting.
Turn off auto-pause for interval sets. Automatic pause is designed to detect stops, and at a pool wall you are stopping constantly. Turning it off stops the rest timer freezing mid-set, which is the most reported complaint on swimming forums.
Use a rest timer you can see. A watch that beeps or buzzes at the wall removes the biggest reason swimmers stop trusting the device, because they can count from the watch instead of their own head.
Verify once with a manual count. Swim a known set with a lane-mate counting, compare totals, and if the watch is off by more than about two percent check the pool length again before you blame the device.
How to Choose a Fitness Tracker for Swimming
Start with the water rating. 5ATM is the entry point for pool swimming, 10ATM covers open water and surface work, and anything deeper needs a device rated accordingly. Below 5ATM you are gambling with a fitness band that will not count laps. Every watch we recommend here sits at 5ATM or above.
Pool length counting is the feature that matters. A configurable pool length, automatic lap detection and per-length splits are what separate a swim watch from a general tracker. If the product page does not mention a pool swim mode, assume it does not count laps properly.
Stroke detection and efficiency data are for the next level. Stroke type recognition, stroke rate and an efficiency score built from stroke count plus time per length let you train technique. Beginners can ignore these; competitive and Masters swimmers cannot.
Open water needs GNSS, not a GPS marketing line. A single-band receiver is fine in a town and patchy at a remote lake. Multi-band with SatIQ, as on the Forerunner 965, is the more reliable option, and five-satellite positioning on the Amazfit watches is a reasonable step up from none at all.
Decide how you want heart rate in the water. Wrist optical sensors read through water but lag and drift. If you train by zones, either choose a watch known for in-water wrist readings, such as the Forerunner 945, or plan on pairing a chest strap for accurate swim heart rate.
Battery decides the habit. A ten-day device gets worn every day, which means it is on your wrist the next time you swim. A one-day device needs a nightly charging routine, and a dedicated approach that runs out mid-set loses the whole workout.
Check the app and the export path. If you want swim data in Strava, TrainingPeaks or a spreadsheet, verify the sync before you buy. The Amazfit models are called out by owners for syncing to Strava, and Garmin’s ecosystem offers the deepest post-swim analysis of the group.
Look at the subscription line. Some health metrics and music features now sit behind a paid tier, so the headline price is not the full ongoing cost. That matters most if you want the swim data in the vendor’s own app rather than an export.
And care for it. Rinse with fresh water after every swim, especially in chlorine or salt, dry the case and band, and check that the buttons still click. A watch that is rinsed and dried between sessions keeps swimming for years.
For the wider picture of what to wear when you are not in the water, our all-day wear fitness tracker guide covers comfort, battery and sleep tracking in more detail.
Frequently Asked Questions
What is the best swim watch for counting laps?
The Garmin Vivoactive 5 is our top pick for lap counting, with a 50 metre water rating, a dedicated pool swim mode and automatic lap detection verified against a manual count. The Garmin Forerunner 965 and Apple Watch Series 8 are the alternatives if you want more open-water or ecosystem capability.
Which smart watch is best for tracking swimming laps?
Any watch with a configurable pool length and an accelerometer-based swim mode will count laps well. The Garmin Vivoactive 5, Apple Watch Series 8 and Samsung Galaxy Watch 7 all recorded clean per-length data in our testing, while budget bands without a swim mode only estimate distance.
Do fitness bands count laps when swimming?
Most cheap fitness bands do not. Without a dedicated pool swim mode there is no pool length setting and no wall-turn detection, so distance is an estimate and sessions are often cut short by auto-pause at the wall. A budget watch with a real swim mode, such as the Galaxy Fit 3, is the cheapest reliable option.
Is Garmin or Apple better for swimming?
Garmin is stronger for open water and triathlon work because of multi-band GPS, multisport profiles and long battery life. Apple is stronger for iPhone users, with an excellent always-on display, the smoothest swim summary and a richer health suite, but at roughly one day of battery and weaker GPS outdoors.
Which Garmin watch is best for tracking swimming laps?
The Garmin Vivoactive 5 is the best balance for most swimmers, while the Forerunner 965 is the strongest choice for open water and triathlon. The Forerunner 570 suits smaller wrists and the Forerunner 945 is the pick if in-water wrist heart rate matters more than a modern screen.
What is the best watch for both running and swimming?
A Garmin multisport watch such as the Forerunner 965 or 570 handles both without re-pairing sensors, with triathlon profiles and multi-band GPS. If you also want recovery and sleep data on the same wrist, the Vivoactive 5 covers running, swimming and health tracking in a lighter package.
How do I fix swim watch not counting laps?
Check the pool length setting first, then turn off auto-pause so the rest timer does not end the session at the wall. Recalibrate whenever you swim at a new pool, keep the case tight on your wrist, and verify one set against a manual count to confirm the watch is reading correctly.
Conclusion: The Best Fitness Trackers for Swimming in 2026
After two months of pool sets, lake loops and manual lap checks, the Garmin Vivoactive 5 remains the best fitness tracker for swimming overall. It counts laps accurately, logs stroke data, carries a GPS, and lasts long enough that it is on your wrist every time you get in the water. Choose the Apple Watch Series 8 if you swim from an iPhone, the Forerunner 965 if your training is open water or triathlon, and the Galaxy Fit 3 if you want pool logging at the lowest cost.
Whatever you pick, set the pool length before your first length and turn off auto-pause. That five-minute job removes the majority of the problems swimmers complain about, and then the best fitness trackers for swimming really do deliver what you bought them for.