Best Waterproof Fitness Trackers for Swimming (2026)
What are the best waterproof fitness trackers for swimming in 2026?
TL;DR
Top pick: Garmin Forerunner 265 (~$442) — all four strokes, SWOLF, pool drill mode and underwater HR on an AMOLED watch.
Best value: COROS PACE 3 (~$199) — 30g multisport with 17-day battery.
Best budget: Fitbit Charge 6 (~$120) — reliable 5ATM lap counting under $150. [src1, src2, src7]
Summary
The 2026 swim tracker market splits into three tiers: swim-capable multisport watches (Garmin Forerunner 265, Forerunner 165), premium multisport devices (Apple Watch Ultra 3, Garmin fenix 8), and affordable fitness bands with swim modes (Fitbit Charge 6, Apple Watch SE 3). The key differentiator remains swim-specific metric accuracy — stroke type detection, SWOLF scoring, and whether heart rate is usable at all underwater. There is no longer a dedicated swim watch to buy: Garmin retired the Swim 2 in May 2025 and never shipped a successor, folding its swim features into the Forerunner and fenix lines instead. The Forerunner 265 (~$442) carries everything the Swim 2 did — all four strokes, SWOLF, drill mode, underwater optical HR — and the Forerunner 165 (~$222) is the cheapest live Garmin that still does pool and open-water swims. [src1, src7, src8]
For triathletes and multisport athletes, the COROS PACE 3 (~$199) delivers excellent swim tracking in a 30g package with 17-day battery life, though it lacks underwater heart rate. The Apple Watch Ultra 3 (~$700) is the premium all-rounder: WR100 plus EN13319 certification, a depth gauge, water temperature sensor and 42-hour battery, and it now costs less on Amazon than the outgoing Ultra 2 does. Budget swimmers get solid lap counting and pace data from the Fitbit Charge 6 (~$120) or the Apple Watch SE 3 (~$219), though neither reports SWOLF. [src4, src6, src10]
Two head- and arm-mounted devices solve the problem wrist watches cannot. The FORM Smart Swim 2 goggles (~$199) project live splits, stroke count and heart rate onto the lens and carry their own temple-mounted optical HR sensor, so no wrist-checking and no wrist-flexion artefacts. The Polar Verity Sense (~$105) is an optical HR armband that clips to a goggle strap and records in-water heart rate to onboard memory for any watch or platform — the cheapest honest fix for the single weakest measurement in swim tracking. [src9, src5, src7]
Top 11 Models Compared
Prices are for the exact configuration named — case size, band and GPS-vs-cellular variants are separate listings at different prices.
| Model (configuration) | Price | Water Rating | Stroke Detection | SWOLF | Underwater HR | Battery | Best For | Buy |
|---|---|---|---|---|---|---|---|---|
| Garmin Forerunner® 265 (46mm, GPS) | ~$442 | 5ATM | Yes (4 strokes) | Yes | Yes (wrist optical) | 13 days | Best pool watch overall | Check price |
| Garmin Forerunner® 165 (43mm, GPS) | ~$222 | 5ATM | Yes (4 strokes, pool) | Yes (pool only) | Yes (wrist optical) | 11 days | Cheapest live Swim 2 replacement | Check price |
| Apple Watch Ultra 3 (49mm, GPS + Cellular) | ~$700 | WR100 (10ATM) + EN13319 | Yes (auto) | Yes | Yes (wrist optical) | 42h | Premium all-rounder, dive-capable | Check price |
| COROS PACE 3 (46mm, GPS) | ~$199 | 5ATM | Yes (4 strokes) | Yes | No | 17 days | Triathletes on a budget | Check price |
| FORM Smart Swim 2 (goggles, HR model) | ~$199 | Swim-rated goggles | Yes (head-mounted) | Yes | Yes (temple optical) | 14h swim | Technique + live HUD feedback | Check price |
| Polar Verity Sense (armband HR sensor) | ~$105 | WR50 (swim-rated) | No (sensor only) | No | Yes (best in-water accuracy) | 30h | Accurate in-water HR with any watch | Check price |
| Fitbit Charge 6 (Obsidian/Black band) | ~$120 | 5ATM | No | No | Limited | 7 days | Casual swimmers, budget | Check price |
| Apple Watch SE 3 (40mm, GPS) | ~$219 | WR50 (5ATM), ISO 22810 | Yes (auto pool) | No | Yes (wrist optical) | 18h | iPhone users, budget Apple | Check price |
| Garmin fēnix® 8 (47mm AMOLED) | ~$980 | 10ATM + EN13319 dive | Yes (4 strokes) | Yes | Yes (wrist optical) | 29 days | Open water + diving | Check price |
| Samsung Galaxy Watch 7 (44mm, Bluetooth) | ~$186 | 5ATM + IP68 | Yes (basic) | No | Yes (wrist optical) | 40h | Android users | Check price |
| Amazfit T-Rex Ultra 2 (51mm titanium) | ~$550 | 10ATM | Yes (4 strokes) | Yes | Yes (wrist optical) | 30 days | Rugged outdoor + swim | Check price |
Best for Each Use Case
Best for Pool Swimmers: Garmin Forerunner 265 (~$442) — Check price
With no dedicated Garmin swim watch left in the line-up, the Forerunner 265 is the pool default. It detects all four strokes with near-perfect accuracy, counts laps reliably, calculates SWOLF per length, includes a pool drill mode, and reads underwater optical heart rate for freestyle and backstroke — everything the retired Swim 2 did, plus a brighter AMOLED display and richer Garmin Connect analytics. 46mm case, 5ATM, 13-day smartwatch battery. If you already own a Swim 2 it still works; there is simply no new stock. [src1, src7, src8]
Cheapest Live Swim 2 Replacement: Garmin Forerunner 165 (~$222) — Check price
When Garmin retired the Swim 2, it pointed swimmers at the Forerunner 165 as the affordable equivalent, and that still holds: 43mm AMOLED, 5ATM, pool swim with lengths, turns, SWOLF and drill logging, plus an open-water swim profile. The trade-offs are real — single-band GPS (worse than the 265 in open water), no maps, and SWOLF and per-length metrics appear in pool mode only. It has also been superseded in Garmin's range by the Forerunner 170 (~$296), so treat the 165 as an outgoing model bought purely on price. [src1, src5, src8]
Best Premium All-Rounder: Apple Watch Ultra 3 (~$700) — Check price
WR100 under ISO 22810 plus EN13319 dive-accessory certification, a built-in depth gauge, water temperature sensor and recreational scuba to 40m with a third-party app. Battery is up to 42 hours (72 in Low Power Mode), a real gain over the Ultra 2's 36. The 3000-nit display stays readable underwater, triathlon mode handles transitions automatically, and swim data flows into Apple Health and Strava. It replaced the Ultra 2 in Apple's line-up and now sells for less on Amazon than remaining Ultra 2 stock — there is no reason to buy the older one. Breaststroke detection is still weaker than Garmin's. [src4, src6, src10]
Best for Triathletes: COROS PACE 3 (~$199) — Check price
At just 30 grams it barely registers on the wrist during transitions. Handles pool laps with stroke detection, SWOLF, pace and distance; open water mode uses dual-frequency GPS for distance. No underwater heart rate is the trade-off — pair a Polar Verity Sense if you need it — but the 17-day battery means you never worry about charge on race day, and COROS charges nothing for its training platform. [src5, src1]
Best Underwater Heart Rate: Polar Verity Sense (~$105) — Check price
The honest answer to in-water heart rate is not a watch. The Verity Sense is an optical sensor worn on the upper arm or clipped to a goggle strap at the temple, where the skin contact is stable and the arm is not flexing through the stroke. It records to onboard memory during swims (Bluetooth and ANT+ do not transmit through water) and syncs to Polar Flow, Garmin, COROS, Apple Health, Strava and TrainingPeaks afterwards. 30-hour battery, swim-rated to 50m, and about a quarter the price of a watch upgrade. [src4, src1]
Best for Technique Training: FORM Smart Swim 2 (~$199) — Check price
A heads-up display inside the goggle lens shows real-time splits, stroke count, pace, distance and heart rate while you swim — no stopping to check a wrist. The Smart Swim 2 adds an integrated optical heart rate sensor at the temple (the $149 LT model drops it), a SwimStraight digital compass for sighting in open water, and 14 hours of swim time per charge. Core metrics need no subscription; open-water distance and pace still need a paired Garmin or Apple watch for GPS. [src7, src9]
Best Budget: Fitbit Charge 6 (~$120) — Check price
Tracks laps, duration, pace and calories in a dedicated swim mode with 5ATM water resistance. No stroke-type detection and no SWOLF, but solid basic swim data for fitness swimmers who want to know how far and how fast they swam. Google integration, 7-day battery and a slim band. Note the price: it has traded between $89 and $160 in 2026, so the "under $100" framing only holds during sales — at $119.95 it is still the cheapest credible swim tracker here, but it is no longer an $85 watch. [src3, src2, src6]
Best for Open Water + Diving: Garmin fenix 8 (~$980) — Check price
10ATM rated with EN13319 dive certification, a dedicated dive mode, built-in flashlight and offline maps. Handles pool swims, open water, snorkelling and recreational diving; multi-band GPS holds signal in tree-lined lakes where cheaper watches drift. AMOLED display, 29-day battery in smartwatch mode, 47mm case. Overkill for pool-only swimmers, unmatched for varied open water. [src5, src4]
Head-to-Head Comparisons
Garmin Forerunner 265 vs Apple Watch Ultra 3
The Forerunner 265 (~$442) wins on dedicated swim metrics — better breaststroke and butterfly detection, pool drill mode, all four strokes, and a 13-day battery built for daily wear. The Ultra 3 (~$700) wins on rugged build, WR100 plus EN13319, depth gauge, satellite messaging and tighter iPhone integration, with 42-hour battery. Pay the premium only if you swim AND dive AND want one Apple device for everything. [src1, src4, src10]
Pick Garmin Forerunner 265 if: you swim 3+ days a week in a pool and want the most accurate stroke/SWOLF data at well under the Ultra 3's price.
Pick Apple Watch Ultra 3 if: you're already in the Apple ecosystem, do recreational diving or open-water sighting, and want one device for swim + everyday smartwatch use.
COROS PACE 3 vs Garmin Forerunner 265
The PACE 3 (~$199) is half the weight (30g vs 47g) with a 17-day battery vs 13 days, and is about $240 cheaper at street price. The Forerunner 265 (~$442) has a brighter AMOLED display, multi-band GPS for open water, deeper Garmin Connect analytics (training readiness, race predictor), and underwater optical HR, which the PACE 3 lacks entirely. [src1, src5]
Pick COROS PACE 3 if: you're a triathlete or budget-conscious multisport athlete who values battery life and wrist weight, and you're happy pairing an HR sensor.
Pick Garmin Forerunner 265 if: you want in-watch HR, the better open-water GPS, and the deeper training platform.
Garmin Forerunner 165 vs Garmin Forerunner 265
Both are 5ATM Garmins with pool swim, SWOLF and stroke detection, and both replace what the Swim 2 used to do. The 165 (~$222) is half the price with an 11-day battery and a smaller 43mm case; the 265 (~$442) adds multi-band GPS (materially better open-water distance), more training metrics, and keeps more swim data outside pool mode. [src1, src5, src8]
Pick Garmin Forerunner 165 if: you swim in a pool, want Garmin swim metrics for the least money, and can live with single-band GPS and an outgoing model.
Pick Garmin Forerunner 265 if: you swim open water, or you want the watch to still be current in two years.
Fitbit Charge 6 vs Apple Watch SE 3
At current prices (~$120 vs ~$219) the Charge 6 wins on price, battery (7 days vs 18 hours) and form factor — a slim band you never take off. The SE 3 wins on display, app ecosystem, automatic pool-swim detection with stroke recognition, crash detection and Apple's FDA-cleared ECG-adjacent health features. Neither reports SWOLF. [src2, src6]
Pick Fitbit Charge 6 if: you want a discreet 24/7 tracker that doesn't need daily charging and you're on Android or platform-agnostic.
Pick Apple Watch SE 3 if: you have an iPhone and want a true smartwatch with notifications, apps and richer swim detection.
FORM Smart Swim 2 vs Polar Verity Sense
These are the two products that fix in-water heart rate, at very different prices. FORM (~$199) puts the sensor at the temple AND shows live metrics in your line of sight, so it also coaches pace and stroke count mid-lap. The Verity Sense (~$105) does one job — record accurate in-water HR and hand it to whatever watch or platform you already use. [src1, src9]
Pick FORM Smart Swim 2 if: real-time technique and pacing feedback mid-lap matters and you train alone without a coach.
Pick Polar Verity Sense if: you already own a swim watch and only need the heart-rate number it cannot measure reliably.
Decision Logic
If budget < $150
→ Fitbit Charge 6 (~$120) covers basic pool tracking at the lowest price. It lacks SWOLF and stroke-type detection but delivers reliable lap counting and pace. If in-water heart rate is the priority instead, a Polar Verity Sense (~$105) paired to a phone or existing watch buys more accuracy than any $120 watch. [src2, src6]
If primary use is pool laps
→ Garmin Forerunner 265 (~$442) — best stroke detection, pool drill mode, SWOLF and underwater HR. Cheaper Garmin with the same core pool metrics: Forerunner 165 (~$222). [src1, src7, src8]
If user is a triathlete
→ COROS PACE 3 (~$199). Lightest multisport watch at 30g, 17-day battery, strong swim + run + bike tracking. Or Apple Watch Ultra 3 (~$700) if budget allows and the iPhone ecosystem is required. [src1, src5]
If user wants real-time feedback while swimming
→ FORM Smart Swim 2 (~$199). The only product that shows metrics in your line of sight via an in-goggle HUD, and it measures heart rate at the temple rather than the wrist. [src7, src9]
If user needs accurate underwater heart rate
→ Polar Verity Sense (~$105) on the upper arm or goggle strap — the most accurate in-water option at any price, and it works with the watch you already own. Second choice: FORM Smart Swim 2 (~$199). No wrist-worn watch here is reliable for breaststroke or butterfly. [src1, src4, src9]
If user is on Android
→ Samsung Galaxy Watch 7 (~$186) for the best smartwatch experience (note the Galaxy Watch 8 has since replaced it, so buy the 7 on price). Or COROS PACE 3 / Garmin Forerunner 265 for better swim metrics — both work fully with Android. [src6, src4]
If user swims open water or dives
→ Garmin fenix 8 (~$980) for 10ATM, EN13319 dive mode, offline maps and multi-band GPS; Apple Watch Ultra 3 (~$700) for the same water rating with a depth gauge and satellite messaging. Amazfit T-Rex Ultra 2 (~$550) is the cheaper 10ATM rugged option. [src4, src5, src10]
Default recommendation
→ Garmin Forerunner 265 (~$442). The safest pick for any swimmer who wants accurate, detailed pool data now that no dedicated swim watch exists. Step down to COROS PACE 3 (~$199) or Forerunner 165 (~$222) for value, or up to Garmin fenix 8 / Apple Watch Ultra 3 only if open water, diving or ecosystem lock-in matters. [src1, src2, src7]
Key Market Trends (2026)
- The dedicated swim watch is extinct: Garmin retired the Swim 2 in May 2025 and shipped no successor, folding swim tracking into the Forerunner and fenix lines instead. The practical effect is that swimmers now buy a running or multisport watch and use its swim profile. [src8]
- Head- and arm-mounted sensors are the real accuracy story: FORM's Smart Swim 2 moved the optical HR sensor to the temple, and armband sensors like the Polar Verity Sense clip to a goggle strap. Both sidestep the wrist-flexion problem that makes watch-based underwater HR unreliable. [src1, src9]
- Subscriptions arrive in swim tracking: Garmin Connect+ ($6.99/month, $69.99/year), Fitbit Premium ($9.99/month, $79.99/year) and FORM Premium ($9.99/month, $119/year) all launched or expanded paid tiers. On all three, core swim metrics — lengths, pace, SWOLF, stroke type, HR — remain free; the paid tiers buy coaching, guided workouts and analytics. COROS, Polar and Samsung charge nothing. [src9]
- A no-subscription budget tier is emerging: Google's screenless Fitbit Air ($99, 5ATM) tracks swims with no display and no mandatory membership. It is not a lap-swimming watch — you cannot read anything mid-set — but it marks the floor of the swim-capable market. [src2, src6]
- 10ATM and dive ratings keep expanding: Garmin fenix 8, Amazfit T-Rex Ultra 2 and Apple Watch Ultra 3 all cover recreational dive depths, blurring the line between swim watches and dive computers. [src10, src4, src5]
- Battery life gap widening: COROS PACE 3 (17 days), Amazfit T-Rex Ultra 2 (30 days) and Garmin fenix 8 (29 days) dramatically outpace Apple (42h) and Samsung (40h). For multi-day open-water events, this matters. [src1, src6]
Important Caveats
- Prices are approximate US street prices checked on 2026-08-09 and are for the exact configuration listed (case size, band size, and GPS versus GPS+Cellular are separate listings at different prices — a 49mm cellular Apple Watch and a 40mm GPS model are not interchangeable). Regional pricing and sales vary significantly.
- This is not medical advice, and none of these devices is a diagnostic tool. Only specific Apple models carry FDA clearances (ECG, AFib History, hypertension notifications); no device here detects or rules out any medical condition, and readings should never be used to diagnose. See a clinician for chest pain, breathlessness or persistent symptoms.
- Water rating terminology is routinely misused. IPX7 means splash and brief immersion only and is never safe for swimming. 5ATM/WR50 covers pool swimming. 10ATM/WR100 covers surface water sports. EN13319 (fenix 8, Apple Watch Ultra 3) is the dive-accessory standard required for depth-gauge use. Ratings assume factory-sealed condition — damage, battery replacement or band changes can compromise seals.
- Recurring costs: Garmin Connect+ is $6.99/month or $69.99/year; Fitbit Premium is $9.99/month or $79.99/year (the Charge 6 ships with a 3-month trial); FORM Premium is $9.99/month or $119/year after a 1-month trial. Every one of those is optional — lengths, pace, stroke type, SWOLF and heart rate are free on all three platforms. COROS, Polar, Samsung and Amazfit charge nothing. Apple Fitness+ ($9.99/month) is not required for swim tracking.
- The Garmin Swim 2 was retired by Garmin in May 2025 and has no successor; it is no longer stocked new by Garmin, and any remaining Amazon listings are third-party. It has been removed from the buy links on this card. Existing Swim 2 units still function normally. Use the Forerunner 265 (feature-for-feature equivalent) or the Forerunner 165 (budget). [src8]
- The Apple Watch Ultra 2, Apple Watch SE (2nd Gen) and Polar Ignite 3 were dropped from this card in August 2026. All three are end-of-life, and remaining Amazon stock is priced at or above the current-generation model that replaced them (Ultra 2 was $782 against the Ultra 3's $700).
- SWOLF (Swim + Golf) is time per length plus stroke count. Lower is better, and it is only meaningful within a consistent pool length. On the Forerunner 165 it is reported in pool mode only.
- Underwater optical HR accuracy drops sharply above 140bpm and during strokes with significant wrist flexion (breaststroke, butterfly). For training-zone accuracy, use a goggle-strap or armband sensor (Polar Verity Sense), the FORM temple sensor, or a swim-rated chest strap.
- Open water GPS accuracy depends on satellite acquisition during arm recovery — GPS does not work submerged. Expect 3-8% distance variance versus pool-measured distances, and worse on single-band watches like the Forerunner 165.