Best Swim Trackers and Watches 2026: Pool and Open Water

What is SWOLF?

SWOLF (swim + golf) is your stroke count for one pool length plus the time in seconds. A 25m length taking 30 seconds with 18 strokes gives a SWOLF of 48. Lower is better — it means you’re either swimming faster, taking fewer strokes, or both.

SWOLF is the best single number for tracking swimming efficiency over time. Unlike pace alone, it captures technique improvements: if your SWOLF drops from 52 to 46 over three months, your stroke is getting more efficient regardless of how hard you’re pushing.

Pool vs. Open Water

In the pool, watches count laps using an accelerometer — they detect the turn and change in direction. This works well for freestyle and backstroke, less reliably for breaststroke and butterfly where the wall touch is different. All watches let you set your pool length (25m, 50m, or custom).

In open water, GPS takes over. But your wrist is underwater during most of the stroke cycle, so the watch only gets a GPS fix when your hand exits the water. This creates zigzag tracks and overestimated distances. The best watches average the GPS signal to produce more accurate distance.

Quick Comparison

Editor’s Picks

Individual Reviews

Garmin Swim 2

The only swim-specific watch on the market. Pool tracking is best-in-class: it detects all four strokes, counts laps with near-perfect accuracy, and calculates SWOLF per length. Underwater optical heart rate works during swimming — not as accurate as a chest strap, but useful for zone estimation.

Open water mode uses GPS and tracks distance, pace, stroke count, and stroke rate. The watch is small and lightweight, designed to sit under a swim cap strap without catching water. Drill mode lets you manually log distance for kick sets and drill work that the accelerometer can’t auto-detect.

The limitation: it’s swim-only. No cycling or running metrics, no smart features. If you want a multi-sport watch, the Garmin Forerunner or COROS PACE do swimming well enough for most athletes.

Verdict: Best dedicated swim tracker. If you swim 4+ times a week and want the most accurate pool data, nothing else comes close.

COROS PACE 3

The best multi-sport value. Pool swimming mode detects strokes, counts laps, and reports SWOLF. The 30-gram weight is barely noticeable in the water. Accuracy is slightly behind the Garmin Swim 2 for breaststroke detection but excellent for freestyle.

No underwater heart rate — optical sensors don’t work submerged on the PACE 3. Open water GPS tracking is functional but the wrist-exit GPS issue creates slightly inflated distances. For triathletes, the PACE 3 covers all three sports in one affordable package.

Verdict: Best swim-capable multi-sport watch. Swim tracking is good (not perfect), but it also tracks cycling and running at an elite level for $229.

Polar Ignite 3

Polar’s optical heart rate works underwater better than most competitors — the Elixir sensor is designed for wet conditions. Pool tracking is reliable for freestyle and backstroke, less consistent for breaststroke. SWOLF, distance, pace, and stroke rate are all reported.

The Ignite 3 adds sleep tracking, Nightly Recharge recovery metrics, and FitSpark daily training suggestions. For swimmers who also want comprehensive recovery and wellness tracking, it’s a strong package. The AMOLED display is bright enough to read poolside between sets.

Verdict: Best underwater heart rate. Good for swimmers who want HR-based zone training in the pool without a chest strap.

Apple Watch Ultra 2

The Ultra 2 adds a depth gauge and water temperature sensor to its swimming capabilities. Pool tracking is decent: stroke detection works for freestyle and backstroke, less reliably for breaststroke. The Workout app shows pace, distance, and SWOLF in real time.

Underwater heart rate works but with caveats — accuracy drops during hard intervals. The real advantage is the Apple ecosystem: swim data syncs to Apple Health, which Strava and training platforms can read. If you already wear an Apple Watch daily, it’s a capable pool companion.

Verdict: Good swim tracking if you already own one. Not worth buying specifically for swimming at $799.

FORM Smart Goggles

The most innovative device here. A heads-up display (HUD) inside your goggle lens shows real-time metrics: split time, stroke rate, pace, and distance. You see your data without stopping or looking at your wrist. It’s like having a coach on your lens.

Pool tracking accuracy is excellent because the accelerometer sits on your head, not your wrist — it gets a cleaner signal during all stroke types. Pairs with a Garmin or COROS watch for open water GPS. Heart rate requires a separate paired strap (Polar OH1 or similar).

The downside: you’re locked into FORM’s goggle fit. If the goggles don’t suit your face shape, the tech is irrelevant. Multiple lens options (clear, tinted, mirrored) help. At $219, the price is competitive with a dedicated swim watch.

Verdict: Game-changer for competitive swimmers. Real-time HUD metrics transform pool sessions. Best swim-specific innovation in years.

What We’d Buy

Best pool tracker: Garmin Swim 2. Most accurate stroke detection, underwater HR, drill mode. The default for dedicated swimmers.

Most innovative: FORM Smart Goggles. In-goggle HUD changes how you train. Pairs with your existing watch for open water. Best for competitive and technique-focused swimmers.

Best multi-sport: COROS PACE 3. Good swim tracking + elite cycling/running for $229. The one-device solution for triathletes on a budget.

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