# Which fitness tracker offers the best heart rate monitoring features? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which fitness tracker offers the best heart rate monitoring features?

## Products

### Polar H10 Heart Rate Monitor (chest strap)
```yaml
product: polar-h10-heart-rate-monitor-chest-strap
brand: Polar
price_gbp: 78.63
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
battery_life: Up to 400 hours
step_counter: null
sleep_tracking: null
calories_burned: null
activity_tracking: null
waterproof_rating: 30 m
heart_rate_monitor: true
```

- **Price:** £78.63 [^1]
- **Summary:** Polar H10 is a chest-strap ECG heart rate sensor offering high-accuracy heart rate data with Bluetooth and ANT+ connectivity, internal memory for one training session, and swim-safe 30 m water resistance. It suits athletes and swimmers who need precise heart-rate recording and multi-device pairing.
- **Additional Sources:** [^2]

### Apple Watch Series 11
```yaml
product: apple-watch-series-11
brand: Apple
price_gbp: 298.93
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
battery_life: Up to 24 hours
step_counter: Yes
sleep_tracking: Yes (sleep stages and sleep score)
calories_burned: Yes
activity_tracking: Yes (workouts, activity rings, automatic workout detection)
waterproof_rating: 50m
heart_rate_monitor: Yes (optical and electrical)
```

- **Price:** £298.93 [^3]
- **Summary:** The Apple Watch Series 11 offers advanced health sensors including optical and electrical heart sensors, blood oxygen, sleep-stage tracking, and comprehensive workout and activity features. It suits users who want a high-end smartwatch for fitness, health monitoring, and everyday connectivity.
- **Additional Sources:** [^4]

### WHOOP WHOOP 4.0
```yaml
product: whoop-whoop-4-0
brand: WHOOP
price_gbp: 179.06
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
battery_life: up to 5 days
step_counter: null
sleep_tracking: Yes (comprehensive sleep staging and sleep performance)
calories_burned: Yes (calories tracked)
activity_tracking: Yes (strain and activity detection; manual workout logging available)
waterproof_rating: water-resistant to approximately 32 feet for two hours
heart_rate_monitor: 24/7 optical heart rate sensor (collects data every second)
```

- **Price:** £179.06 [^5]
- **Summary:** WHOOP 4.0 is a screen-free wearable focused on continuous biometric monitoring: heart rate, HRV, sleep, strain, and recovery, delivered through the WHOOP app and a subscription. It suits athletes and users who want in-depth physiological insights and coaching rather than smartwatch features.

---
## References & Sources
[^1]: Polar, accessed 2026-06-09. https://www.polar.com/us-en/sensors/h10-heart-rate-sensor
[^2]: REI, accessed 2026-06-09. https://www.rei.com/product/163611/polar-h10-heart-rate-sensor-m-xxl-strap
[^3]: Apple Store, accessed 2026-06-09. https://www.apple.com/apple-watch-series-11/
[^4]: Target, accessed 2026-06-09. https://www.target.com/p/apple-watch-series-11-160-gps-160-42mm-160-rose-gold-aluminum-case-with-light-blush-sport-band-s-m/-/A-91122586
[^5]: WHOOP (official), accessed 2026-06-09. https://www.whoop.com/us/en/