# What are the best smartwatches with heart rate monitor for advanced fitness tracking features? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the best smartwatches with heart rate monitor for advanced fitness tracking features?

## Products

### Garmin Venu X1 (Model Number 010-02980-00)
```yaml
product: garmin-venu-x1-model-number-010-02980-00
brand: Garmin
price_gbp: 406.03
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
screen_size: 2 in
battery_life: Up to 8 days
compatibility: Android, Apple iOS
water_resistance: 5 ATM
```

- **Price:** £406.03 [^1]
- **Summary:** The Garmin Venu X1 is a GPS fitness smartwatch with an AMOLED touchscreen and built-in multi-band GPS for training and navigation. It includes advanced health and training features such as HRV status, advanced sleep monitoring, and training readiness metrics. It's designed for people who want detailed wellness tracking plus smart notifications and long-enough smartwatch battery for everyday use.
- **Ideal For:** It suits advanced fitness tracking because it combines up to 8 days smartwatch battery with multi-band GPS and 24/7 health metrics like HRV status, advanced sleep monitoring, and training readiness, while also supporting smartphone compatibility.
- **Additional Sources:** [^2], [^3]

### Amazfit Active 3 Premium 45mm
```yaml
product: amazfit-active-3-premium-45mm
brand: Amazfit
price_gbp: 110.73
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
screen_size: 1.32in AMOLED
battery_life: Up to 12 days typical use; up to 7 days heavy use; up to 24 hours continuous GPS
gps_accuracy: Reliable for most steady runs; single-band GPS can cause occasional distance drift
compatibility: Android 7.0 and above; iOS 14.0 and above
water_resistance: 5 ATM
heart_rate_accuracy: Relatively accurate during steady workouts; accuracy declines during high-intensity intervals
```

- **Price:** £110.73 [^4]
- **Summary:** The Amazfit Active 3 Premium is a 45mm running-focused smartwatch with a sapphire-glass 1.32in AMOLED display, offline maps, structured Zepp Coach training plans, and advanced running metrics. Its long battery life and 5 ATM water resistance suit everyday wear and regular training, while its single-band GPS and heart-rate performance are better suited to recreational and entry-level runners than highly competitive athletes.
- **Ideal For:** It suits advanced fitness tracking needs through continuous heart-rate monitoring, VO2 Max, training load, running power, lactate threshold, posture, ground-contact metrics, offline maps, external heart-rate monitor support, and up to 24 hours of continuous GPS.
- **Additional Sources:** [^5]

### COROS COROS PACE Pro
```yaml
product: coros-coros-pace-pro
brand: COROS
price_gbp: 220.74
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
screen_size: 1.3 in
battery_life: 20 days daily use; 38 hours All-Systems GPS; 31 hours dual-frequency GPS
gps_accuracy: Precise All-Systems and dual-frequency GPS; typically accurate within 2-4 m in testing
compatibility: Bluetooth smartphones, ANT+ and Bluetooth sensors, Wi-Fi, COROS app, Strava and Apple Health
water_resistance: 5 ATM
heart_rate_accuracy: Generally accurate during steady efforts with occasional delays and errors during high-intensity intervals
```

- **Price:** £220.74 [^6]
- **Summary:** The COROS PACE Pro is a lightweight multisport GPS watch with a bright 1.3 in AMOLED display, offline maps, advanced training tools, optical heart-rate monitoring and dual-frequency GPS. Its long battery life suits runners, triathletes and other athletes who want detailed training data without frequent charging.
- **Ideal For:** It suits advanced fitness tracking because it combines wrist-based heart-rate monitoring, VO2 max, training load, recovery metrics, sleep tracking, 38-hour GPS battery life, dual-frequency GPS and structured workout tools.

### Garmin Forerunner 265 GPS Smartwatch 46 mm
```yaml
product: garmin-forerunner-265-gps-smartwatch-46-mm
brand: Garmin
price_gbp: 258.38
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
screen_size: 1.3 in
battery_life: Up to 13 days in smartwatch mode and up to 20 hours in GPS mode
gps_accuracy: Multi-band GNSS with SatIQ technology
compatibility: Android and Apple iOS
water_resistance: 5 ATM
heart_rate_accuracy: Generally accurate with negligible differences from a chest strap
```

- **Price:** £258.38 [^7]
- **Summary:** The Garmin Forerunner 265 is a 46 mm running smartwatch with a bright AMOLED touchscreen, multi-band GPS, wrist-based heart-rate monitoring, training readiness, recovery insights, music, and Garmin Pay. Its long battery life and advanced training metrics suit runners, triathletes, cyclists, and serious fitness users.
- **Ideal For:** It suits advanced fitness tracking because it combines generally accurate wrist-based heart-rate monitoring with multi-band GNSS, training readiness, HRV status, recovery insights, race planning, and more than 30 activity profiles.
- **Additional Sources:** [^8]

### Polar Polar Vantage M3
```yaml
product: polar-polar-vantage-m3
brand: Polar
price_gbp: 294.56
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
screen_size: 1.28 in
battery_life: Up to 30 hours in performance training mode; up to 70 hours in eco training mode; up to 7 days in smartwatch mode
gps_accuracy: Distance ±2%; average route accuracy 5 m with dual-frequency GPS
compatibility: Polar Flow app for Android and iOS; Bluetooth sensors; Strava, TrainingPeaks and Komoot; no ANT+
water_resistance: 50 m suitable for swimming
heart_rate_accuracy: Good overall accuracy
```

- **Price:** £294.56 [^9]
- **Summary:** The Polar Vantage M3 is a lightweight multisport smartwatch with an AMOLED touchscreen, dual-frequency GPS, offline maps, ECG, SpO2, sleep tracking and advanced training and recovery metrics. It suits runners, cyclists, swimmers, triathletes and fitness-focused users who want detailed performance data and long battery life rather than a broad app ecosystem.
- **Ideal For:** It suits advanced fitness tracking because it combines Gen 4 optical heart-rate monitoring, ECG, SpO2, dual-frequency GPS with 5 m average route accuracy, Training Load Pro, Recovery Pro, Running Power, offline maps and up to 30 hours of performance training battery life.

### Samsung Samsung Galaxy Watch 7
```yaml
product: samsung-samsung-galaxy-watch-7
brand: Samsung
price_gbp: 140.26
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
screen_size: 1.5 in for 44mm; 1.3 in for 40mm
battery_life: Up to 40 hours AOD off; up to 30 hours AOD on
gps_accuracy: Dual-frequency GPS using L1 and L5 satellite bands for precise tracking
compatibility: Android 11 or higher with more than 1.5GB of memory
water_resistance: 5ATM + IP68
heart_rate_accuracy: High precision heart rate tracking with improved motion filtering
```

- **Price:** £140.26 [^10]
- **Summary:** Samsung Galaxy Watch7 is an AI-powered smartwatch with advanced heart rate, sleep, workout and body-composition tracking. It suits Android users who want a lightweight everyday smartwatch with dual-frequency GPS and a bright Super AMOLED display.
- **Ideal For:** It suits advanced fitness tracking because it combines motion-filtered heart rate monitoring, dual-frequency L1 and L5 GPS, workout tracking, sleep analysis and Energy Score insights.

---
## References & Sources
[^1]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/garmin-venu-x1-gps-smartwatch-51-mm-fiber-reinforced-polymer-black-with-slate-titanium-caseback-2025/JXF9YF5FY4/sku/6635856
[^2]: EuroOptic, accessed 2026-09-13. https://www.eurooptic.com/garmin-venu-x1-black-slate-titanium-smartwatch-black-comfortfit-nylon-band-010-0
[^3]: The Home Depot, accessed 2026-09-13. https://www.homedepot.com/p/Garmin-Venu-X1-Fitness-GPS-Smartwatch-in-Slate-Black-1-6-in-x-0-3-in-010-02980-00/339433286
[^4]: Amazfit, accessed 2026-09-13. https://us.amazfit.com/products/active-3-premium
[^5]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/amazfit-active-3-premium-45mm-smartwatch-silver-2026/J3R85LLQGZ
[^6]: Running Warehouse, accessed 2026-09-13. https://www.runningwarehouse.com/COROS_PACE_Pro_GPS_Sport_Watch/descpage-CPACPR.html
[^7]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/garmin-forerunner-265-gps-smartwatch-46-mm-fiber-reinforced-polymer-black-2023/JXF9YF4J4X
[^8]: Lowe's, accessed 2026-09-13. https://www.lowes.com/pd/Garmin-Forerunner-265-Smart-Watch-with-Step-Counter-Heart-Rate-Monitor-and-Gps-Enabled/5015174385
[^9]: Watchard, accessed 2026-09-13. https://watchard.com/polar-725882066745-sport-watch
[^10]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/samsung-galaxy-watch7-aluminum-smartwatch-40mm-bt-cream-2024/J3ZYG2KQ89