10 Best Sleep Trackers Ranked (2025): Oura Ring vs Whoop
- Annie Wouters
- Mar 13
- 4 min read
Updated: Apr 19
Sleep is a fundamental pillar of health, influencing everything from cognitive function to athletic performance. With the rise of wearable technology, tracking sleep has never been easier. Whether you want to optimize recovery, understand your sleep cycles, or address sleep disturbances, a sleep tracker can provide invaluable insights.
In this article, we rank the 10 best sleep trackers available today, assessing them based on accuracy, features, battery life, comfort, and value for money.
1. Oura Ring Gen 4 – Best Overall Sleep Tracker
The Oura Ring Gen 4 is widely regarded as the best sleep tracker available. It uses advanced sensors to track sleep stages, HRV (heart rate variability), and body temperature, providing detailed insights into sleep quality and recovery. Its lightweight design makes it one of the most comfortable trackers, but the lack of a screen means you must rely on the mobile app.
Our Ring Cost:
£349+
Highly accurate sleep tracking
Tracks HRV, SpO2, and body temperature trends
Lightweight and comfortable
Long battery life (4-7 days)
Expensive (£349+ and a £5.99/month subscription)
No screen for real-time data
2. Whoop 4.0 – Best for Athletes and Recovery Tracking
The Whoop 4.0 is a top-tier option for athletes who prioritize recovery. With its focus on HRV, strain, and sleep optimization, it provides detailed insights into how well your body is recovering from exercise. The lack of a screen means all data must be accessed through the mobile app.
Whoop Cost:
£229+
Detailed sleep and recovery analysis
Continuous heart rate monitoring
No need to charge – battery pack allows uninterrupted wear
Personalized insights based on HRV and strain levels
Subscription-based (£27/month or £229/year)
No screen for real-time tracking
3. Apple Watch Series 10 – Best for Apple Ecosystem Users
For Apple users, the Apple Watch Series 9 is an excellent choice. While its sleep tracking is not as advanced as Oura or Whoop, the watch offers a well-rounded experience with additional features like ECG monitoring, SpO2 tracking, and fitness tracking. However, its short battery life requires daily charging.
Apple Watch Cost:
£399+
Advanced sleep tracking with watchOS 9+ updates
Integrates seamlessly with Apple Health
Additional health monitoring features (ECG, SpO2, HRV)
Stylish and multi-functional
Poor battery life (~18-24 hours)
Not as detailed in sleep-stage tracking compared to Oura or Whoop
4. Fitbit Sense 2 – Best for Wellness and Stress Tracking
The Fitbit Sense 2 is an all-in-one health tracker with a strong emphasis on wellness. It provides a good balance between affordability and functionality, making it ideal for those looking to track sleep without breaking the bank.
Fitbit Cost:
£149.99+
Tracks sleep stages, SpO2, HRV, and skin temperature
Built-in stress tracking (EDA sensor)
Long battery life (6+ days)
Affordable compared to premium trackers
Subscription required for in-depth data (Fitbit Premium - £7.99/month)
Less detailed sleep tracking compared to Whoop/Oura
5. Garmin Venu 2 Plus – Best for Outdoor Enthusiasts
For those who lead an active lifestyle and want a comprehensive health and fitness tracker, the Garmin Venu 2 Plus is a fantastic option. Its detailed sleep tracking, combined with Pulse Ox and HRV features, offers solid insights into your sleep quality and overall health.
Garmin Venu 2 Cost:
£179.99+
Advanced sleep tracking with Pulse Ox and HRV monitoring
Long battery life (up to 11 days)
Excellent for fitness and outdoor activities
AMOLED display with great readability
Heavier and bulkier than some competitors
Lacks detailed recovery insights compared to Whoop
6. Withings ScanWatch – Best Hybrid Tracker for Sleep Apnea Detection
The Withings ScanWatch is the best option for users who want a sleep tracker with medical-grade health features. It is one of the few wearables capable of detecting sleep apnea risk, making it ideal for those concerned about respiratory health.
Withings ScanWatch Cost:
£279.99+
Detects signs of sleep apnea (SpO2 monitoring)
Stylish analog-digital hybrid design
Long battery life (30+ days)
Tracks HRV, breathing disturbances, and sleep cycles
Limited smartwatch functionality
Small screen for notifications
7. Polar Vantage V3 – Best for Serious Athletes
Polar’s Vantage V3 offers detailed sleep analysis with its Nightly Recharge feature, which assesses recovery and readiness for training. It’s a great choice for serious athletes looking for in-depth training insights.
Polar Vantage V3 Cost:
£295+
Advanced sleep tracking with Nightly Recharge feature
Tracks HRV, SpO2, and body temperature
Long battery life (up to 8 days)
Excellent for endurance athletes
Bulky design
No third-party app integrations
9. Xiaomi Smart Band 8 – Best Budget Sleep Tracker
For those on a budget, the Xiaomi Smart Band 8 offers excellent value. It tracks basic sleep metrics and is perfect for casual users who want an affordable way to monitor their sleep.
Polar Vantage V3 Cost:
£50+
Affordable (~£50)
Tracks sleep stages, SpO2, and heart rate
Lightweight and comfortable
14-day battery life
Less accurate than premium trackers
Limited ecosystem for deeper insights
Conclusion: Which Sleep Tracker is Right for You?
Choosing the best sleep tracker depends on your needs and budget.
If you want the most accurate and detailed sleep data, Oura Ring Gen 4 and Whoop 4.0 are the best choices. If you’re looking for an all-in-one smartwatch, the Apple Watch Series 10 or Fitbit Sense 2 provide solid sleep-tracking capabilities. Meanwhile, budget-conscious users will find value in the Xiaomi Smart Band 8.
Ultimately, the best sleep tracker is the one that fits your lifestyle and helps you optimize your sleep and overall health.
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