You can’t improve what you don’t measure. Sleep trackers give you real data about your sleep quality — deep sleep, REM sleep, heart rate, and more — so you can actually fix what’s wrong.
Here are the best sleep trackers under $100 on Amazon right now.
What Can Sleep Trackers Actually Measure?
Modern sleep trackers use accelerometers and heart rate sensors to estimate:
- Total sleep time
- Sleep stages: Light, deep, and REM sleep
- Sleep score: An overall rating of your night
- Heart rate variability (HRV): A key indicator of recovery
- Blood oxygen (SpO2): Can flag potential sleep apnea
- Restlessness: How much you move during the night
Note: Consumer sleep trackers are not medical devices. They’re good for tracking trends over time, but not as accurate as clinical sleep studies.
Best Sleep Trackers Under $100
1. Fitbit Inspire 3 – Best Overall
The Fitbit Inspire 3 is our top pick for most people. It tracks sleep stages, heart rate, blood oxygen, and gives you a daily Sleep Score. The companion app is excellent for spotting patterns over time.
Why we love it:
- Accurate sleep stage tracking
- Daily Sleep Score is easy to understand
- 10-day battery life
- Slim and comfortable to wear at night
- Syncs with Google Health
Best for: Most people who want reliable sleep tracking without breaking the bank.
2. Amazfit Band 7 – Best Value
The Amazfit Band 7 offers impressive features at a very affordable price. It tracks sleep stages, blood oxygen, heart rate, and stress — and has an 18-day battery life.
Why we love it:
- Exceptional battery life
- Built-in Alexa
- Large, bright display
- Very affordable
Best for: Budget-conscious buyers who want maximum features per dollar.
3. Garmin Vivosmart 5 – Best for Athletes
If you take fitness seriously, the Garmin Vivosmart 5 offers the most advanced sleep and recovery metrics in this price range. It tracks Body Battery — an energy measurement that combines sleep quality, HRV, and activity.
Why we love it:
- Advanced HRV and Body Battery tracking
- Excellent Garmin app ecosystem
- Accurate sleep stage detection
- Slim design
Best for: Athletes and fitness enthusiasts who want to optimize recovery.
4. Xiaomi Smart Band 10 – Best Budget Pick
The Xiaomi Smart Band 10 is the 2025 version with a 1.72″ AMOLED display and 21-day battery life. Tracks sleep stages, heart rate, blood oxygen, and stress at an unbeatable price.
Why we love it:
- Extremely affordable
- Good battery life
- Comfortable for sleep
- Reliable basic tracking
Best for: First-time sleep tracker buyers who want to try tracking without a big investment.
How to Get the Most Out of Your Sleep Tracker
- Wear it consistently: Data is most useful when compared over weeks and months
- Look for trends, not single nights: One bad night doesn’t mean anything
- Focus on deep sleep and HRV: These are the most meaningful metrics
- Combine with lifestyle changes: A tracker tells you what’s wrong — you still have to fix it
Which Sleep Tracker Should You Buy?
- Best overall: Fitbit Inspire 3
- Best value: Amazfit Band 7
- Best for athletes: Garmin Vivosmart 5
- Best budget: Xiaomi Smart Band 8
The Bottom Line
Any of these trackers will give you valuable insights into your sleep. Start with the Fitbit Inspire 3 if you want the best all-around experience, or the Amazfit Band 7 if you want maximum value.
The best tracker is the one you’ll actually wear every night.
Which sleep tracker do you use? Share your experience in the comments.