Two different philosophies: Fitbit offers affordable all-day activity tracking with basic HRV; Oura Ring 4 focuses on sleep and recovery with premium insights and best-in-class PPG accuracy.
Comparison Overview
| Category | Fitbit Sense 2 / Charge 6 | Oura Ring 4 |
|---|---|---|
| HRV Accuracy | Good PPG from wrist | Best-in-class PPG (2025 study) ✓ |
| Oura's finger sensors are more accurate | ||
| HRV Analysis | Basic HRV, Readiness Score (Premium) | Detailed HRV trends, Readiness contributors ✓ |
| Oura provides deeper HRV insights | ||
| Sleep Tracking | Good with Premium features | Excellent—designed for sleep ✓ |
| Ring form factor excels at night | ||
| Activity Tracking | All-day activity, workouts, GPS (select models) ✓ | Basic activity only |
| Fitbit is better for daytime tracking | ||
| Form Factor | Visible watch/band | Discreet all-titanium ring |
| Personal preference | ||
| Price Model | $100-330 + $10/month Premium ✓ | $350-500 + optional $6/month |
| Fitbit has lower entry point | ||
| Battery Life | 4-7 days | 7-8 days ✓ |
| Oura Ring 4 improved battery | ||
| Ecosystem | Google/Fitbit ecosystem | Oura only |
| Both have limited export options | ||
The Bottom Line
Choose Fitbit if you want affordable all-day activity tracking with basic HRV features and don't need deep recovery insights. Choose Oura Ring 4 if sleep and recovery optimization are your priority, you want the best HRV accuracy, and you prefer wearing something invisible that excels at overnight metrics.
Detailed Reviews
Fitbit Sense 2 / Charge 6
Good for general fitness users who want HRV as part of broader health tracking. The Premium subscription unlocks the...
Full reviewOura Ring 4
Best for those who prioritize comfort and discretion. The ring form factor is ideal for sleep tracking, though the...
Full review