Honest Comparison
Calio vs Polar
Both apps track your health — but Calio combines HRV science, AI nutrition, sleep intelligence, and coaching in one free platform.
Feature Comparison
| Feature | Calio | Polar |
|---|---|---|
| HRV Tracking | ✓ Yes | ✓ Yes |
| Resting Heart Rate | ✓ Yes | ✓ Yes |
| Recovery Score | ✓ Yes | ✓ Yes |
| Sleep Tracking | ✓ Yes | ✓ Yes |
| Training Load (ACWR) | ✓ Yes | ✓ Yes |
| Nutrition Tracking | ~ Limited | ✗ No |
| AI Daily Coach | ✓ Yes | ✗ No |
| Anomaly Detection | ✓ Yes | ✗ No |
| Personalized Baseline | ✓ Yes | ✓ Yes |
| Free Tier Available | ✓ Yes | ✗ No |
| Requires Hardware | ✗ No | ✓ Yes |
| iOS + Android | ✓ Yes | ✓ Yes |
Why Athletes Switch to Calio
Free to Start
No hardware subscription required. Download and start tracking today.
Unified Platform
HRV + Nutrition + Sleep + Training Load in one app — not separate subscriptions.
AI Coaching
Daily plan generated from your actual physiological data, not generic advice.