Amazfit
Pick Amazfit if
- Daily-wear watch under a budget
- 24/7 stress is the metric you care about most
- You don't want a chest strap
Amazfit vs Polar
Amazfit reads 21/33 signals from a wrist-only consumer watch and adds 24/7 stress. Polar reads 18/33, brings chest-strap-grade HRV under hard intervals (with H10), the ANS Charge recovery model and training load.
Amazfit
21/33signals its devices cover
Zepp OS watch
vs
POLAR
18/33signals its devices cover
Sport watch / chest strap
QUICK VERDICT
If you train by HRV under hard intervals or follow Polar's recovery and training load model, the chest strap is more accurate than any wrist-optical signal Amazfit can produce — and Polar's signal count is higher overall. If you want a consumer-friendly daily-wear watch at half the price with 24/7 stress baked in, Amazfit is the simpler choice. The two don't overlap as much as the signal counts suggest.
COVERAGE BY CATEGORY
Where each brand actually wins
Per-category breakdown of health signals exposed by each vendor's developer API. The number is breadth, not quality.
SIGNAL BY SIGNAL
The full matrix
| Signal | Amazfit | Polar |
|---|---|---|
| Heart & Vitals | ||
| Resting HR | ✓ | ✓ |
| HRV | ✓ | ✓ |
| SpO2 | ✓ | ✓ |
| Respiratory Rate | ✓ | ✓ |
| Skin Temperature | ✓ | ✓ |
| Body Temperature | — | — |
| Blood Pressure | — | — |
| ECG recording | — | ✓ |
| AFib detection | — | — |
| Vascular age | — | — |
| Sleep | ||
| Sleep duration | ✓ | ✓ |
| Sleep stages | ✓ | ✓ |
| Sleep score | ✓ | ✓ |
| Sleep efficiency | — | ✓ |
| Sleep apnea index | — | — |
| Activity | ||
| Steps | ✓ | ✓ |
| Active minutes | ✓ | ✓ |
| Calories | ✓ | ✓ |
| Activities | ✓ | ✓ |
| Floors climbed | ✓ | — |
| Distance | ✓ | ✓ |
| Fitness & Recovery | ||
| VO2max | ✓ | ✓ |
| Training load | ✓ | ✓ |
| Recovery / Readiness | ✓ | ✓ |
| Body Battery | — | — |
| Stress (continuous) | ✓ | — |
| Cardiovascular age | — | — |
| Body Composition | ||
| Weight | — | — |
| Body fat % | ✓ | — |
| Muscle mass | ✓ | — |
| Hydration | ✓ | — |
| Bone mass | — | — |
| Visceral fat | — | — |
Verified against vendor developer documentation and MyBodyAI backend code. This counts what a brand's API exposes, which is not the same question as what one device measures: the device catalog scores each model's own hardware, so its numbers differ.
Current Amazfit models Amazfit Active 3 Premium (2026), Amazfit Balance 3 (2026), Amazfit Balance Ultra (2026), Amazfit Bip Max (2026), all 17 Amazfit devices
Current Polar models Street X (2026), Grit X2 (2025), Loop (2025), Grit X2 Pro (2024), all 11 Polar devices
WHICH ONE FOR YOU
Pick the one that matches your priority
POLAR
Pick Polar if
- You train by HRV under hard intervals
- Chest strap during structured sessions is acceptable
- Recovery (ANS Charge) and training load drive your week
Amazfit+POLAR
Pick both if
- Polar H10 chest strap for structured sessions
- Amazfit for daily wear and 24/7 stress baseline
- Only the Polar half reaches MyBodyAI today; Amazfit has no integration yet
FAQ
Frequently asked questions
Should I choose Amazfit or Polar?
For most people it is one or the other. Both are daily-wear devices that track the same core things, heart rate, sleep and activity, so wearing both is redundant. Use the matrix above to pick the one that wins the categories you care about.
Which one tracks more health signals?
Amazfit tracks 21 of the 33 signals I compare, Polar tracks 18. The matrix above breaks it down by category, and they often win different categories.
Is it worth switching from Amazfit to Polar?
Only if Polar wins the categories you actually care about. If you already own Amazfit and it covers your main goal, the upgrade is rarely worth it. The matrix above shows exactly what changes.
How did you compare Amazfit and Polar?
From each brand's official spec sheets and support pages, cross-checked against independent hands-on reviews (DC Rainmaker, the5krunner, Tom's Guide). Signal-level edge cases are noted in the matrix, not hidden behind a single check mark.
WHERE TO BUY
Check prices at the source
Links to each vendor's store. None of them changed any pick above.
MORE COMPARISONS
Explore other pairs
OPTIONAL — IF YOU WANT MORE
Want one place that merges both feeds?
MyBodyAI is what I build with these signals — it pulls from any combination of the brands above and derives Biological Age and 12 health indices from the raw numbers. Free to try, no card. It's optional — the comparison above stands on its own.
Start your 7-day trial →