Pick Amazfit if
- Budget daily-wear watch with 24/7 stress
- You don't already own a scale
- Long battery on a consumer watch matters
Amazfit reads 15/27 signals from the wrist — heart, sleep, activity, 24/7 stress. Withings reads 19/27 from a clinical scale, BP monitor, and watch — body composition, blood pressure, sleep apnea screening, AFib, body temperature. Almost nothing overlaps.
These two are deeply complementary, not competitors. Amazfit covers the daily wrist signal stack — HR, HRV, sleep, 24/7 stress — at the lowest price in this comparison. Withings adds everything a watch can't physically measure: muscle mass, hydration, blood pressure, sleep apnea, ECG with AFib. Together they're the cheapest way to reach a really wide signal coverage in MyBodyAI.
Per-category breakdown of API signals.
| Signal | Amazfit | Withings |
|---|---|---|
| Heart & Vitals | ||
| Resting HR | ✓ | ✓ |
| HRV | ✓ | — |
| SpO2 | ✓ | ✓ |
| Respiratory Rate | ✓ | ✓ |
| Skin Temperature | — | ✓ |
| Body Temperature | — | ✓ |
| Blood Pressure | — | ✓ |
| ECG · AFib | — | ✓ |
| Sleep | ||
| Sleep duration | ✓ | ✓ |
| Sleep stages | ✓ | ✓ |
| Sleep score | ✓ | ✓ |
| 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 | — | ✓ |
Verified against vendor developer documentation.
Pick Amazfit if
Pick Withings if
Pick both if
Yes. MyBodyAI merges signals from every connected source and uses richer-source-wins per field. Amazfit is built, waiting for vendor app approval, Withings is live via OAuth.
Amazfit reads 15 of 27 tracked signals. Withings reads 19. The matrix above breaks the count down by category — they often win different categories.
No. Recommendations on this page come from signal coverage and developer-API capability. Affiliate commissions never change the matrix, the pick-X-if cards, or your MyBodyAI subscription price.
Your MyBodyAI history is preserved per signal. New data starts arriving from Withings the moment you connect it. Disconnecting Amazfit pauses the old feed without deleting past data.
Direct links to each vendor's store. Some are affiliate.
MyBodyAI merges these signals into Biological Age, Recovery and 9 other indices.
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