Amazfit
Pick Amazfit if
- Price is the binding constraint
- You like long battery on a consumer watch
- 24/7 stress index matters to you
Amazfit vs Fitbit
Both are consumer-grade daily-wear watches. Amazfit reads 21/33 signals at the lowest price point in this comparison and carries 24/7 stress across its whole lineup, where Fitbit keeps it for the models with the body-response sensor (Sense 2, Pixel Watch). Fitbit reads 22/33, adds ECG with AFib screening and works inside Google ecosystem (Pixel Watch, Google Maps, Google Wallet).
Amazfit
21/33signals its devices cover
Zepp OS watch
vs
fitbit
22/33signals its devices cover
Daily-wear watch + scale
QUICK VERDICT
If price is the binding constraint, Amazfit gives you most of the daily-health signal stack at a fraction of Fitbit's cost. If you're already in the Google ecosystem or want ECG with AFib screening on the wrist, Fitbit is the better fit. Neither watch measures body composition — Fitbit's brand row shows body fat only because of its discontinued Aria 2 scale, so for body fat and muscle mass you would pair either watch with a scale.
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 | Fitbit |
|---|---|---|
| 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 | — | ✓ via Fitbit Aria Air |
| 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 Fitbit models Google Fitbit Air (2026), Google Pixel Watch 4 (2025), Google Pixel Watch 3 (2024), Fitbit Charge 6 (2023), all 8 Fitbit devices
WHICH ONE FOR YOU
Pick the one that matches your priority
fitbit
Pick Fitbit if
- You're already in the Google ecosystem
- ECG + AFib screening matter on the wrist
- You want weight + BMI from the Fitbit Aria Air scale
Amazfit+fitbit
Pick both if
- Amazfit on the wrist 24/7 for stress + sleep
- Withings scale for body composition
- Lowest-cost multi-device combination in this comparison
FAQ
Frequently asked questions
Should I choose Amazfit or Fitbit?
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, Fitbit tracks 22. The matrix above breaks it down by category, and they often win different categories.
Is it worth switching from Amazfit to Fitbit?
Only if Fitbit 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 Fitbit?
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.
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