COROS vs Amazfit: VO2max compared
How COROS and Amazfit estimate your VO2max, what each needs from you, what else they show and what independent studies say about accuracy.
| COROS | Amazfit | |
|---|---|---|
| Called | VO2 Max | VO₂ Max |
| Algorithm | In-house EvoLab | Zepp Health PeakBeats workout status algorithm |
| App | COROS app | Zepp app |
| From: Outdoor run | Yes | Yes |
| From: Walk | Not confirmed | No |
| From: Treadmill | No | No |
| From: Bike (power meter) | Yes | No |
| From: Resting test | Not confirmed | No |
| From: All-day data | Not confirmed | No |
| Fitness age | Not confirmed | Not confirmed |
| Race predictor | Yes | Yes |
| Published accuracy studies | 0 | 0 |
| What you need to do | One continuous 25-minute outdoor run (Run or Track Run mode, no pauses) at or above 65% of heart rate reserve, then at least one such run every 90 days. Cycling: a steady 20+ minute ride with a power meter and heart rate. | Correct profile in the Zepp app, then an outdoor, trail or track run of at least 10 minutes with heart rate reaching 75% of max HR. |
Key differences
- COROS can estimate from bike (power meter); Amazfit can't.
- Both have 0 published accuracy studies that we found.
How each one works
COROS: Running VO2 max uses heart rate and pace from your recent outdoor runs. Since October 2026 there is also a cycling VO2 max from rides with power and heart rate data.
Amazfit: Uses your profile plus heart rate and speed (and elevation) from outdoor runs. Amazfit says it estimates best on flat runs at low altitude.
Which is better for VO2max?
For VO2max specifically, the best device is the one that sees your hardest efforts: if most of your training is outdoor running, both give an estimate (both use outdoor run). If you cycle with a power meter, walk more than you run, or want a resting test, check those rows above. Whichever you choose, compare the number with itself over time and with the norms for your age.
Accuracy studies
COROS
No published, peer-reviewed validation found.
Amazfit
No published, peer-reviewed validation found.
Frequently asked questions
Is COROS or Amazfit more accurate for VO2max?
Neither has published peer-reviewed validation that we found. Use either as a trend tracker, not a lab value.
Does COROS measure VO2max from outdoor run like Amazfit?
Yes: both estimate from outdoor run.
Which is better for VO2max: COROS or Amazfit?
Pick the one whose data sources match how you train: COROS uses outdoor run, bike (power meter); Amazfit uses outdoor run.
Built from official documentation (see each brand page for sources). Features vary by model and firmware. COROS and Amazfit are trademarks of their owners; VO2max Health is independent and not affiliated with either.