The register
Which watches have been tested, for what.
For each thing a watch measures, every watch we cover, its evidence tier and the studies behind it. Each study links to its source and date on the watch's page.
Tiers, from strongest: Validated Limited Contested Unvalidated. What each tier means, and how we grade studies.
Heart rate at rest
| Watch | Tier | Studies behind it |
|---|---|---|
| Amazfit Active 2Amazfit | Unvalidated | None yet |
| Amazfit Active 3 PremiumAmazfit | Unvalidated | None yet |
| Amazfit Active MaxAmazfit | Unvalidated | None yet |
| Amazfit Bip 6Amazfit | Unvalidated | None yet |
| Amazfit Bip MaxAmazfit | Unvalidated | None yet |
| Amazfit Cheetah 2 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex 3 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex Ultra 2Amazfit | Unvalidated | None yet |
| Google Pixel Watch 5Google | Unvalidated | None yet |
Heart rate in steady exercise
| Watch | Tier | Studies behind it |
|---|---|---|
| Amazfit Active 2Amazfit | Unvalidated | None yet |
| Amazfit Active 3 PremiumAmazfit | Unvalidated | None yet |
| Amazfit Active MaxAmazfit | Unvalidated | None yet |
| Amazfit Bip 6Amazfit | Unvalidated | None yet |
| Amazfit Bip MaxAmazfit | Unvalidated | None yet |
| Amazfit Cheetah 2 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex 3 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex Ultra 2Amazfit | Unvalidated | None yet |
| Google Pixel Watch 5Google | Unvalidated | None yet |
Heart rate in interval exercise
| Watch | Tier | Studies behind it |
|---|---|---|
| Amazfit Active 2Amazfit | Unvalidated | None yet |
| Amazfit Active 3 PremiumAmazfit | Unvalidated | None yet |
| Amazfit Active MaxAmazfit | Unvalidated | None yet |
| Amazfit Bip 6Amazfit | Unvalidated | None yet |
| Amazfit Bip MaxAmazfit | Unvalidated | None yet |
| Amazfit Cheetah 2 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex 3 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex Ultra 2Amazfit | Unvalidated | None yet |
| Google Pixel Watch 5Google | Unvalidated | None yet |
Step count
| Watch | Tier | Studies behind it |
|---|---|---|
| Amazfit Active 2Amazfit | Unvalidated | None yet |
| Amazfit Active 3 PremiumAmazfit | Unvalidated | None yet |
| Amazfit Active MaxAmazfit | Unvalidated | None yet |
| Amazfit Bip 6Amazfit | Unvalidated | None yet |
| Amazfit Bip MaxAmazfit | Unvalidated | None yet |
| Amazfit Cheetah 2 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex 3 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex Ultra 2Amazfit | Unvalidated | None yet |
| Google Pixel Watch 5Google | Unvalidated | None yet |
Energy expenditure
| Watch | Tier | Studies behind it |
|---|---|---|
| Amazfit Active 2Amazfit | Unvalidated | None yet |
| Amazfit Active 3 PremiumAmazfit | Unvalidated | None yet |
| Amazfit Active MaxAmazfit | Unvalidated | None yet |
| Amazfit Bip 6Amazfit | Unvalidated | None yet |
| Amazfit Bip MaxAmazfit | Unvalidated | None yet |
| Amazfit Cheetah 2 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex 3 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex Ultra 2Amazfit | Unvalidated | None yet |
| Google Pixel Watch 5Google | Unvalidated | None yet |
Sleep duration
| Watch | Tier | Studies behind it |
|---|---|---|
| Amazfit Active 2Amazfit | Unvalidated | None yet |
| Amazfit Active 3 PremiumAmazfit | Unvalidated | None yet |
| Amazfit Active MaxAmazfit | Unvalidated | None yet |
| Amazfit Bip 6Amazfit | Unvalidated | None yet |
| Amazfit Bip MaxAmazfit | Unvalidated | None yet |
| Amazfit Cheetah 2 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex 3 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex Ultra 2Amazfit | Unvalidated | None yet |
| Google Pixel Watch 5Google | Unvalidated | None yet |
Sleep staging
| Watch | Tier | Studies behind it |
|---|---|---|
| Amazfit Active 2Amazfit | Unvalidated | None yet |
| Amazfit Active 3 PremiumAmazfit | Unvalidated | None yet |
| Amazfit Active MaxAmazfit | Unvalidated | None yet |
| Amazfit Bip 6Amazfit | Unvalidated | None yet |
| Amazfit Bip MaxAmazfit | Unvalidated | None yet |
| Amazfit Cheetah 2 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex 3 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex Ultra 2Amazfit | Unvalidated | None yet |
| Google Pixel Watch 5Google | Unvalidated | None yet |
VO2max estimate
| Watch | Tier | Studies behind it |
|---|---|---|
| Amazfit Active 2Amazfit | Unvalidated | None yet |
| Amazfit Active 3 PremiumAmazfit | Unvalidated | None yet |
| Amazfit Active MaxAmazfit | Unvalidated | None yet |
| Amazfit Bip 6Amazfit | Unvalidated | None yet |
| Amazfit Bip MaxAmazfit | Unvalidated | None yet |
| Amazfit Cheetah 2 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex 3 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex Ultra 2Amazfit | Unvalidated | None yet |
| Google Pixel Watch 5Google | Unvalidated | None yet |
GPS distance and pace
| Watch | Tier | Studies behind it |
|---|---|---|
| Amazfit Active 2Amazfit | Unvalidated | None yet |
| Amazfit Active 3 PremiumAmazfit | Unvalidated | None yet |
| Amazfit Active MaxAmazfit | Unvalidated | None yet |
| Amazfit Bip 6Amazfit | Unvalidated | None yet |
| Amazfit Bip MaxAmazfit | Unvalidated | None yet |
| Amazfit Cheetah 2 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex 3 ProAmazfit | Unvalidated | None yet |
| Amazfit T-Rex Ultra 2Amazfit | Unvalidated | None yet |
| Google Pixel Watch 5Google | Unvalidated | None yet |