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 |
|---|---|---|
| Fixture Watch 1Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 2Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 3Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 4Fixture Maker B | Validated | |
| Fixture Watch 5Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 6Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 7Fixture Maker C | Unvalidated | None yet |
| Fixture Watch 8Fixture Maker C | Unvalidated | None yet |
Heart rate in steady exercise
| Watch | Tier | Studies behind it |
|---|---|---|
| Fixture Watch 1Fixture Maker A | Validated | |
| Fixture Watch 2Fixture Maker A | LimitedEvidence carried over from an earlier model |
|
| Fixture Watch 3Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 4Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 5Fixture Maker B | Limited | |
| Fixture Watch 6Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 7Fixture Maker C | Unvalidated | None yet |
| Fixture Watch 8Fixture Maker C | Limited |
Heart rate in interval exercise
| Watch | Tier | Studies behind it |
|---|---|---|
| Fixture Watch 1Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 2Fixture Maker A | Contested | |
| Fixture Watch 3Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 4Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 5Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 6Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 7Fixture Maker C | Unvalidated | None yet |
| Fixture Watch 8Fixture Maker C | Unvalidated | None yet |
Step count
| Watch | Tier | Studies behind it |
|---|---|---|
| Fixture Watch 1Fixture Maker A | Limited | |
| Fixture Watch 2Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 3Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 4Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 5Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 6Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 7Fixture Maker C | Unvalidated | None yet |
| Fixture Watch 8Fixture Maker C | Unvalidated | None yet |
Energy expenditure
| Watch | Tier | Studies behind it |
|---|---|---|
| Fixture Watch 1Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 2Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 3Fixture Maker A | Limited | |
| Fixture Watch 4Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 5Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 6Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 7Fixture Maker C | Unvalidated | None yet |
| Fixture Watch 8Fixture Maker C | Unvalidated | None yet |
Sleep duration
| Watch | Tier | Studies behind it |
|---|---|---|
| Fixture Watch 1Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 2Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 3Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 4Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 5Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 6Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 7Fixture Maker C | Validated | |
| Fixture Watch 8Fixture Maker C | Unvalidated | None yet |
Sleep staging
| Watch | Tier | Studies behind it |
|---|---|---|
| Fixture Watch 1Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 2Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 3Fixture Maker A | Limited | |
| Fixture Watch 4Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 5Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 6Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 7Fixture Maker C | Unvalidated | None yet |
| Fixture Watch 8Fixture Maker C | Unvalidated | None yet |
VO2max estimate
| Watch | Tier | Studies behind it |
|---|---|---|
| Fixture Watch 1Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 2Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 3Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 4Fixture Maker B | Limited | |
| Fixture Watch 5Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 6Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 7Fixture Maker C | Unvalidated | None yet |
| Fixture Watch 8Fixture Maker C | Unvalidated | None yet |
GPS distance and pace
| Watch | Tier | Studies behind it |
|---|---|---|
| Fixture Watch 1Fixture Maker A | Limited | |
| Fixture Watch 2Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 3Fixture Maker A | Unvalidated | None yet |
| Fixture Watch 4Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 5Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 6Fixture Maker B | Unvalidated | None yet |
| Fixture Watch 7Fixture Maker C | Limited | |
| Fixture Watch 8Fixture Maker C | Unvalidated | None yet |