VitalTrends is currently the only dashboard that lets you view WHOOP and Apple Health data on the same timeline. After connecting both sources — WHOOP via OAuth and Apple Health via the iOS companion app — your recovery scores, HRV, sleep stages, steps, and heart rate data appear together in synchronized charts. This makes it easy to see how your Apple Watch's step count tracks with your WHOOP strain score, or whether your WHOOP recovery score correlates with the sleep Apple Health recorded.
Why Each App Keeps to Itself
WHOOP and Apple Health are designed to be complete health platforms on their own. Neither is built to share a timeline with the other. Apple's Health app aggregates data from many sources, but it does not connect to WHOOP — and the WHOOP app does not read from Apple Health. The result is two parallel data streams that never intersect, even if you are wearing both a WHOOP and an Apple Watch simultaneously.
This is a real problem for people who use both. If your HRV drops, is it from yesterday's hard training (visible in WHOOP strain) or from the extra 15,000 steps your Apple Watch tracked? Without a unified view, you are left guessing.
What Overlapping the Two Data Sources Reveals
When you plot WHOOP and Apple Health data on the same timeline, some useful patterns become visible:
Strain vs steps: WHOOP strain and Apple Health active energy/steps measure different things — WHOOP strain is cardiovascular load, while Apple Health counts all movement including walking. Seeing both reveals whether your "low strain" days are actually low-activity days, or just lower-intensity movement.
Sleep comparison: WHOOP and Apple Watch both track sleep, but with different algorithms and sensors. Seeing both on the same night reveals where they agree and where they differ. Over time, you learn which source is more accurate for your sleep patterns.
HRV and heart rate together: WHOOP measures HRV during sleep; Apple Health captures heart rate throughout the day. Together, they give a more complete picture of cardiovascular status than either does alone.
Weight and recovery correlation: If you also connect Withings, you can see whether body weight changes (from a Withings scale) trend with changes in WHOOP recovery score — useful for understanding how training load affects composition over months.
How to Connect Both Sources
Connect WHOOP:
- Go to vitaltrends.net and create a free account
- Navigate to Settings → Connections
- Click Connect WHOOP and authorize in the OAuth screen
- VitalTrends pulls your full WHOOP history immediately
Connect Apple Health:
- Download the VitalTrends iOS companion app
- Sign in with your VitalTrends account
- Grant Apple Health read permissions when prompted
- The app uploads your Apple Health history and syncs automatically going forward
Both sources appear in the dashboard within minutes. Each chart has a source selector so you can toggle which data is displayed, or overlay them on the same axis.
What the Unified View Looks Like
The VitalTrends dashboard shows synchronized charts for each metric category. On the recovery page, you see your WHOOP recovery score alongside resting heart rate and HRV from both sources. On the sleep page, you can compare WHOOP sleep performance against Apple Health sleep duration for the same nights. On the activity page, WHOOP strain and Apple Health steps appear on the same timeline with shared date-range controls.
The charts use the same x-axis (date), so patterns that span both data sources are immediately visible. A 30-day view shows enough context for trends to emerge; a 90-day view is where seasonal patterns and training block effects become clear.
The Limitation to Know About
WHOOP uses a proprietary sensor and algorithm that is not visible to Apple Health. Apple Health does not receive WHOOP data, and VitalTrends does not attempt to merge or reconcile the two data streams. They remain separate sources displayed together — which is the honest way to handle data that comes from different measurement systems.
If your WHOOP and Apple Watch show different sleep durations for the same night, that is real. Neither is necessarily wrong — they are measuring slightly different things with different sensors. VitalTrends shows you both so you can make your own informed judgment.
