Titan builds its scores from the data your Apple Watch saves to Apple Health. Each watch signal feeds one or more Titan scores, and a few settings decide which device Titan trusts for each metric.
01Requirements
Titan runs on iPhone with iOS 26 or later. Your Apple Watch pairs with that iPhone and writes its readings to the Health app. Titan reads those readings through HealthKit. The Titan watch app is optional. It shows the results Titan on iPhone calculated, and its widget puts one of those scores in the Smart Stack or on a watch face.
The watch records steps, distance and active energy only when Fitness Tracking is on. Check it in iPhone Settings > Privacy & Security > Motion & Fitness.
02Which watch signals feed which score
| Titan score | Apple Watch signals Titan reads |
|---|---|
| Recovery | HRV and heart rate recorded during sleep |
| Stress | HRV, resting heart rate and heart rate through the day |
| Battery | Heart rate and HRV through the day, sleep stages and workouts |
| Sleep | Sleep duration and stages |
| Exertion | Heart rate, heart-rate zones and workouts |
| Net Energy | Active energy and resting energy |
| Titan Age | Steps, stand hours, zone minutes, strength workouts, sleep, resting heart rate, heart-rate recovery and VO2 max |
| Vitals | HRV, resting heart rate, respiratory rate and blood oxygen |
Stress and Battery compare your day with 60-day baselines of daily HRV and resting heart rate, so both need regular HRV and resting heart rate readings. A night with heart rate but no HRV still gets a Recovery score, marked Estimated.
By default Titan uses the HRV value Apple records, which is SDNN. Titan can compute RMSSD from beat-to-beat heartbeat series instead. Turn on Use RMSSD for HRV in Settings > Recovery & Sleep. Settings is reached from the avatar on Today, then You > Settings. RMSSD takes longer to load. When you switch methods, Titan rebuilds your Recovery history on its own.
Titan labels sleep stages Core, Deep and REM. If a night has no stages, Titan still scores Sleep from your time asleep.
Titan also asks for body temperature, AFib burden, running and cycling power, walking speed, distances, mindful minutes and State of Mind. It does not read ECG recordings, fall events, Cycle Tracking, or dive depth and water temperature.
03Wear the watch overnight
The watch records sleep stages, respiratory rate, blood oxygen and sleep HRV only while you wear it in bed. Charge it before bed so it lasts through the night. Turn on sleep tracking in the Health app under Browse > Sleep > Full Schedule & Options > Track Sleep with Apple Watch.
Recovery scores the night you just slept. It takes every HRV reading and every heart rate reading the watch saved during your main sleep session. Without a recorded sleep session, Titan reads 10 PM to 10 AM instead and marks the score Partial night. Titan reads one device per night and prefers the one that recorded your sleep.
A night's score becomes final at noon on the day you wake. Until then, readings that sync late can still update it.
04Grant Health access
Titan asks for Health access on the Connect Apple Health step of setup. Allow every category, since one denied type blanks the scores that need it. To review access later, open Settings > Health & Connected Apps > Health Permissions. That row opens Titan's page in the iPhone Settings app. You can also go to iPhone Settings > Privacy & Security > Health > Titan. Allow Heartbeat Series if you plan to use RMSSD. The Health permissions article lists every type.
05Choose sources inside Titan
Titan keeps its own source rules, separate from the data source order in the Health app. Open Settings > Health & Connected Apps. Below Health Permissions, the Apple Health card lists Sleep, Workouts, HRV, Resting Heart Rate, Heart Rate, Steps, Active Energy, Exercise Minutes, Stand Hours and Mindful Minutes. Each has these controls.
- Primary Source, set to Automatic or to one device or app.
- Allowed Sources, a toggle for each source seen in recent Apple Health samples.
- Duplicate Handling, set to Prefer Primary by default, or to Most Recent or Highest Quality.
- Reset to All Sources, which clears your choices for that metric.
Set Apple Watch as the primary source for HRV and resting heart rate if a ring or another app also writes those values.
Sleep has one more control. Settings > Recovery & Sleep > Sleep Tracker lists every app and device that has saved sleep to Apple Health, by name. Pick your Apple Watch unless another app such as AutoSleep or Pillow tracks your nights. Titan reads that source first and fills nights it missed from your other sources. The sleep source article explains the choice.
06When watch data does not appear
Open the Health app and confirm the reading exists there. If Health has it and Titan does not, check the permission for that type and pull down on Today to refresh. If older days look wrong, tap Run Full Resync in Settings > Health & Connected Apps. For missing HRV, see HRV not showing. If the Titan watch app shows older numbers than your iPhone, see Titan on Apple Watch is not updating.
