Titan builds every score from Apple Health, so the first thing it asks for is Health access. This article lists each data type in the request, the Titan feature it feeds, why the sheet also asks to write data, and how to change your answers later.
01When Titan asks
The request appears on the Health Access step of setup when you tap Enable HealthKit. iOS shows one sheet with a switch for every type. Titan asks once. After that, iOS keeps your choices and Titan cannot show the sheet again.
iOS never tells an app which read types you turned off. A type you declined looks the same to Titan as a type with no data. A blank score usually means a switch is off or no device recorded that data.
02What Titan reads and what it powers
The names below match the labels on the iOS permission sheet.
| Health data type | What it powers in Titan |
|---|---|
| Heart Rate Variability, Resting Heart Rate | Recovery, Stress, Vitals, and your baselines |
| Heartbeat Series | Recovery when Use RMSSD for HRV is on |
| Mindful Minutes | Finds the morning Mindfulness HRV that Recovery prefers |
| Heart Rate | Exertion, heart rate zones, Stress, and training load |
| Sleep | Sleep score, sleep debt, and sleep consistency |
| Respiratory Rate, Blood Oxygen | Vitals and the Sleep score |
| Workouts | Workouts, Exertion, and training load |
| Cycling Cadence, Cycling Power, Running Power | Charts on a workout's detail screen |
| Walking + Running, Cycling, and Swimming Distance | Workout distance |
| Steps, Stand Hours | Steps and Titan Age |
| Active Energy, Resting Energy | Energy burned and Net Energy |
| Dietary Energy, Carbohydrates, Protein, Total Fat | Energy consumed and macros |
| Cardio Fitness | Titan Age and You > Your Fitness |
| Cardio Recovery | Titan Age |
| Weight, Height, Body Fat Percentage | Titan Age lean mass, BMI, and Body & Measurements |
| Walking Speed | You > Your Fitness |
| State of Mind | The Mood chart in Trends on iOS 18 and later |
| Date of Birth | Titan Age and your age-based maximum heart rate |
| Sex, Blood Type, Fitzpatrick Skin Type | You > Biological Details |
| Body Temperature, AFib History | Requested, but no score or screen uses them today |
Recovery, Sleep, and Exertion need only the first seven rows. The rest fill in Titan Age, Energy, and the You screen. You can turn off any type and the features that use other types keep working.
03Why Titan asks to write data
The sheet also has a section for data Titan can write to Health. Only the Oura connection writes. It is off until you connect Oura and turn on Write Oura data to HealthKit. Titan then copies your Oura sleep, HRV, heart rate, steps, active energy, mindful sessions, and workouts into Apple Health so every score can use them.
The write list also names weight, resting energy, and blood oxygen. Titan writes none of those today. Before each sync, Titan deletes only the Oura records it wrote earlier in that date range. It never changes data from your Apple Watch or other apps.
If you never connect Oura, you can turn off every write switch. Nothing in Titan changes. See Oura direct connection for setup.
04Why Titan needs your date of birth
Titan Age starts from your calendar age and adjusts it up or down with your weekly signals. Without a date of birth in Health, Titan Age cannot be calculated. Heart rate zones use 220 minus your age as a floor for your maximum heart rate. Without an age, Titan uses only the highest heart rate from your last 30 days. You can set a fixed number at Settings > Training & Heart Rate > Use Custom Max Heart Rate.
To add or fix your birth date, open the Health app, tap your profile picture, then Health Details. Titan keeps the date it read for up to seven days, so a corrected date can take that long to reach Titan Age.
05Changing access later
In Titan, tap the avatar on Today, then You > Settings > Health & Connected Apps > Health Permissions. That row opens the iOS Settings app. You can also go straight to the controls:
- Open the Health app.
- Tap your profile picture.
- Under Privacy, tap Apps, then Titan.
- Turn each type on or off.
The same list is at iOS Settings > Privacy & Security > Health > Titan. Changes apply the next time Titan reads Health. If a score stays blank after you allow a type, see health access needed. To choose which device supplies each metric, see data sources.
