Loggnit and Apple Health: Two-Way Sync
What Loggnit writes to Apple Health, what it reads back, why it is opt-in, and how to avoid double-counting workouts.
Updated August 2026
Quick answer
Loggnit writes Lift and Exercise entries as workouts and food entries as nutrition, so your Activity rings stay accurate. It reads weight, height, biological sex, and birth year to fill in body metrics without manual entry. It is opt-in — toggle it on under Settings → Apple Health — and nothing moves in either direction until you do.
What moves, and which way
| Data | Direction | Why |
|---|---|---|
| Lift and Exercise entries | Loggnit → Health | Recorded as workouts, so Activity rings and trends include them |
| Food entries | Loggnit → Health | Nutrition data lands where other apps can read it |
| Weight and height | Health → Loggnit | Personalises calorie math without re-typing |
| Biological sex, birth year | Health → Loggnit | Same — inputs to the estimate, entered once |
The split is deliberate. Loggnit writes what it is the source of — the entries you make — and reads what the phone already knows about you.
Why it is opt-in
Health data is among the most sensitive on the device, so the integration stays off until you turn it on, and iOS asks separately about each data type. You can grant reading without writing, or writing without reading, and change your mind later in the Health app.
Worth knowing: iOS permission for Health is granular and one-directional. Granting read access does not grant write access, and revoking one leaves the other in place — so if sync looks half-broken, that asymmetry is the first thing to check.
Avoiding double-counted workouts
The one thing to watch for: if a workout is already recorded by another source — an Apple Watch, a running app, a gym platform — and you also log it in Loggnit, Health ends up with two records of one session.
The clean approach is to decide, per activity type, which app is the source of truth. Many people let the Watch own anything it detects automatically and use Loggnit for what the Watch cannot see: lifts with real per-set detail, meals, and the non-physical categories like Deep Work or Reading.
Common questions
Do I need Apple Health for Loggnit to work?
No. Everything works without it — entries live on the device and sync through your private iCloud. Health is an integration, not a dependency.
Will it import my existing Health history?
The read side is scoped to body metrics — weight, height, biological sex, birth year — so it fills in the numbers that personalise calorie math rather than importing past workouts.
Can I turn off just one direction?
Yes. iOS permissions for Health are per-type and per-direction, so you can allow Loggnit to write workouts without letting it read your body metrics, or the reverse. Manage it in the Health app under Sources.
Does iCloud sync mean my data goes to Epiqara?
No. Entries sync through your own private iCloud between your devices — start on iPhone, continue on iPad. Epiqara has no server holding your log.
Related guides
Get Loggnit
AI Calorie & Life Log · Free on the App Store.
