Apple Health.

What Kata reads#

Apple Health is read on iPhone only: the web app has no access to it. With your permission, Kata reads steps, active energy, distance, workouts, sleep, weight, heart rate, resting heart rate, HRV, respiratory rate, blood oxygen, VO2 max, height, body fat, lean mass, nutrition, water and wrist temperature, merged across your iPhone, an Apple Watch and the apps that write to Apple Health. The nutrition another app writes there counts toward your day only if you turn that on in Nutrition.

On Android, Kata reads Google Health Connect instead: see Health Connect.

Permissions stay with the OS#

You grant access in the iOS Health permission screen, not inside Kata, and iPhone keeps that permission itself: to withdraw it, open the Health app, tap your profile picture, then Apps, then Kata. Turning access off there stops the imports; nothing already in Kata is affected.

You can also disconnect inside Kata, under Connections. Kata stops reading Apple Health at once and lets you choose whether the Apple Health values already on this device leave with it or stay. Your own logged entries always stay.

How imports behave#

• Imported entries are tagged as coming from Health and deduplicated per day.
• Kata imports whenever you open it: a quick pass over the last two days, and about once an hour a fuller pass over the last week that also catches up on days it missed. The first connection reads the last 30 days.
• Your own logs are never overwritten. If you logged a workout by hand, the importer does not touch it.
• Edit an imported entry and it becomes yours; the importer then leaves that value alone for good.
• If an imported entry disappears upstream, Kata cleans it up within the sync window, without touching anything you entered.

Where the values go#

Apple Health values stay on your iPhone. When a question to Kata needs some of them, those values go with that question to our AI provider to write the answer. They are never stored on Kata's servers and never used for advertising, and they are left out of the backup file: after a restore, Kata brings the last 90 days back from Apple Health.