Holocene

Holocene reads a file you choose and writes what it contains into Apple Health on your device. Your health data is not sent anywhere. There is no account, no server, no analytics and no advertising.

Last updated 18 August 2026.

What Holocene does with health data

Reads the file you pick, paste, or type into the app.
Writes the readings you confirm into Apple Health, using the permission you grant.
Never reads your health record. Holocene asks only for permission to write. iOS requires every app that uses HealthKit to carry a read-purpose description; Holocene's says plainly that it does not read, and the permission sheet you see asks only to write. Recognising a reading it has already imported is done by Health itself, from a key attached to each sample — so the app has no reason to look at anything else, and does not.
Deletes only samples it wrote itself. iOS does not permit an app to delete another app's samples, so readings from other apps and devices are outside its reach.

Health data is never used for advertising, never sold, never shared with third parties, and never written to iCloud or any other remote storage.

What is stored on your device

An import log: the date of each import, the name of the file, how many readings of each type it held, and the identifiers needed to remove those readings again. The log holds no health values. It lives in the app's own container and is deleted when you delete the app.

Network

Holocene contains no networking code. It makes no requests, to us or to anyone else. There is nothing to opt out of because nothing is collected.

Permissions

Holocene asks for permission only to write, and only for the health types the file you are importing actually contains. A file of heart-rate readings will not prompt for anything else.

You can review or revoke this at any time in Settings › Health › Data Access & Devices › Holocene. Revoking write permission stops Holocene writing that type; it does not remove what was already written — use History in the app, or delete the samples in the Health app.

Children

Holocene is not directed at children under 13 and collects no personal information from anyone.

Changes

Material changes to this policy will be published on this page and noted in the app's release notes.

Contact

holocene@shaizi.fr