This privacy policy describes how Oikakeru (the “app”) and its supporting backend (the “API”) handle data. The app is operated by jaamdev as an independent developer (the “developer”).
Oikakeru does not require an account. No email, username, password, phone number, name, age, or any other identifying information is requested or collected.
Your tracked anime/manga library, progress, scores, reviews, notification schedules, achievements, and settings are stored exclusively in the local SQLite database on your device. The developer does not have access to this data. Cached cover images may also be stored on the device.
You may export your full profile to a JSON file at any time. The file is generated locally on your device and shared via the Android system share sheet to a destination of your choice. The developer never receives or stores this file.
When you search for an anime/manga, open its detail screen, or check for app updates, the app sends a request to the API. Those requests may include:
The API stores a daily visit counter used only for aggregated usage statistics in the admin panel. The stored value is a SHA-256 hash of your IP plus a server-side salt (not the IP in clear text). Rows are kept for 180 days and then deleted automatically. Under GDPR this hash is pseudonymous personal data: the developer cannot identify you from it alone, but it is not “no personal data”.
Cloudflare may also retain operational request logs (URL path, status, approximate location derived from IP) according to Cloudflare’s own retention. Search query strings can appear in those logs.
Rate-limit counters keyed by IP are kept for at most 24 hours.
The API enriches anime/manga metadata using the following public sources, called from the server:
In addition, when the app cannot find a title already stored on the API, it may call AniList (graphql.anilist.co) and Jikan (api.jikan.moe) directly from your device. Those third parties then see your IP address, user-agent, and the search or identifier you requested, under their own privacy policies. The developer does not control that processing.
Notifications you configure (e.g., “alert me when a new chapter releases”) are scheduled and delivered locally by your device. No notification data leaves your device.
Oikakeru is not directed at children under 13. The app does not collect personal data from any user.
Your library, scores, notes, and reviews live only on your device. Uninstalling the app or clearing its storage deletes that local copy. The developer cannot access or restore it.
The only data the developer stores about your use of the API is the hashed daily visit described in section 4, plus whatever Cloudflare retains as platform logs. There is no account to download. To request deletion of visit hashes associated with your current IP, contact the developer (section 11). Rotating the server salt also makes historical hashes unlinkable.
All API traffic uses HTTPS (TLS 1.3). Local on-device data is protected by Android’s app sandbox.
If this policy changes, the new version will be published at the same URL with an updated effective date.
For privacy-related inquiries, please open an issue on the public Oikakeru issue tracker.