Privacy Policy

KanjiLens is an iOS camera app that recognizes printed Japanese on your device. We do not require accounts, do not collect personally identifiable information, and do not sell or share user data.

On-device data

The camera is used to recognize printed Japanese text. Camera frames are processed locally for optical character recognition and dictionary lookup, and camera access is used only while the app is open and scanning. Camera frames, photos, scanned text, and dictionary lookups are never sent to a server. Bookmarks you save stay on your device.

Anonymous usage analytics

KanjiLens uses PostHog to collect anonymous usage events that help us understand which features are useful and where the app falls short. Events are tied to a randomly generated installation identifier, not to your name, email, Apple ID, or any identifier you can be looked up by.

Examples of events we record: the scanner started, a definition was viewed, a bookmark was added or removed, onboarding completed, the torch was toggled, camera permission was denied. We do not record the text you scanned, the kanji you looked up, the contents of your bookmarks, or any photos from your library.

Crash and error reports

If the app crashes or hits an unexpected error, a symbolicated stack trace is uploaded to PostHog so the bug can be fixed. These reports include the app version, iOS version, device model, and stack trace. They do not include scanned text or personal information.

Third-party services

PostHog is the only third-party service KanjiLens uses. There are no advertising SDKs and no cloud OCR. PostHog's privacy policy is available at posthog.com/privacy.

Data sharing

We do not sell, rent, or share data collected by KanjiLens.

Changes to this policy

If this policy changes, the new effective date will appear at the top of this page.

Contact

For privacy questions, email kai@koilabs.io.