Privacy policy

Last updated October 19, 2026.

Kakera is a flashcard app for iPhone made by an independent developer. This policy explains what the app stores, where data goes when you use it, and what it never collects. In short: Kakera has no servers and no account, and collects nothing about you.

What the app stores

Your words and cards, your review history, daily stories and your settings are stored on your iPhone. If you are signed in to iCloud, your words, review history and stories are also kept in your own private iCloud database (Apple's CloudKit), so they appear on your other devices. That database belongs to your Apple Account: the developer cannot read it. Apple's handling of iCloud data is described in Apple's privacy policy.

The API key you enter for an AI provider is stored in the iPhone's Keychain. It is never sent anywhere except to that provider.

What leaves your iPhone, and when

• To the AI provider you choose (Anthropic for Claude, or OpenAI), only when you ask Kakera to write cards or a daily story: the words involved and the instructions for the card, sent with your own API key. The provider's own privacy policy and terms apply to that request. Without a key, nothing is sent.
• To Youdao's dictionary audio service (dict.youdao.com), to play a word's pronunciation: the text of the word or sentence being read. If it has no audio, your iPhone's built-in voice reads it instead, on the device.
• To iCloud, as described above, if you use iCloud.

Nothing else is sent.

What the app never collects

Kakera contains no analytics, no advertising, no tracking and no third-party SDKs. It does not collect your name, email address, location, contacts or device identifiers, and the developer receives no data from it.

Notifications

Review reminders are local notifications scheduled on your iPhone. No push server is involved, and you can turn them off in Settings at any time.

Diagnostics

Kakera keeps a short log on the device to help diagnose problems (Settings → Diagnostics). It is never sent automatically; it leaves the device only if you share it yourself.

Deleting your data

Delete words in the app, or delete the app to remove everything stored on the iPhone. To remove the iCloud copy, go to iOS Settings → your name → iCloud → Storage, and delete Kakera's data.

Children

Kakera does not knowingly collect any information from anyone, children included.

Changes and contact

If this policy changes, the new version will be posted here with a new date. Questions are welcome at developer@yanceyleo.com or on GitHub Issues.