Privacy Policy

Last updated 1 November 2026 · Suomeksi

Kide is a flashcard app. It works fully on your device without an account. If you create an account, Kide syncs your decks between your devices, and you can connect AI assistants to it. This policy explains what that involves.

Without an account

Your decks, cards, review history and images stay on your device. Nothing is sent to us.

With an account

To sync, Kide stores on its server:

• Your account: your email address and name, and your password (stored only as a salted hash). If you use Sign in with Apple, we receive the email Apple shares with us, which may be a private relay address.
• Your study data: your decks, cards, templates, tags, review history and settings, and the images and audio you add to cards.
• Device information: a random identifier for each device you sync, so changes from different devices can be merged.
• Connected AI assistants: if you connect an assistant (such as Claude or ChatGPT) to your account, which assistant it is, what you allowed it to do and when it last used that access.

This data is used only to provide sync and the features you use. It is not end-to-end encrypted: the server can read it so that AI assistants you connect can work with your cards.

AI assistants and connectors

You can connect AI assistants to Kide through its MCP server (see Use Kide with AI). When you do:

• The assistant can only use Kide after you sign in and approve it, and only with the permissions you choose. You can change or revoke its access at any time in Settings → Connected Agents.
• Kide receives only what the assistant sends in each tool call, such as the text of cards it creates or the deck it asks about, and returns only the data that call needs. Kide never receives your conversation, your chat history, your assistant's memory, your other connectors or your files.
• Changes an assistant makes are stored like your own edits and marked with the assistant's name.
• What the assistant does with the data Kide returns is governed by that assistant's provider and its privacy policy.

What we don't do

• No advertising and no tracking. Kide contains no analytics or advertising code.
• We don't sell or share your data with anyone, and we don't use it to train AI models.

Where it's stored

Kide runs on Cloudflare (Workers, D1 and R2), which processes the data on our behalf. Data is encrypted in transit and at rest. Server logs that record requests are kept for a short time for operations and security.

Deleting your data

You can delete your account in the app: Settings → Delete Account. This deletes your account and all of your synced data, including images, from the server, revokes every connected assistant and revokes Sign in with Apple. Nightly backups are kept for 14 days and then removed, so deleted data is gone from backups within 14 days. You can also choose to keep or erase the copy on your device.

Children

Kide is not directed at children under 13 and we don't knowingly collect their data.

Changes

If this policy changes, the date above changes with it. Significant changes will be mentioned in the app.

Contact

Questions or requests: dw@danielwargh.com.