Sibyl Folio — Privacy Policy

Effective: November 14, 2026

Sibyl Folio is a local-first reading and research app. The short version: the developer does not collect, store, see, or sell your data. The specifics follow.

Your library and settings

Your issues, saved articles, reading state, and preferences are stored locally on your device and synced only through your own iCloud account, using Apple's CloudKit private database. This information stays within your personal iCloud. The developer operates no servers that receive or store it and has no way to access it.

Your API key

Sibyl Folio uses your own Anthropic API key ("bring your own key"). Your key is stored in Apple's Keychain on your device and is used only to make requests directly to Anthropic. It is never transmitted to the developer.

AI features

When you use features powered by Anthropic, the content those features process — such as article text and the prompts you create — is sent directly to Anthropic under your API key. That processing is governed by Anthropic's Privacy Policy and terms.

Reading articles

To display full article content, Sibyl Folio may fetch it over the internet from the article's original source. Those requests go to that source's own website.

What Sibyl Folio does not do

• No analytics or usage tracking.
• No advertising and no advertising identifiers.
• No third-party data-collection SDKs.
• No developer-operated backend that stores your content.

Changes

If this policy changes, the updated version will be posted on this page with a new date above.

Contact

Questions about this policy can be directed to: morganbeatty@gmail.com