Privacy Policy
Last updated: August 18, 2026
Welcome to FormulaKit (the "App"), a LaTeX formula editor. This policy explains how we collect, use, and protect your information.
1. Information We Collect
The App does not collect or store any personally identifiable information. All of your data (including formula library, editing history, favorites, custom formulas, and settings) is stored locally on your device only (SwiftData) and is never uploaded to any server.
2. Purchases and Subscriptions
- The "Yearly Plan" auto-renewable subscription (priced in your local currency as shown in your App Store region) and the "Lifetime" one-time purchase are processed entirely by Apple (App Store).
- The App only learns the outcome of a transaction (e.g., whether you purchased or whether your subscription is active) in order to unlock Pro features. We cannot access or store your payment details (such as bank cards or Apple ID passwords).
- Manage your subscription (renewal, cancellation, refund) through official Apple channels: device "Settings → Apple ID → Subscriptions" or the App Store.
3. Network and Third-Party Services
- Formula rendering (KaTeX) resources are primarily bundled locally and do not rely on external services.
- The App contains no third-party analytics, advertising, or tracking SDKs, and does not share data with any third party.
- The App requests photo library "add-only" permission only when you use the "Save Image" feature (to save exported formula images; it cannot read your library contents). No camera, contacts, location, or other permissions are requested.
4. Data Sharing and Sale
We do not sell, rent, or share your personal information with any third party.
5. Children's Privacy
The App is not directed to children under 13, and we do not knowingly collect personal information from children.
6. Changes to This Policy
If this policy changes, we will post the updated version on this page and update the "Last updated" date above.
7. Contact Us
If you have any questions about this policy, please contact us at: