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Each skill has a health score from 0% to 100% based on the Ebbinghaus forgetting curve. When you practice, the score increases. When you don't, it gradually decays. The decay rate adapts based on your actual performance — skills you answer quickly and correctly decay slower over time.

No. The app includes built-in AI (powered by Claude) that works out of the box with no setup required. If you prefer, you can add your own Claude, OpenAI, or Gemini API key in Settings for direct API calls without going through our proxy.

Anything you can learn. Programming languages, human languages, musical instruments, academic subjects, professional skills, hobbies — if you can practice it, you can track its decay and recovery.

Go to Settings → Subscription → Restore Purchases. Your Pro status will be restored using your Apple ID. If you have any issues, contact us at the email above.

No. All skill data, practice history, and settings are stored locally on your device. We don't have access to your personal data. See our Privacy Policy for full details.

Go to Settings → Delete All Data. This permanently removes all skills, practice history, and settings from your device. Alternatively, uninstalling the app removes all data automatically.

Subscriptions are managed by Apple. Go to iPhone Settings → Apple ID → Subscriptions → Skill Decay Tracker → Cancel Subscription. You'll keep Pro access until the end of the current billing period.

The app supports three AI providers: Claude (Anthropic), GPT-4o (OpenAI), and Gemini 2.0 Flash (Google). The built-in AI uses Claude via our proxy server. You can switch providers or use your own API key in Settings → AI Provider.