Last updated: January 1, 2026

We respect your privacy. This Privacy Policy explains how 21 Days Challenge (“we,” “our,” or “the App”) handles data.

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1. Information We Collect
	•	User Notes
Notes you add during the 21-day challenge are stored only on your device. We do not collect, transfer, or sell your notes.
	•	Progress Data
Your progress, completed days, streaks, and badges are stored locally on your device.
	•	AI Analysis (Optional Feature)
If you enable AI analysis, anonymized text may be sent to an AI service provider to generate summaries or suggestions.
No personal identifiers are included.
	•	No Photos or Media
The app does not collect or upload photos, contacts, or media files.

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2. How We Use Your Data
	•	To provide AI-based summaries and insights (optional).
	•	To display statistics, themes, and badges locally.
	•	To improve user experience within the app.

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3. Advertising

This app uses Google AdMob to display banner and interstitial advertisements.

AdMob may collect and process certain information such as:
	•	Device information
	•	Advertising identifiers
	•	Interaction data

This data may be used to show personalized or non-personalized ads, depending on your device settings and consent.

Users can opt out of personalized advertising through their device settings.

Remove Ads

Users who purchase the “Remove Ads” feature will no longer see any advertisements in the app.

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4. Data Storage & Security
	•	All personal data remains on your device unless explicitly stated.
	•	If AI features are used, data is transmitted over encrypted channels.
	•	We do not maintain our own servers for storing user content.

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5. Third-Party Services
	•	AI Service Providers (e.g., OpenAI):
Used only for processing anonymized text to generate AI responses.
	•	Google AdMob:
Used to serve advertisements. Data handling follows Google’s privacy policies.
	•	App Stores (Apple App Store / Google Play):
May collect crash reports and basic analytics according to their own policies.

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6. Changes to This Policy

We may update this Privacy Policy from time to time.
Any changes will be published at this location and reflected by the updated date above.

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7. Contact

If you have questions about this Privacy Policy, you may contact us via the app’s store listing.