Introduction
This policy applies to One Line, published by Maxime Manseau. For privacy questions, email max.manseau01@gmail.com.
This page complements the Terms of Service and describes the categories of data used depending on the features you choose.
1. Data stored locally
One Line stores some data in the browser or installed app to run the game, including:
- your local username and an anonymous local identifier;
- your level progress, completed solutions, best results and Daily Challenge progress;
- custom levels, unlocked packs, hints and preferences;
- pending sync events when the network is unavailable.
This data is needed for gameplay, offline use, progress and preferences. Most of it stays on your device unless you use a feature that requires an external service.
2. Optional account and sync
You can use One Line without an account. If you create an account or sign in, some data may be synced with Supabase: email address, display name, user id, progress, solutions, results, hints and technical sync events.
Sync is designed to tolerate interruptions. If the online service is unavailable, the app continues locally and can retry later.
One Line may also create an encrypted backup tied to a recovery code. The snapshot is encrypted on your device before upload; the code is not sent to Supabase and remains necessary to restore the backup.
3. Google sign-in, feedback and leaderboards
If you choose Google sign-in, authentication is handled by Supabase and Google. One Line receives only the information needed to authenticate you, create or retrieve your profile and sync your progress.
Feedback, ratings or problem reports may include your comment, rating, problem flag, submission time, a local or account identifier and limited browser technical data.
Leaderboards may display your display name and progress results. They should not expose your email, local secrets or internal technical identifiers.
4. Analytics, ads and error reporting
One Line may use Microsoft Clarity and Firebase Analytics to understand general product usage. These analytics are optional and are enabled only if you allow them in the privacy banner or preferences.
One Line may use Google AdSense / Google Ads to prepare, serve and measure ads. Google or third-party ad providers may use cookies, identifiers or similar technologies based on your settings, region and applicable rules.
Sentry is used to diagnose technical errors with minimized configuration. Reports may include the error type, technical traces, cleaned URL paths and limited runtime environment information.
5. Third-party services
Depending on the features used, One Line may rely on:
- Supabase for authentication, sync, profiles and leaderboards;
- Google for OAuth, Google Play, AdSense or Google Ads;
- Microsoft Clarity and Firebase Analytics for optional analytics;
- Sentry for error reporting;
- Vercel or the site host for the web app and PWA.
We do not sell your personal data.
6. Your choices
You can use One Line without creating an account, decline optional analytics, update privacy preferences in Settings, manage ad personalization in Google ad settings, delete local data from your device or request deletion of account-associated data.
Avoid including personal or sensitive information in comments submitted through the app’s forms.
7. Retention and deletion
Local data remains on your device until you delete it, reset the app, clear browser storage or the browser removes it.
Synced data may be kept as long as needed to provide account, progress, leaderboard, diagnostic, security and service-improvement features.
To request deletion of data associated with your account, contact max.manseau01@gmail.com. Requests will be handled within a reasonable time, subject to data that must be retained for legal, security or technical operation reasons.
8. Children
One Line is not intended to knowingly collect personal information from children. If you believe a child sent us personal information, contact us so we can take appropriate steps.
9. Changes and contact
This policy may be updated as the app evolves. The last updated date will be adjusted, and important changes may also be communicated in the app when needed.