Privacy Policy

1. Introduction & Architecture

Twin ("the Application") is an open-source Windows desktop client for Google Drive, created by Tijil Das. Twin operates solely as a local tool on your computer. All processing, hashing, chunking, and file synchronization happen directly on your local device.

2. How Your Google Data Is Handled

When you connect Twin to your Google Drive account, the Application interacts directly with Google APIs:

• Direct Communication: All data transmissions occur strictly between your computer and Google's official endpoints (googleapis.com). Twin has no back-end server, relay proxy, or cloud database.
• OAuth 2.0 PKCE Authentication: Sign-in uses standard OAuth 2.0 with Proof Key for Code Exchange (PKCE) over a temporary local loopback server. Twin never sees or handles your Google password.
• Encrypted Local Storage: OAuth access tokens and refresh tokens are encrypted using Windows Credential Manager (wincred) on your local machine. They are never transmitted to third parties or remote servers.
• File Content: Your files, filenames, folder hierarchies, and revision histories are accessed solely to execute the sync operations you configure.

3. Zero Telemetry & Zero Tracking

Twin respects your right to complete privacy:

• No analytics SDKs, trackers, or telemetry probes are bundled in the binary.
• No user behavior, usage metrics, device fingerprints, or crash reports are transmitted.
• No advertising cookies, profiling, or tracking mechanisms are used on the Application or website.

4. Google API Services User Data Policy

Twin's use and transfer to any other app of information received from Google APIs will adhere to the Google API Services User Data Policy, including the Limited Use requirements.

Specifically, user data obtained through Google Drive scopes is used exclusively to provide user-facing file synchronization and management features and is not used for any other purpose.

5. Local Diagnostics & Logging

Any sync diagnostic logs produced by the application are written exclusively to your local storage. You maintain complete control over these log files and may review, inspect, or delete them at any time.

6. Open Source Transparency & Auditing

Because Twin is distributed under the open-source MIT License, the complete source code is public and verifiable on GitHub. You are free to inspect, audit, and build the software directly from source:

Repository: https://github.com/Tijil-Das/Twin

7. Contact & Questions

If you have questions or concerns regarding this Privacy Policy, you can open an issue or inquiry on our official GitHub repository at github.com/Tijil-Das/Twin/issues.