Privacy Policy

Last updated: April 2026

To use Google Drive storage, you must sign in with a Google account. The following permissions are requested:

• openid / profile — Used to obtain your display name, profile picture, and Google account ID (for header display and sign-in management).
• Google Drive (drive.file) — Access only to files created or opened by this app. No access to your entire Google Drive.

The following data is obtained from your Google account:

• Display name
• Profile picture URL
• Google account ID

For sign-in management, the database stores your display name, profile image URL, and Google account ID.

Document data (diagram/text editing content) is stored only in the following locations:

• Local storage: Saved in your browser on this device (it stays on the device and is not sent to our server).
• Google Drive storage: Saved as a file within your own Google Drive account. Our server does not retain the file.

We do not sell or share collected data with third parties.

For privacy-related questions, please contact us via the GitHub repository Issues.