Privacy Policy

Last updated: May 29, 2026

This Privacy Policy describes how 3DSync ("the Application", "we", "us") handles information when you use the 3DSync homebrew application for Nintendo 3DS and the accompanying web-based configurator hosted at https://vllni.github.io/3DSync/ (collectively, "the Service"). By using the Service you acknowledge that you have read and understood this policy.

1. No Data Collection by the Developer

The developer of 3DSync does not collect, receive, store, or process any personal data about you. The Service does not include analytics, tracking pixels, crash reporters, or any server-side component operated by the developer. All processing described below occurs exclusively on your own devices.

2. How the Configurator Web App Works

The configurator is a fully client-side static web page. When you authenticate with a cloud provider, the following happens entirely inside your browser:

• Google Drive: You are redirected to Google's own OAuth 2.0 consent screen. Google issues an authorisation code which is exchanged directly from your browser for an access token and a refresh token by calling https://oauth2.googleapis.com/token. These tokens are stored in your browser's localStorage solely to assemble the config file. They are never transmitted to any server controlled by the developer and remain until you clear this site's data.
• Dropbox: You are redirected to Dropbox's own OAuth 2.0 consent screen. Dropbox returns an access token in the URL fragment. This token is read by the page, stored in localStorage to assemble the config file, and is never sent anywhere else.

Once you click Download, the config file is saved to your computer. Tokens stored in localStorage remain until you clear this site's data.

3. Google API Services – Limited Use Disclosure

3DSync's use of information received from Google APIs will adhere to the Google API Services User Data Policy , including the Limited Use requirements.

Specifically, the Application requests the https://www.googleapis.com/auth/drive scope solely to upload and download files between your Nintendo 3DS SD card and your own Google Drive account. The Application:

• does not use Google user data to serve advertisements;
• does not allow humans (including the developer) to read your Google Drive data;
• does not transfer your Google user data to third parties except as necessary to provide the file-sync functionality (i.e., the 3DS device you own, operating under your Google credentials);
• does not use Google user data for any purpose other than syncing files you have explicitly configured.

4. Data Stored on Your Devices

The downloaded 3DSync.ini config file contains your OAuth refresh token and optional folder identifiers. This file is stored on your personal SD card and is your responsibility to protect. You should not share this file publicly. To revoke access at any time, visit your Google Account's Third-party app access page or your Dropbox connected apps page and remove 3DSync.

5. Third-Party Services

The configurator loads fonts and icons from Google Fonts and Font Awesome CDNs, and the Materialize and StreamSaver libraries from jsDelivr. Your browser may send standard HTTP request metadata (such as your IP address) to those CDN providers when fetching these resources. Their use of that data is governed by their own privacy policies, not this one.

Your use of Google Drive is governed by Google's Privacy Policy. Your use of Dropbox is governed by Dropbox's Privacy Policy.

6. Children's Privacy

The Service is not directed at children under the age of 13. We do not knowingly collect any personal information from children.

7. Changes to This Policy

We may update this Privacy Policy from time to time. The "Last updated" date at the top of this page will reflect any changes. Continued use of the Service after a change constitutes acceptance of the updated policy.

8. Contact

Questions about this Privacy Policy can be directed to the developer via GitHub Issues.