Subduo — Privacy Policy

Last updated: 5 June 2026

Subduo is a browser extension that adds dual subtitles and hover-to-translate word lookups to Netflix and YouTube for language learners. This policy explains exactly what data Subduo handles and what it does not.

The short version: Subduo has no accounts, no analytics, and no servers of its own. It does not track you, profile you, or sell or share your data. The only data it sends anywhere is the subtitle text and individual words you choose to translate, which go to Google's public translate service so they can be translated and shown back to you.

What Subduo accesses and why

Subtitle text and hovered words (website content). On a Netflix or YouTube watch page, Subduo reads the on-screen subtitle text to display it, and sends subtitle lines (and any word you hover in source-only mode) to Google's public translate endpoint (translate.googleapis.com) to be translated and shown back to you. This is the only data transmitted off your device, used solely to provide the translation feature you requested.
Your settings. Your language pair, subtitle mode, and study options are saved locally with chrome.storage.
A local translation cache. Translations are cached on your device so repeats are instant and work offline. This cache never leaves your device.

What Subduo does NOT do

No personally identifiable information, authentication, financial, health, location, or browsing-history data.
No recording of clicks, keystrokes, or mouse movement as data.
No analytics or tracking of any kind.
No selling or transferring of data for advertising or any purpose unrelated to translation.
No use of data for creditworthiness or lending.

Third-party service

Subtitle text and hovered words are sent to Google Translate to be translated. Google's handling of that data is governed by Google's privacy policy. Subduo sends only the text to be translated and does not attach your identity to it.

Permissions

storage — save settings and cache translations locally.
Access to netflix.com and youtube.com watch pages — read subtitle text and display the overlay.
Access to translate.googleapis.com — fetch translations.

Data retention and removal

Settings and the translation cache live only on your device. Removing the extension deletes all of Subduo's locally stored data.

Changes to this policy

If this policy changes, the updated version will be posted here with a new "last updated" date.

Contact

Open an issue at github.com/ertanm/subduo/issues or email ertansofia@gmail.com.