Privacy Policy – Glossa

Last updated: October 2, 2026

Glossa is a browser extension that helps you learn vocabulary from YouTube captions. This policy explains what data the extension handles, where it goes, and what stays on your device.

Data stored on your device

Glossa saves your study data locally using chrome.storage.local:

words you marked as known and how often you have seen each word
flashcards you created (sentence, translation, video link and timestamp) and their review schedule
exercise history and results
your settings (studied language, your language, preferences)
if you configure AI features: your AI provider URL, model and API key

This data is never sent to the developer. There is no account, no analytics and no tracking. You can export it to a backup file or delete it at any time from the extension's Settings page, or by uninstalling the extension.

Data sent to third-party services

To provide its features, Glossa sends limited text to the following services, only when the feature is used:

Service	What is sent	When
Google Translate (translate.googleapis.com)	the word or sentence to translate	when you look up a word or create a flashcard
Free Dictionary API (api.dictionaryapi.dev)	the English word	when you look up an English word
Tatoeba (tatoeba.org)	the word being reviewed	when you study vocabulary flashcards
Your AI provider (DeepSeek by default, or one you configure)	caption lines from the current video and words you are studying, with your own API key	only if you add an API key and use exercises or AI flashcards

Glossa does not send your browsing history, the pages you visit, or any personal information. Each service handles the text it receives under its own privacy policy.

What Glossa does not do

It does not sell or share your data with anyone.
It does not use your data for advertising, profiling or creditworthiness.
It does not run on websites other than YouTube.

Contact

Questions or requests: https://github.com/eduumach/english-extension/issues