Privacy policy
Last updated 9 October 2026
Subgloss is a Chrome extension that shows the meanings of words in YouTube and Netflix subtitles. It is made by Mobility Arts Pty Ltd ("we"). This page explains what the extension keeps, what it sends, and to whom.
In short: no ads, no analytics, no tracking, and we never sell data. Almost everything stays on your computer. Subtitle text goes to the AI service you choose, using your own key. If you choose to sign in, we store your email address and your saved words so they appear on your other computers, and you can delete them at any time.
What stays on your computer
Kept in Chrome's storage for the extension, never sent to us: your settings, your AI service's API key, the meanings and translations already fetched (so a video isn't processed twice), downloaded dictionaries, and your saved words while you are not signed in. Removing the extension removes all of it.
What the extension sends, and to whom
| To | What | When |
|---|---|---|
| The AI service you set up: Google Gemini, OpenAI, Anthropic, or a server you name (such as Ollama on your own computer) | The subtitle lines of the video you are watching, the video's title, your two languages, and your API key | While you watch with Subgloss switched on. That service handles the data under its own terms and privacy policy; it does not pass through us. |
| Nobody: Chrome's built-in on-device AI | Nothing leaves your computer | If you choose on-device mode instead of an AI service |
| Our download storage (Amazon Web Services) and the jsDelivr network | An ordinary download request, which shows your IP address to the server; no other information | When you download a dictionary for on-device mode |
| Google, through Chrome | The word or line being read aloud | When you press a "listen" button and Chrome uses one of its online voices (those named "Google …"). Your computer's own voices work offline. |
| Us, only if you sign in | Your email address and your saved words (see below) | When you sign in, save or remove a word, and every few minutes while signed in |
On YouTube and Netflix, Subgloss reads the subtitles the site already loads in your browser. It sends those sites nothing beyond what the page itself requests.
If you sign in
Signing in is optional; everything else works without it. You sign in with a code sent to your email address, never a password. We keep:
- Your email address, to send you sign-in codes.
- Your saved words, so they appear on every computer where you sign in: for each word, the word and its dictionary form, reading, part of speech and meaning, the sentence it came from and its translation, your two languages, the video's site, ID, title, link and the moment in it, and when you saved or removed it.
We do not receive your API keys, your settings, the videos you watch (other than those you save words from) or the meanings fetched while you watch.
This data is stored with Amazon Web Services in the United States (sign-in by Amazon Cognito, words in Amazon DynamoDB, codes sent by Amazon SES), encrypted in transit and at rest. On your computer, the extension keeps your email address and a sign-in token that expires after 30 days. Our servers keep technical logs for 30 days to fix problems; they identify your account by an internal number, not your email address.
Deleting your data
- Delete account (Options → Account) deletes your account and every saved word stored in it, immediately. A note that the account was deleted, holding neither your email address nor any words, is removed within a few days. Our database backups keep deleted data for at most 35 days before it is gone for good. Words saved on your computer stay there until you remove them or the extension.
- Sign out stops syncing on that computer and keeps your account.
- Removing the extension deletes everything it kept on that computer.
Sharing
We don't sell or rent your data, show ads, or use it for anything but the features above. Amazon Web Services stores and processes it for us. Your AI service receives subtitles directly from your browser under your own agreement with it. We would disclose data only if the law required it.
Subgloss's use of information complies with the Chrome Web Store User Data Policy, including its Limited Use requirements.
Children
Subgloss is not directed at children under 13, and we don't knowingly collect their data.
Your rights and contact
You can ask what we hold about you, have it corrected, or have it deleted, by writing to privacy@subgloss.app. Deleting your account from the extension does the last of these at once. We use what you write to us only to answer it.
Changes
When this policy changes, this page is updated and the date at the top changes with it.