Privacy policy
Last updated 1 October 2026
Draft. This text is a working draft and has not been reviewed by a lawyer yet. It describes how the service works today in plain language, and it will be replaced by a reviewed version before launch.
This policy covers the Passive Polyglot web app and the DuoSubs browser extension. We collect as little as the service needs to work, and we do not sell your data.
What we collect
- Account details: your email address and a securely hashed password, or the identity your sign-in provider shares with us.
- Your learning data: the words and sentences you save, your flashcards, review history, streaks and settings.
- Billing details if you upgrade to Pro. Card payments are handled by Stripe; we never see or store your full card number.
- Error reports the extension sends when something breaks, so we can fix it. They describe the problem, not your browsing.
What the extension reads
On Netflix, DuoSubs reads the subtitle files of what you are playing so it can show two lines and translate them. On other websites it only acts on text you select or click to translate, and only if you allowed it to run there. It does not record your browsing history.
Services that process data for us
- Hosting and database for your account and cards.
- Stripe, for payments.
- Translation services: Chrome's built-in translator where available, and a web translation service as a fallback. The text you translate is sent to them.
- An AI provider for Pro features. Subtitle lines and saved words are sent to it to produce translations and example sentences.
How long we keep it
We keep your data while your account exists. When you delete your account, your profile, decks, cards, review history, study time and connected devices are deleted straight away. Payment records, ours and Stripe's, may be kept longer where the law requires it.
Deleting your account
You can delete your account yourself on your account page, under Delete account. You confirm by typing your email address. If you have an active Pro subscription, it is cancelled at the same moment, without a refund for the time left. Deletion cannot be undone, so download your data first if you want a copy.
Your rights and your data
You can download your data at any time from your account page, under Your data: a JSON file with your profile, decks, cards, review history and study time, or a CSV of your cards for a spreadsheet. You can also ask us to access, correct or delete your data, or to explain how it is used, by writing to rk@coldabry.com.
Contact
Questions about this policy: rk@coldabry.com.