Privacy Policy
Who we are
MotherSubs (the browser extension and mothersubs.com) is operated by Olivier Radziminski, France. For any privacy question or request, contact support@mothersubs.com.
What MotherSubs does
MotherSubs helps you learn languages on YouTube by showing synchronized subtitles with pronunciation, translations and word explanations. An account is required.
Information we process
- Account: when you sign in with Google, we receive your name, email address and profile picture.
- Captions: on youtube.com, after you approve a caption track, the extension sends the caption text, timestamps, nearby caption context, the YouTube video ID, caption track information and your chosen translation language to our servers to prepare your learning subtitles.
- Word explanations: when you click a word, the selected expression and its sentence are processed to explain it.
- Usage: processing jobs, their status, timestamps, token counts and costs, used to run the service and apply your credit.
- Payments: payments are handled by Stripe. We store your Stripe customer identifier, subscription status and credit balance. We never see or store your card details.
- Messages you send us: when you use the contact form on your account page, we store the message and its category (bug, request or other) with your account, to answer and improve MotherSubs.
- Affiliate program: if you are an affiliate, we store your promotion code, the subscribers who used it and the commissions earned and paid. If you subscribed with an affiliate's code, that affiliate is linked to your Stripe customer and sees only counts and amounts, never your name or email.
- Technical data: sign-in sessions may record your IP address and browser user agent; IP addresses are also used, in hashed form, for rate limiting.
- Website statistics: mothersubs.com uses Vercel Web Analytics to count page views and visits in aggregate. It uses no cookies and does not identify you or follow you across sites. The extension sends no analytics.
MotherSubs does not upload video or audio, does not read your browsing history, and only runs on youtube.com and mothersubs.com.
How we use it
Only to provide the service: sign you in, prepare and display your subtitles and explanations, reuse subtitles already prepared for your account, manage your credit and subscription, prevent abuse, and fix problems. We do not use your data for advertising, we do not sell it, and we do not build profiles of you. The only statistics are the anonymous, cookie-free website page counts described above.
Service providers
Your data is processed by the following providers, only as needed to run MotherSubs:
- Google — sign-in, and YouTube captions.
- OpenAI — AI processing of caption text and word explanations. Requests are sent with storage disabled and are subject to OpenAI's API data policies.
- Vercel — hosting of the website and API, and the cookie-free website statistics.
- Neon — database (accounts, jobs, credit).
- Hostinger — server storing prepared subtitles.
- Stripe — payments and subscriptions.
Some of these providers are located in the United States, so your data may be transferred outside the European Union, under the safeguards those providers offer.
How long we keep it
We keep your account and the subtitles prepared for you until you delete your account. Backups are kept for up to 7 days, so deleted data disappears from backups within 7 days. Payment records may be kept longer where the law requires it. In the extension, sign-in tokens expire after 10 minutes (access) and 30 days (refresh).
Your choices and rights
- You decide which caption tracks are processed, and you can turn MotherSubs off or sign out at any time.
- You can delete your account and all associated data from your account page. This also cancels any active subscription.
- Under the GDPR you can request access to, correction, export or deletion of your data, or object to its processing, by writing to support@mothersubs.com. We answer within 30 days.
- You can also file a complaint with the French data protection authority (CNIL, cnil.fr).
Security
All connections use HTTPS, sign-in tokens are stored only in trusted extension storage, and each account can only access its own data. No method is perfectly secure, but we work to protect your information.
Children
MotherSubs is not intended for children under 15.
Changes
We will update this page if our practices change and change the effective date above.