PolySubsTerms of Service
Last updated: 5 November 2026
By installing or using the PolySubs browser extension ("PolySubs", "the service"), you agree to these terms.
1. The service
PolySubs is a browser extension for Chrome and Microsoft Edge that displays translated subtitles on YouTube videos and provides language-learning tools such as word lookup, quizzes, read-aloud and speaking practice. A free version is available. Additional features are available with a paid Premium subscription.
2. Premium subscription
- Premium costs US$3 per month or US$25 per year, plus any applicable taxes.
- New monthly subscribers get their first month free. A payment method is required to start the free month. If you don't cancel before the free month ends, the subscription continues at the regular monthly price. The free month is limited to one per customer.
- Subscriptions renew automatically at the end of each billing period until you cancel.
- You can cancel at any time using the link in your receipt email or the customer portal. Premium stays active until the end of the period already paid.
- After payment you receive a license key. Each key can be activated on up to 3 devices for your personal use. To move Premium to a new device, remove the license from an old one in the extension settings. Sharing or reselling license keys is not allowed.
3. Payments
Our order process is conducted by our online reseller Lemon Squeezy (Lemon Squeezy, LLC), which is the merchant of record for all orders. Lemon Squeezy handles payments, invoices, taxes and customer billing support.
4. Acceptable use
- Use PolySubs for personal learning only.
- Do not attempt to bypass license checks, modify the extension to unlock paid features, or redistribute it.
- You are responsible for following YouTube's terms of service when watching videos.
5. Third-party services
PolySubs relies on third-party services such as YouTube, Google Translate and Chrome's built-in features. We do not control these services. Their availability or quality may change, and features that depend on them may stop working without notice. Translations are generated automatically and may contain mistakes.
PolySubs is an independent product and is not affiliated with, endorsed by or sponsored by YouTube or Google LLC. YouTube is a trademark of Google LLC.
6. Disclaimer and limitation of liability
The service is provided "as is", without warranties of any kind. To the maximum extent allowed by law, our total liability for any claim related to the service is limited to the amount you paid for it in the 12 months before the claim.
7. Changes
We may update these terms or our prices. We will give at least 30 days' notice before a price change affects an existing subscription.