Privacy Policy for 无痛英语 - 生词标记
Last updated: April 30, 2026
无痛英语 - 生词标记 ("we", "our", or "the extension") is a browser extension for marking English vocabulary on webpages and syncing selected vocabulary with the 无痛英语 learning product.
Information We Process
| Data | How it is used |
|---|---|
| Webpage text | The extension reads webpage text locally in your browser to identify English words and phrases that may need marking. Full webpage content and browsing history are not uploaded to our servers. |
| Vocabulary data | Words, phrases, learning status, known status, timestamps, selected vocabulary level, and optional surrounding sentence context may be stored locally and, when you sign in, synced to our backend. |
| Account data | If you sign in, your email address and authentication session are processed to provide account and sync features. |
| Local settings | Extension settings such as enable/disable state, selected vocabulary level, imported word list, and local progress are stored in browser storage. |
How We Use Information
We use the information above only to provide core product functionality:
- highlight unknown English words and phrases on webpages;
- show definitions and learning priority hints;
- save words or phrases that you choose to mark;
- sync vocabulary progress across devices and with the companion app;
- load vocabulary levels, phrase dictionaries, and daily sentence content.
Third-Party Services
The extension uses Supabase as its backend service for authentication, vocabulary sync, vocabulary level data, phrase dictionary data, and daily sentence data. We do not use advertising SDKs or third-party analytics trackers in the extension.
Data Sharing
We do not sell, rent, or trade your personal information, vocabulary data, webpage content, or browsing history. We do not use your data for advertising.
Webpage Content
The extension requires access to webpages so it can mark vocabulary inside the page you are reading. This analysis happens locally in your browser. The extension may save and sync only the specific words, phrases, and optional context sentences that you choose to mark while using the product.
Data Storage and Deletion
Vocabulary data and settings are stored locally in your browser. If you sign in, selected vocabulary data may also be stored in our backend so it can sync across devices and with the companion app.
You can clear local extension data from your browser extension settings. You can also contact us to request account or synced data deletion.
Security
We use browser storage and Supabase authentication/backend infrastructure to protect account and vocabulary data. No method of electronic storage or transmission is perfectly secure, but we take reasonable steps to limit the data we process and use it only for product functionality.
Changes
We may update this Privacy Policy from time to time. Updates will be reflected by changing the "Last updated" date above.
Contact
If you have questions or deletion requests, contact us at liuysh20@gmail.com.