ExplainLang Privacy Policy

Last updated: May 24, 2026

ExplainLang is a Chrome extension that helps Chinese-speaking users understand selected English words, phrases, and sentences while reading web pages. This policy explains what data ExplainLang handles and how it is used.

Information ExplainLang Handles

ExplainLang may handle the following information when you use it:

• English text that you actively select on a web page.
• Nearby page context used to improve the explanation.
• The page title and page URL for saved review items.
• Your saved vocabulary items and review progress.
• Extension settings such as AI source, API base URL, model, and API mode.

How Information Is Used

ExplainLang uses selected text and nearby context only to generate an English-learning explanation in Simplified Chinese and, if you choose to save it, to store the item for local review.

Local Storage

Saved vocabulary items, review state, and settings are stored locally in Chrome extension storage on your device. ExplainLang does not provide accounts, cloud sync, or server-side storage.

AI Processing

By default, ExplainLang first tries to use Chrome Built-in AI when it is available in your browser. When Chrome Built-in AI is unavailable, ExplainLang sends the selected text, nearby context, page title, and page URL to the configured remote AI endpoint to generate an explanation. The default remote endpoint is OpenRouter at https://openrouter.ai/.

Data Sharing

ExplainLang does not sell user data. ExplainLang does not share data with advertising networks, data brokers, or analytics providers. Remote AI requests are sent only when needed to generate an explanation after you use the extension.

Data Retention and Deletion

Saved vocabulary items remain on your device until you delete them or clear extension data. You can use ExplainLang Options to export saved items as JSON or clear all saved items.

Children

ExplainLang is not directed to children under 13 and does not knowingly collect personal information from children.

Changes to This Policy

This policy may be updated when ExplainLang changes how it handles data. The latest version will be published at this URL.

Contact

For privacy questions, contact the developer through the support channel listed on the Chrome Web Store listing for ExplainLang.