Privacy Policy

Last updated: March 21, 2026

Summary

掰it is a browser extension that runs primarily on your device. Your learning data, API keys, and browsing content stay local. With your explicit consent, we collect anonymous usage data to improve the product — this data contains no personal information and no browsing content.

Data Storage

All your personal data is stored locally on your device using the browser's built-in storage APIs (chrome.storage and IndexedDB):

API Key — Your LLM API key is stored locally and is only used to make requests directly from your browser to the LLM provider you choose. It is never sent to us or any third party.
Learning Data — Your vocabulary records, chunking history, and learning progress are stored locally in IndexedDB. None of this data leaves your device.
Preferences — Your settings (display options, etc.) are stored locally via chrome.storage.

Anonymous Usage Analytics (Opt-in)

If you choose to opt in, we collect anonymous usage data to understand which features are useful and where users encounter difficulties. This is entirely optional — you can enable or disable it at any time in Settings.

What we collect:

Feature usage events — which buttons you click, which features you use (e.g., "user clicked the chunking button", "user marked a word as mastered")
Interaction patterns — how long you hover on a word tooltip, which settings you change
Frustration signals — rapid repeated clicks on the same element (indicating an expected feature is missing)
Error reports — extension code errors (not webpage errors)
Session recordings of the options/settings page only (not the webpages you browse)

What we never collect:

The URLs or content of webpages you visit
Your API keys or any credentials
The specific words or sentences you read
Any personally identifiable information (name, email, IP address)
Your browsing history or activity on other websites

Each installation is assigned a random anonymous ID (UUID) that cannot be linked to your identity. If you uninstall and reinstall the extension, a new ID is generated.

Network Requests

This extension makes the following network requests:

LLM API — Requests from your browser directly to the LLM provider you configure (e.g., Gemini, OpenAI, DeepSeek). Uses the API key you provide.
Analytics (opt-in only) — If you have opted in, anonymous usage events are sent to PostHog (our analytics provider). No personal data or browsing content is included in these requests.

Third Parties

LLM Providers — When you configure an API key, requests are sent directly from your browser to the provider you choose. We do not proxy or store these requests.
PostHog — If you opt in to usage analytics, anonymous event data is sent to PostHog (posthog.com). PostHog processes this data on our behalf. No personal data or browsing content is shared.

We do not use advertising, data brokers, or any other third-party services.

Your Choices

Analytics is off by default. You choose whether to enable it.
You can turn analytics on or off at any time in the extension's Settings page.
Disabling analytics does not affect any extension functionality.

Contact

If you have questions about this privacy policy, please contact us at [email protected].