Miguan Privacy Policy

Last updated: September 2026

Overview

Miguan is a browser extension for language learning. It is built on a local-first principle: your personal data stays on your device, and the developer does not operate any server that collects or stores it.

Information we do not collect

We do not collect, store, or transmit any personal data to the developer. We do not run analytics that identify you, and we do not sell or share personal information.

Data stored on your device

Miguan stores the following data locally using your browser's built-in storage (chrome.storage / IndexedDB):

  • Vocabulary items you save (words, translations, usage examples)
  • Preferences and settings (theme, interface language, feature toggles)
  • API keys for third-party AI services you configure

This data never leaves your device unless you explicitly use a feature that requires network access (described below).

Network access

Miguan only makes network requests in the following cases:

  1. AI features (translation, summarization, mentor, harvesting). The text you select is sent to the AI model provider you have chosen:
    • For providers you configure yourself (OpenAI, Google Gemini, Anthropic, DeepSeek, Ollama, etc.), requests are sent directly from your browser to that provider.
    • For Miguan Cloud, requests are relayed through the Miguan backend (priceof.top), which forwards them to the model and returns the result. The relay does not persist your text.
  2. Obsidian sync (optional). If enabled, your vocabulary data is sent directly from your browser to the Obsidian vault URL you configure.
  3. PDF viewer. The built-in PDF viewer loads its resources from the extension package; no external requests are made for PDF rendering.

Data sharing

We do not share your data with advertisers or third parties. When you use AI features, the text you select is sent only to the AI provider you choose (or relayed via Miguan Cloud as described above). The developer has no access to these requests or responses.

Permissions

Miguan requests the following browser permissions, and why:

  • Host / activeTab — to read the webpage text you select for translation, summarization, and vocabulary harvesting. We only access text you actively select or the page you are viewing; we do not read data from other tabs or sites.
  • Storage — to save your vocabulary, preferences, and API keys locally on your device.

Children

Miguan is not directed to children under 13 and does not knowingly collect their data.

Changes

This policy may be updated from time to time. Continued use of the extension constitutes acceptance of the updated policy.

Contact

Questions about this privacy policy? Email burxtian@gmail.com or open an issue on the project's GitHub repository.

Open source

Miguan is open source software. Its source code is publicly available for independent review.