Verified project record

mengxi-ream/read-frog

A browser extension that turns web reading into an language learning tool with immersive translation, vocabulary flashcards, and AI-powered text analysis. It supports multiple AI and translation providers and requires no coding to install.

Project overview

Use cases: Translation & Subtitles · Learning & Education
Deployment: Refer to project documentation
License: GPL-3.0

Best for

Language learners who read foreign language content on the web and use Chrome, Edge, or Firefox.
Users who want to configure their own AI providers or local models for translation and text analysis.

Key capabilities

Turn selected text into reusable AI tools with custom prompts and structured output fields, running actions directly from the selection toolbar.
Save vocabulary, definitions, and reading notes to Notebase, turn them into flashcards with customizable templates, and review due cards using a spaced-repetition scheduler.
Switch between bilingual mode (original text alongside translation) and translation-only mode, automatically re-translating visible content on mode switch without refreshing.
Select any text on a webpage to reveal a smart toolbar offering real-time translation, detailed explanations, and text-to-speech.
Extracts the page title and a concise Markdown version of the content to provide context to AI for accurate and contextually-appropriate translations.
Translate YouTube subtitles directly in the video player with translations displayed alongside the original subtitles.
Listen to any selected text with AI voices powered by Edge TTS, featuring automatic language detection, rate/pitch/volume adjustment, and smart sentence-aware chunking.
Save up to 70% on API costs by grouping multiple translation requests into single API calls with smart retry logic and exponential backoff.

Limitations and risks

While free translation options like Google Translate exist, advanced features relying on AI providers may require user-supplied API keys and may incur paid service costs.
The extension is designed for desktop browsers and requires a compatible graphical interface.

Getting started

Install the extension directly from the Chrome, Edge, or Firefox Web Store without compilation or terminal usage. No coding is required to use the tool.

Evidence and sources

README: An open-source AI-powered language learning extension for browsers.
README: Read Frog's vision is to provide an easy-to-use, intelligent, and personalized language learning experience for language learners of all levels. This has become possible in the AI…
README: | Chrome | [![Chrome Version badge][chrome-version-shield]][chrome-store-link] | [Chrome Web Store][chrome-store-link] or [中国镜像][crxsoso-link] | | Edge | [![Edge Version badge][ed…
README: Transform your everyday web reading into an immersive language learning journey with Read Frog's powerful features.
README: **Bilingual mode** shows the original text alongside its translation, perfect for learning and comparison. **Translation-only mode** replaces the original text entirely for a clea…

Reviewed at: 2026-07-16T10:59:24Z