An AI language-learning extension for browsers, and an open-source alternative to Immersive Translate.
Translate web pages, the sentences you select, and subtitles on YouTube, X, and Netflix. Then save the words you meet and review them as flashcards on an FSRS schedule.
Master languages effortlessly and deeply with AI, right in your browser.
Official Website · All Features · Tutorial · Changelog · Blog · vs Immersive Translate
Table of contents
- 📺 Demo
- 👋🏻 Getting Started & Join Our Community
- ✨ Features
- 🤝 Contribute
- 📜 Commercial License Grant
- ❤️ Sponsors
🔊 The player starts muted — turn the sound on.
read-frog-feature-tour.mp4
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 era, but there are few products on the market that meet this demand. Therefore, we decided to take matters into our own hands and ultimately make the world no longer reliant on human language instructors.
Whether you are a user or a developer, Read Frog will be an important part of your journey toward this vision. Please be aware that Read Frog is currently under active development, and feedback is welcome for any issues encountered.
| Browser | Version | Download |
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| Chrome | |
Chrome Web Store or 中国镜像 |
| Edge | |
Microsoft Edge Addons |
| Firefox |  |
Firefox Add-ons |
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In Discord ask questions, and connect with developers. |
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If you are in mainland China, you can add the WeChat account to join the WeChat group. |
Important
⭐️ Star Us, You will receive all release notifications from GitHub without any delay ~
Star History
Transform your everyday web reading into an immersive language learning journey with Read Frog's powerful features.
Turn selected text into reusable AI tools that match the way you read and learn. Define your own prompts and structured output fields, choose a provider, model, and icon, then run the action directly from the selection toolbar for dictionary lookups, rewriting, summaries, explanations, or any workflow you design.
Start with the built-in Dictionary and Improve Writing templates, or build an action from scratch. Structured results can also be mapped and saved to Notebase for later study.
Save vocabulary, definitions, example sentences, translations, and reading notes to Notebase, then turn them into flashcards with customizable card templates. Content you discover while reading becomes study material without interrupting your flow.
Review due cards online and rate each one Again, Hard, Good, or Easy. Read Frog's spaced-repetition scheduler uses your feedback to decide when each card should appear again—right before you are likely to forget it.
Switch seamlessly between two translation display modes. Bilingual mode shows the original text alongside its translation, perfect for learning and comparison. Translation-only mode replaces the original text entirely for a cleaner reading experience.
The extension automatically re-translates all visible content when you switch modes while translation is active, ensuring a smooth transition without needing to refresh the page.
Select any text on a webpage to reveal a smart toolbar with powerful options. Translate streams the translation in real-time. Explain provides detailed explanations tailored to your language level. Speak reads the text aloud using text-to-speech.
The toolbar intelligently positions itself to stay within the viewport, supports drag interactions, and works across all websites. Perfect for quick lookups while reading.
Enable AI to understand the full context of what you're reading. When activated, Read Frog extracts the page title and a concise Markdown version of the page content, providing this context to the AI for more accurate, contextually-appropriate translations.
This means technical terms get translated correctly within their domain, literary expressions maintain their nuance, and ambiguous phrases are interpreted based on the surrounding content rather than in isolation.
Translate subtitles on YouTube, X, and Netflix right in the video player. The translation appears with the original line, in sync with the video. For YouTube videos without captions, AI can transcribe the audio and show the result as the same bilingual subtitles (included in Pro and Ultra). Select any word in the subtitles to look it up and save it for review.
Listen to any selected text with high-quality AI voices. It is completely free, with 300+ voices across 70+ languages including Chinese, English, Japanese, Korean, and many more. Adjust rate, pitch, and volume to your preference.
Automatic language detection (basic or LLM-powered) with per-language voice mapping ensures the right voice for every language. Smart sentence-aware chunking handles long text by splitting at natural boundaries and prefetching the next chunk for seamless playback. Perfect for pronunciation practice and auditory learning.
Save up to 70% on API costs with intelligent request batching. Read Frog groups multiple translation requests into single API calls, reducing overhead and token usage while maintaining translation quality.
The system includes smart retry logic with exponential backoff and automatic fallback to individual requests if batch processing fails. All handled transparently in the background.
Connect to 20+ AI providers through Vercel AI SDK: OpenAI, DeepSeek, Anthropic Claude, Google Gemini, xAI Grok, Groq, Mistral, Ollama, and many more. Configure custom endpoints, API keys, and model settings for each provider.
Plus free translation options: Google Translate, Microsoft Translate, and DeepLX for cost-free basic translations.
Contributions of all types are more than welcome.
- Promote Read Frog to your friends and family.
- Report issues and feedback.
- Contribute code.
Project Structure: DeepWiki
Ask AI to understand the project: Dosu
Check out the Contribution Guide for more details.
ReadFrog is dual-licensed under GPLv3 and a commercial license.
See CONTRIBUTING.md for contributor licensing terms.
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