Read Frog

Read Frog is a browser extension that translates web pages and video subtitles with AI and turns saved vocabulary into flashcards. It is built for people learning a language from content they already read and watch, covering web pages, YouTube videos and ebooks, with PDFs and comics listed as coming soon. Translation works in several modes. Bilingual mode places the translation beside the original text without disturbing page layout, translation only mode replaces the original, and selection translation handles a single sentence. A hover plus hotkey shortcut translates one paragraph at a time. Custom AI Actions let a user write their own prompt to run on selected text, with examples such as a dictionary lookup, writing improvement and timezone conversion, using the article as context. Saved words and sentences go into a notebase and are reviewed as flashcards on an FSRS spaced repetition schedule. The project is open source and works with OpenAI, DeepSeek, Gemini or Ollama. The Free plan costs US$0 and includes page and YouTube translation, custom AI Actions, 10 notes and limited flashcard review. Pro is US$2.50 per month, billed US$30 yearly, and adds built in AI for AI Actions, 300 minutes of AI video subtitles monthly, unlimited notes and unlimited review. Ultra is US$5.83 per month, billed US$70 yearly, and adds built in AI for every feature, an advanced built in model, 1000 subtitle minutes monthly, MCP access from ChatGPT and Claude, early beta access and priority support. Yearly prices are shown as an early bird offer.