Companion Frog - An open-source AI translation browser extension tool

What is a study companion frog?

ReadFrog is an open-source AI-powered immersive translation browser extension. It can translate and interpret any content on a browser, supporting Chrome, Edge, and Firefox. Through context-aware translation, word highlighting, and TTS (Text-to-Speech) features, it helps users learn while reading real web pages. ReadFrog supports 20+ AI models, stores data locally, and its code is open-source and customizable.

The main functions of the tutor frog

• Immersive bilingual translationThe translation is displayed directly next to the original paragraph, preserving the original layout, and supports free switching between bilingual comparison and pure translation modes.
• Context-aware translationThe AI first reads and summarizes the entire article, and then performs accurate translation based on the article's theme and domain background, avoiding mistranslation of terminology.
• Intelligent word selection interactionSelect any word or sentence to view the translation, get a detailed explanation that matches your language level, or use TTS (Text-to-Speech) to read it aloud.
• Custom AI commandsSupported {{selection}},{{paragraphs}} Dynamic tags can be used to create custom translation prompts to meet the needs of specific fields.
• Batch request mergingIt intelligently merges multiple translation requests into a single API call, saving up to 70% on API costs.
• 20+ AI service providers have joined.Vercel AI SDK provides unified access to 20+ models including OpenAI, DeepSeek, Claude, Gemini, and Grok, while also supporting free translation from Google, Microsoft, and DeepLX.
• YouTube Subtitle Translation (Beta)It can translate subtitles directly within the video player, enabling language learning of the video content.
• Edge TTS voice readingIt offers free support for 150+ voices and 80+ languages, with adjustable speech speed between 0.25x and 4x.
• Intelligent content extractionAutomatically identifies webpage content, filters out advertisements and distracting information, and creates a clean reading environment.

How to use the tutoring frog

• Install extensionsVisit the Readfrog official website https://www.readfrog.app/, download the browser plugin, and add it to your browser.
• Initialization settingsAfter installation, select your native language and complete the basic configuration. It is recommended to pin the icon to the browser plugin bar.
• Configuration AI service providerGo to Settings → API Provider, enable the required AI service (such as OpenAI, DeepSeek) and enter the API Key, then click Test Connection to verify availability.
• Enable translationOpen the foreign language webpage, click the extension icon to enable "Immersive Translation," and view the translation next to the original text.
• Word highlighting learningSelect unfamiliar words or sentences while reading to view instant translations, detailed explanations, or use TTS to read them aloud.
• Adjust parametersAdjust the granularity of explanation based on individual language proficiency, and switch between bilingual/translation-only modes to optimize the reading experience.

The core advantages of the tutoring frog

• Open source, free, and customizableThe code is completely open source, with no ads and no registration required. Users can deploy or develop it themselves, and data is stored locally to ensure privacy.
• Deep Language Learning PositioningUnlike simple translation tools, this tool helps users truly "understand" rather than "read" by breaking down grammar, analyzing long and complex sentences, and interpreting context.
• Context-aware translation made freeThe context translation function, which is usually a paid feature, is now completely free. AI understands the article before translating it, greatly improving the quality of professional content translation.
• Ultimate API cost optimizationBatch request merging technology can save up to 70% on API fees, lowering the economic barrier for users to use AI translation.
• Flexible access to multiple modelsIt supports free switching between 20+ mainstream AI models, allowing users to choose the optimal translation engine as needed and avoid the limitations of a single model.

Comparison of similar products to "Companion Frog"

Application scenarios of the tutoring frog

• Foreign language learnersImprove your language skills through immersive reading of real web content. Learn while reading, and AI will analyze grammar and vocabulary like a foreign teacher.
• academic researchersWhen reading foreign academic papers and technical documents, use context-aware translation to accurately understand technical terms and avoid mistranslations such as "Shell → 壳" (shell).
• cross-border workersProcess foreign language emails, industry reports, and overseas information, quickly obtain accurate translations, and understand the deeper meaning.
• Developers/Technology UsersRead English technical blogs, GitHub documentation, and API manuals, and maintain consistent formatting by translating code blocks and text together.
• Interested readersGet instant assistance when reading foreign novels, blogs, and forums; practice listening and pronunciation through TTS reading aloud.