Read Frog

Cos'è Read Frog?

Read Frog is an open-source browser extension and web app for language learning through everyday reading and video. The extension translates web pages, selected text, paragraphs, and supported video subtitles, with options to compare translations beside the original or read a translated page. Words and explanations saved from the extension can be organized in a Notebase and reviewed as flashcards on a spaced-repetition schedule. Translation can be used without an account; the web app provides note management and review.

Cosa può fare Read Frog?

Multiple page translation modes

Translate a full page beside its original text or replace the source with the translation. A paragraph can also be translated on demand, and selected text can be translated in place.

Video subtitles in two languages

Show original and translated subtitle lines together on YouTube, Netflix, and X. Select words in subtitles to look them up and save them for later review.

Custom AI Actions on selected text

Create repeatable prompt-based actions that return structured cards, such as word lookups, sentence analysis, writing feedback, or summaries. Actions can use built-in AI or a compatible provider you configure.

Save notes and review flashcards

Save words and explanations to a Notebase, make them into cards, and review on a spaced-repetition schedule. The extension can save study material as you read.

Read text aloud

Text-to-speech supports more than 70 languages, including sentences that mix languages.

Translation providers and language coverage

Read Frog supports 179 languages. Google Translate and Microsoft Translator work without an API key; users can also connect their own model provider.

Casi d'uso

“Read articles in a new language”

Keep the source text visible while checking a page translation when needed, or switch to translation-only mode for uninterrupted reading.

“Study from online video”

Watch YouTube, Netflix, or X with original and translated subtitles together, and capture unfamiliar vocabulary directly from a subtitle.

“Understand difficult sentences”

Select a long sentence for a structured analysis that identifies its clauses and sentence parts, with a translation to support comprehension.

“Build vocabulary from real contexts”

Save a word with its page-specific definition and review it later as a flashcard rather than separating study from the material where it appeared.

“Improve or transform selected writing”

Run an action on selected text to check phrasing or perform a repeatable task such as summarizing, using the surrounding page context where relevant.

Domande frequenti

Do I need an account or API key to translate pages?

Translation works without an account. Google Translate and Microsoft Translator can be used immediately without a key. Built-in AI Actions have a limited daily allowance without an account; signing in raises that allowance.

What platforms and content does Read Frog support?

Read Frog is a browser extension with a web app for managing notes and reviewing flashcards. The extension works with web pages and subtitles on YouTube, Netflix, and X.

Can I use my own AI provider?

Yes. You can choose an LLM provider that supports structured output for Custom AI Actions. The site also describes a bring-your-own-key workflow for providers such as OpenAI, Gemini, and DeepSeek.

Does Read Frog include an EPUB reader?

Users can import books through a third-party EPUB reader and use the extension while reading. Read Frog's own EPUB reader is in beta for selected accounts, and uploading books to it is a Pro feature.

Can it read PDFs or comics?

PDF and comic reading are not currently supported.