CastReader is a Chrome extension that reads web articles, Kindle Cloud Reader books, PDFs, Notion and more aloud in natural AI voices across 40+ languages, with real-time word highlighting. Its Read & Explain mode does more than narrate — it explains the text in plain language as it reads, marks up the key passages like a teacher with a highlighter, and shows synced subtitles. It's the only TTS tool that works on Kindle Cloud Reader. Free to start.
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