CastReader vs ExplainTXT: AI Reading Assistant

Natural AI voices narrate webpages, PDFs, ebooks and documents while each spoken word is highlighted and the page auto-scrolls, so you never lose your place.

Instead of only reading a hard passage, CastReader summarises and unpacks its meaning in the language you know best, with an animated pen marking the key lines in the original text.

Works across Kindle, WeRead, Google Play Books, O'Reilly and other book platforms, news and newsletter sites, Google Docs, Notion, Gmail, plus ChatGPT, Claude, Gemini, DeepSeek and Kimi answers.

Preview real samples of dozens of voices across many languages, and create private cloned voices that Pro members can apply to their own PDF, EPUB, Word and TXT files.

Select any word, clause or paragraph on any website and get a plain-language explanation of just that part, right where you are reading.

Press ⌘⇧E (Ctrl+Shift+E on Windows) with nothing selected to summarize the entire page into a one-line gist plus key points.

The extension can read text aloud and completes as you type, supporting long reading sessions and auditory learners.

Answers open in a sidebar so you can keep questioning the page without opening another tab or app.