CastReader
CastReader is a text-to-speech reader that reads webpages, PDFs, Kindle books, and AI answers aloud with synchronized highlighting. It supports nine languages and includes full German support for voice selection, the extension interface, and Kindle OCR. The tool is distributed as a browser extension for Chrome, Edge, and Firefox, with a Safari version planned, and as mobile apps for iOS and Android. The service includes a Read & Explain feature that provides spoken explanations of difficult passages while keeping the source text visible. A visual pen highlights, underlines, and circles key points in the original text, and explanations can be delivered in a different language from the source. This aims to help users understand dense or foreign-language content, such as academic papers. CastReader offers a Voice Hub where users can preview and compare text-to-speech voices, check language availability, and see Free or Pro access status. It also provides specialized workflows for reading Kindle books on a phone, adding read-aloud capabilities to Claude answers, and troubleshooting Google Docs read aloud issues. The homepage lists high user ratings, including 4.7 on Chrome Web Store, 5.0 on App Store, and 4.5 on Google Play.
- Category
- AI Text-to-Speech
- Pricing
- Unknown
Problem solved
CastReader solves the problem of consuming written content when reading is inconvenient or difficult. It converts webpages, PDFs, Kindle books, and AI answers into natural-sounding speech with synchronized highlighting, and its Read & Explain feature helps users understand dense or foreign-language passages by providing spoken explanations in their preferred language with visual annotations.
Use cases
- Listen to web articles while commuting
- Read PDF documents aloud with synchronized highlighting
- Listen to Kindle books on a phone with background playback
- Have difficult passages explained in your own language
- Add read-aloud to Claude AI answers
- Troubleshoot Google Docs read aloud limitations
- Preview and select TTS voices in the Voice Hub
Audience
- Researchers
- Business Users
- Content Creators
- Hobbyists
Pros
- Supports webpages, PDFs, Kindle books, and AI answers
- Read & Explain provides cross-language spoken explanations with visual highlights
- Synchronized highlighting across multiple languages (9 languages)
- Available on Chrome, Edge, Firefox, iOS, and Android
- Voice Hub lets users preview and compare TTS voices
Cons
- Pricing details not clearly disclosed on the homepage
- Safari support marked as 'Soon'
- No desktop app for Windows/macOS listed
- Requires Chrome extension or mobile app for core functionality
- Some advanced features may require Pro plan
Official website: https://castreader.com/
Canonical LambdaBase page: https://www.lambdabase.com/tools/castreader