Generate speech with customizable voices in any language, and create captivating stories using natural-sounding voices.
34M visits/mo-7.6%#2 Audio & Voice
CastReader
Read aloud webpages, PDFs, and Kindle books with synced highlighting in 9 languages.
FreeStarting price
51KMonthly visits
28Popularity
About CastReader
CastReader is a cross-platform tool that converts text from webpages, PDFs, Kindle books, and AI chatbot responses into natural-sounding speech with synchronized word-by-word highlighting. It supports nine languages and includes a ‘Read & Explain’ feature that summarizes complex or foreign-language passages while visually marking key points in the original text. The tool integrates with popular platforms such as Google Docs, Gmail, Notion, and major AI services like ChatGPT, Claude, and Gemini, adding listen buttons to individual responses. Users can adjust playback speed, choose from multiple AI voices, and access features like text extraction from images. The browser extension works with Kindle Cloud Reader, enabling text-to-speech without replacing the original reading page. CastReader also offers native mobile apps for listening on the go, with features like auto-advance for books and background playback. The ‘Voice Hub’ allows users to preview and select voices tailored to specific reading tasks, including private voice cloning for personalized narration in supported formats like PDF, EPUB, Word, and TXT files. The tool is designed to improve comprehension by combining listening with visual guidance, making it suitable for research papers, technical documents, and long-form content across multiple languages.
Key features
- Reads webpages, PDFs, Kindle books, and AI chatbot responses aloud
- Word-by-word highlighting during playback
- Read and Explain feature for summarizing difficult passages
- Supports 9 languages
- Integrates with Google Docs, Gmail, Notion, and major AI platforms
- Adjustable playback speed and voice selection
- Text extraction from images
- Free tier with 20 minutes of daily listening
- Pro plan removes caps and unlocks premium features
Use cases
- Listening to articles or research papers while multitasking
- Learning new languages by hearing and seeing text simultaneously
- Accessing content hands-free during commutes or workouts
Pros
- Supports text-to-speech conversion across webpages, PDFs, Kindle books, and AI chatbot responses with synchronized highlighting
- Offers a 'Read & Explain' feature that summarizes complex or foreign-language passages while visually marking key points
- Integrates with major platforms including Google Docs, Gmail, Notion, and AI services like ChatGPT, Claude, and Gemini
- Provides adjustable playback speed, multiple AI voice options, and text extraction from images
- Available as a browser extension and mobile app with cross-device synchronization
Cons
- Free tier includes a daily listening limit of 20 minutes
- Advanced features like private voice cloning and full ebook support require a Pro subscription
Frequently asked questions about CastReader
What does CastReader do?
CastReader converts text from webpages, PDFs, Kindle books, and AI chatbot responses into natural-sounding speech with synchronized highlighting. It also offers a 'Read & Explain' feature that summarizes complex passages and visually marks key points.
Who is CastReader suitable for?
CastReader is suitable for students, researchers, professionals, and anyone who needs to listen to or understand dense or foreign-language content more effectively. It is particularly useful for long reads, technical documents, and AI-generated explanations.
How does the pricing model work?
CastReader offers a free tier with a daily listening limit, while the Pro plan removes usage limits and unlocks premium features such as private voice cloning and full ebook support.
What platforms and services does CastReader integrate with?
CastReader integrates with Google Docs, Gmail, Notion, and major AI services like ChatGPT, Claude, and Gemini. It also works with Kindle Cloud Reader, WeRead, and O'Reilly in supported browsers.
Can CastReader explain difficult passages in my language?
Yes, the 'Read & Explain' feature summarizes complex or foreign-language passages and explains them in your preferred language while visually marking key points in the original text.
How do I get started with CastReader?
Users can start by installing the browser extension or downloading the mobile app. The tool provides guided paths for common use cases, such as reading webpages, PDFs, or Kindle books aloud, or explaining difficult passages.
CastReader traffic & engagement
castreader.com · third-party estimates from Similarweb
Data as of Sep 2026Full AI website ranking →
Monthly visits · Sep 202651K+32.8% MoM12-month high 51K (Sep 2026)
Rank among AI websites#2,656▲ 276 vs last monthof 8,649 tools on aitoolnavio™
Top marketUnited States73.6%Top 5 countries bring 85% of visits
Average visit28sTime on site per visit
Pages per visit1.44Average pages viewed
Bounce rate53%Leave after one page · lower is better
Similarweb global rank#783,855#304,374 in United States
Traffic trend
Last 4 months · grows by one month every month
- Jun 20262.7K
- Jul 20268.5K+212.1%
- Aug 202638K+351.7%
- Sep 202651K+32.8%
Where visitors come from
Share of visits by channel
No measurable traffic from Paid Referrals.
Top countries
Share of visits · estimated visits
Other countries: 15.1%
Visits sent by AI assistants
How people reach this site from other AI tools
953 a month · 1.9% of all visits
Compared with similar tools
Audio & Voice · Sep 2026
Traffic figures are third-party estimates, good for scale and trends; they can differ from a company's own numbers. Updated monthly.
