CastReader - 2026 Pricing, Features, Reviews & Alternatives

CastReader is a browser extension that converts written web content into audio format through natural artificial intelligence voices. It functions as an accessibility and productivity tool for the consumption of web articles, e-books, documents and AI-generated responses. The software targets students, researchers, professionals, language learners and individuals with reading disabilities such as dyslexia and ADHD who require alternative methods for engaging with digital text across diverse platforms.

The extension extracts text from any webpage and renders speech with real-time paragraph highlighting that synchronizes visual and audio content for continuous engagement. A feature called Quickread provides explanatory summaries and translations so that content in one language appears in a preferred language across more than forty supported languages. For e-book content on platforms such as Kindle Cloud Reader, WeRead and O Reilly, the extension uses optical character recognition to extract text from protected pages and supports automatic page turning for uninterrupted playback. A send to phone function transfers audio playback to mobile devices via Telegram for on-the-go listening.

For AI platform integration, playback buttons appear next to individual responses on ChatGPT, Claude, Gemini, DeepSeek, Kimi and Doubao so that a single answer can be heard without manual selection. Integration with document and email services such as Google Docs, Gmail, Notion, Feishu Docs and Yuque adds listen buttons to document titles and email subjects. Word-level highlighting follows each spoken word to assist proofreading and content review. A universal selection feature enables any text on any webpage to be highlighted and read aloud with automatic language detection determining the appropriate voice.

The extension operates entirely within the browser without authentication or usage limits. It functions across Chromium-based browsers and supports Firefox with Safari compatibility in development. Text extraction and voice synthesis are performed locally without transmission of user data to external servers. Automatic language detection and native voice selection are applied based on content language during playback.