CastReader — Read Aloud + AI Explain for Kindle, Articles, PDFs

Read aloud with synced highlight + AI Explain that annotates any page. Kindle, PDFs, articles & books. 100+ AI voices.

CastReader does two things for long-form reading — and they work together: 🎧 **Read Aloud** — reads any long webpage, book, or PDF out loud while a paragraph-level highlight follows along and the page auto-scrolls. Your eyes and ears stay locked on the same line, like a teacher pointing at every word. Built to beat distraction — not to replace your eyes. ✍️ **AI Explain** — goes beyond reading: it marks up the page like a teacher with a highlighter. It circles the key claim, underlines what matters, drops handwritten margin notes, and walks you through the logic — right on top of the original article. Passive scrolling becomes guided understanding. Two features, one purpose: actually finish — and understand — the long stuff you keep meaning to read. --- ### Read Aloud works where most TTS extensions break 📚 **Kindle Cloud Reader** — read entire books with reliable auto page-turn (across 30+ regional storefronts: read.amazon.com / .co.uk / .co.jp / .de / .fr / .in / .com.br / etc.). Handles Kindle's blob image rendering — the reason most TTS extensions fail on Kindle. 🇨🇳 **微信读书 (WeChat Read)** — canvas-rendered books that block ordinary text extractors. CastReader reads them naturally, with auto chapter advance. 📄 **Online documents & collaborative tools** — long documents in iframe-heavy editors other TTS extensions can't reach. 🤖 **AI chat tools** — listen to long AI responses while you do something else. Works with every major AI assistant chat interface. 🌐 **Long blogs, Medium, Substack, Wikipedia, news, PDFs, Reddit threads** — anywhere long-form reading happens. ✂️ **Selected text** — highlight any passage on any page → click 🎧 → instant read aloud. ### What makes Read Aloud different ✓ **Paragraph-level highlight, not word chaos.** Most TTS extensions blink one word at a time and you lose the context. CastReader highlights the whole paragraph so you can scan ahead and back — like reading along with a teacher's finger. ✓ **Auto-scroll keeps the current line visible.** Long articles flow on their own — set it and look away. ✓ **Auto page-turn on Kindle and WeChat books.** Entire books play through without a single tap. ✓ **Resume where you left off.** Reload the page or walk away mid-chapter — it picks back up. ✓ **9 languages auto-detected from content, not page UI.** English, Chinese, Spanish, Portuguese, Japanese, Korean, French, German, Hindi. Reading a Chinese post while logged into an English account? CastReader picks the Chinese voice anyway. ✓ **100+ natural voices**, adjustable speed, switchable per language. No "robot voice" complaints. ### What AI Explain adds ✓ **Marks up the original page.** Circles, underlines, highlights and numbered cues land right on the sentences they refer to — in handwriting that stands apart from the printed text, so you see at a glance what's the original and what's the guide. ✓ **Explains the logic, not just the words.** A short narration walks you through what each part means and why it matters. ✓ **Works on the same hard platforms** — Kindle, WeChat books, articles, PDFs, your own uploads. ## Built for these readers → Long-form readers who keep losing focus mid-article → Students absorbing dense readings or research papers → ESL learners hearing pronunciation while reading → ADHD / dyslexic readers needing dual-channel focus → Knowledge workers reading 100K+ char AI responses → Anyone with a Kindle backlog they actually want to finish ## How it compares to other TTS extensions 📚 Reliable on Kindle Cloud Reader — only CastReader 🇨🇳 Works on canvas-rendered books (微信读书) — only CastReader ✏️ Paragraph-level highlight — CastReader / Most others: word-only blink 📖 Auto page-turn through entire books — only CastReader 🧠 AI Explain that annotates the page — only CastReader 🌐 Content-based language detection — CastReader / Most others: UI-based (wrong on multilingual sites) ## Pricing Free to start — no account needed to try both Read Aloud and AI Explain. Upgrade to Pro to unlock more listening time, 100+ premium voices, faster speeds, and unlimited AI Explain. No ads, ever. Anonymous device-level usage analytics with opt-out in settings; full disclosure at castreader.ai/en/privacy-policy . ## Why this exists Built by indie devs tired of paying monthly fees for read-aloud tools that broke exactly where we read most — Kindle's blob image rendering, WeChat's canvas books, iframe-nested docs, AI streaming responses. CastReader is built to make long-form reading on those platforms actually work — and now to help you understand it, not just hear it. Install takes 5 seconds; uninstall in one click. --- Bonus (1.1.5+): click 📺 on any reading page and the same TTS pipes into a 9:16 vertical overlay with looping gameplay video and TikTok-style subtitles. Built as a one-day joke; genuinely improved finish rates. Privacy:https://castreader.ai/en/privacy-policy