Official mobile stores
Install CastReader from the App Store on iPhone or from Google Play on Android, then keep the same reading habit on the phone you actually carry.
Kindle read aloud app for iPhone and Android
Listen to Kindle Books on iPhone and Android
CastReader turns your Kindle library into a mobile read-aloud experience: open your bookshelf, tap a book, press Read Aloud, and listen with synced highlighting, auto-scroll, resume progress, background or lock-screen playback, plus AI explanations when the text gets hard.
- Built around your Kindle library and long-form reading queue
- Available for iPhone and Android, with Google Play now live
- Synced highlighting keeps your eyes and ears on the same line
- Auto-scroll, preloading, and resume progress make long sessions feel smooth
- Background and lock-screen playback for commutes, walks, and chores
Real mobile app demo: bookshelf to book detail to Read Aloud with TTS, highlighting, auto-scroll, and mobile playback controls.
22s
real phone demo
App Store + Google Play
iPhone and Android
3 depths
overview, standard, deep
6 scenarios
books, papers, study, work
Android app now on Google Play
One Kindle listening flow across iPhone and Android
CastReader is no longer a browser-only workaround. The mobile app now supports smoother Kindle Read Aloud and Explain sessions with page preloading, better highlights, and native phone playback controls.
Smoother Kindle Read Aloud
Recent Android updates focus on smoother page turns, preloading, replay, multilingual text, and better highlights during Kindle-style listening.
Listen and explain
When a chapter gets dense, switch from read aloud into AI explanation for books, papers, reports, contracts, study notes, and technical material.
How Kindle Read Aloud Works in the App
A mobile-first flow for listening to books you already keep in your Kindle-style reading library.
1
Connect your Kindle library
Bring your Kindle reading flow into CastReader so your bookshelf becomes a listening queue.
2
Sync bookshelf
CastReader organizes books and reading items for mobile playback, progress, and later resume.
3
Open a book
Pick the title you want from the shelf and keep the original reading context visible.
4
Tap Read Aloud
Start natural TTS with controls for speed, voice, and progress.
5
Listen with highlighting
Follow synced highlights, auto-scroll through the book, and continue from the lock screen.
Built for Kindle Listening on Your Phone
The page is not just converted into audio. It stays readable, trackable, and easy to resume.
Mobile app playback
Use CastReader on iPhone or Android when you want Kindle books to behave like a personal audiobook queue.
Synced highlighting
Words and passages stay visually connected to the voice so you can read along, skim back, or refocus quickly.
Auto-scroll
The reading view moves with the audio instead of forcing you to keep nudging the page by hand.
Background and lock screen
Keep listening while the phone is locked or while you move between apps during a commute or walk.
Resume progress
Return to the same book and continue from where the listening session left off.
AI explanations
Switch from read aloud to guided explanation when a chapter, argument, term, or character relationship needs unpacking.
AI Explain, not just TTS
When a passage gets hard, CastReader can explain it
Plain text-to-speech pronounces the words. CastReader keeps the original text visible and helps you understand dense, foreign, technical, or literary passages as you listen.
Explain on the original page
Keep the book, PDF, or article in view while CastReader calls out the key idea instead of moving you into a detached audio file.
Tutor-style summaries
Use Overview, Standard, or Deep explanation depth for characters, arguments, formulas, terms, and difficult paragraphs.
Listen first, dig deeper when needed
Stay in read-aloud mode for easy sections, then ask for an explanation only when the text slows you down.
Why Not Just Kindle, Audible, or Plain TTS?
Option
What breaks
What CastReader adds
Kindle's native reading
Great for visual reading, but read-aloud availability depends on device, language, book support, and the exact Kindle surface.
A phone-first listening flow with highlights, scrolling, progress, and AI explanation layered around the reading session.
Audible
Only helps when a separate audiobook edition exists and you have access to it. It also separates listening from the page you were reading.
Lets your existing reading queue become listenable while preserving the original page context.
Plain text-to-speech
Reads text aloud but usually loses layout, progress, highlight synchronization, and long-session controls.
Combines TTS with synced highlighting, auto-scroll, mobile playback, resume progress, and AI explanations for hard passages.
Six Reading Scenarios
Kindle is the main doorway. The same mobile read-aloud and explanation system also handles documents, papers, and serious reading workflows.
Papers and Academic Reading
Listen to abstracts, methods, findings, and citations while asking CastReader to explain dense passages.
Inputs: URL, PDF, DOCX, EPUB, image, text
Depths: Overview for skim, Standard for section-level understanding, Deep for methods and claims
Explore this reading workflowBooks and Long-form
Turn novels, nonfiction, and saved long reads into sessions you can read, listen to, and resume.
Inputs: URL, PDF, DOCX, EPUB, image, text
Depths: Overview summary, Standard chapter explanation, Deep themes and character analysis
Explore this reading workflowReports and Business
Listen through reports, memos, market notes, and strategy docs while preserving the document structure.
Inputs: URL, PDF, DOCX, EPUB, image, text
Depths: Overview for decisions, Standard for key points, Deep for risks and assumptions
Explore this reading workflowContracts and Legal
Use audio plus explanation to slow down around obligations, exceptions, definitions, and risky clauses.
Inputs: URL, PDF, DOCX, EPUB, image, text
Depths: Overview for parties and terms, Standard for clause meaning, Deep for issue spotting
Explore this reading workflowStudy and Exam Prep
Convert readings into review sessions with listening, highlights, and explanation depth that matches your study goal.
Inputs: URL, PDF, DOCX, EPUB, image, text
Depths: Overview flash review, Standard concept pass, Deep step-by-step explanation
Explore this reading workflowManuals and Technical Docs
Listen to docs, specs, and manuals while preserving headings, instructions, and technical terms.
Inputs: URL, PDF, DOCX, EPUB, image, text
Depths: Overview map, Standard procedure explanation, Deep troubleshooting walkthrough
Explore this reading workflowVideo Transcript and Indexable Summary
The demo starts in the CastReader mobile app with a bookshelf. A reader opens a book from the library instead of searching for a separate audiobook edition.
The book detail screen leads into a Read Aloud action. CastReader starts TTS on the phone, keeps the original reading context visible, and highlights text as the voice reads.
During playback, the page advances with auto-scroll so the active passage stays in view. The experience is designed for long sessions where you may switch between reading and listening.
When you leave the app or lock the phone, playback can continue in the background. CastReader remembers progress so you can resume the book later without hunting for the paragraph again.
CastReader App FAQ
Can I listen to Kindle books on iPhone?
Yes. CastReader is designed for phone listening, including iPhone. Open your Kindle reading flow in CastReader, choose a book, tap Read Aloud, and listen with synced highlighting, auto-scroll, background playback, and resume progress.
Is CastReader available on Android?
Yes. CastReader is now available on Google Play for Android, so you can use the same Kindle read-aloud and explanation workflow on Android phones as well as iPhone.
Can I listen to Kindle books on Android?
Yes. Install CastReader from Google Play, open your reading flow, and use Read Aloud with highlighting, auto-scroll, background playback, and AI explanations.
Can Kindle books be read aloud?
Kindle read-aloud support varies by device, app, language, and book. CastReader provides a mobile read-aloud layer focused on listening to books from your library with highlighting and progress controls.
Does it work with my Kindle library?
CastReader is built around your existing reading library workflow. The goal is to let books you already keep in your Kindle shelf become listenable on your phone without starting from a separate audiobook catalog.
Is CastReader affiliated with Amazon or Kindle?
No. CastReader is not affiliated with Amazon or Kindle. Amazon and Kindle are trademarks of Amazon.com, Inc. or its affiliates.
Can it play in the background?
Yes. The mobile experience is designed for background and lock-screen listening so you can continue during commutes, walks, chores, or study breaks.
Does it highlight words while reading?
Yes. CastReader keeps audio and text synchronized with visible highlighting and auto-scroll so you can follow the original reading position.
Can it explain books and papers?
Yes. CastReader supports Overview, Standard, and Deep explanation modes for books, papers, reports, contracts, study materials, manuals, and technical docs.
Does it replace Audible?
No. Audible is professionally produced audiobook content. CastReader is for listening to reading material you already have, while keeping the original text, highlights, scrolling, and explanation tools available.
Internal Reading Paths
Kindle Cloud Reader troubleshooting
Fix cases where Kindle Cloud Reader is not reading aloud.
EPUB to audio reader
Read EPUB books aloud with mobile-friendly listening.
PDF to audiobook
Turn PDFs into structured audio sessions.
Read with AI
Listen, summarize, and explain long documents.
Text to speech for students
Study with TTS, highlighting, and explanation.
Listen to Claude
Hear AI responses aloud with inline controls.
Start Kindle Read Aloud on iPhone or Android
Download CastReader, open your Kindle reading queue, and turn long books into mobile listening sessions with highlights, AI explanations, and resume progress.
CastReader is not affiliated with Amazon or Kindle. Amazon and Kindle are trademarks of Amazon.com, Inc. or its affiliates.
Listen on Your Phone
Download the CastReader app to listen to your uploaded documents anywhere.
Use CastReader on every reading surface
Start with the mobile app for Kindle listening, then keep Chrome, iOS, and Android connected for PDFs, web pages, docs, long-form reading, and AI explanations.
Any website· Kindle / Google Docs / Notion· PDF / EPUB / DOCX· 40+ languages
Official App Store and Google Play downloads · Chrome and Edge extension