Koe Reader: AI Book Narrator
Turn books into natural audio
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Listen to EPUBs and PDFs with private on-device narration. On supported devices, ask Koe to explain or simplify difficult passages.
Turn any EPUB or PDF into something you can read, listen to and understand
Koe Reader creates natural-sounding narration directly on your iPhone. There’s no account, subscription, advertising or cloud upload. Your books, highlights, reading progress and generated audio stay on your device.
READ AND LISTEN TOGETHER
Move naturally between reading and listening. Koe follows your position, highlights the sentence being spoken and lets you continue exactly where you stopped.
UNDERSTAND DIFFICULT PASSAGES
On supported Apple Intelligence devices, highlight text and ask Koe to explain it, summarize the argument, define difficult terms or identify the key idea.
You can also simplify dense writing at different levels. The clearer version appears inside the book as you read, and you can restore the original whenever you want.
NATURAL ON-DEVICE NARRATION
Choose from a collection of distinct narrators, adjust playback speed up to 2× and keep listening with smooth, pre-generated audio. Focus Mode dims the surrounding text so you can follow the active sentence without distraction.
PRIVATE BY DESIGN
Narration and supported reading intelligence features run on your device. Your documents are not uploaded to external servers for processing.
MADE FOR REAL BOOKS
Koe improves EPUB headings, quotations and chapter spacing while preserving the character of the original book. Search for words or entire pasted passages, save highlights and quickly return to moments worth remembering.
FEATURES
• Import EPUB and PDF documents
• Natural on-device AI narration
• Multiple narrator voices
• Ask questions about selected passages
• Simplify difficult writing at different levels
• Synced sentence highlighting
• Focus Mode for distraction-free listening
• Adjustable playback speed up to 2×
• Smooth narration with audio prepared ahead
• Book and chapter progress
• Search across words and longer passages
• Bookmarks and highlights
• Background playback
• Light, dark and system appearance
• No account, subscription or advertisements
Whether you’re working through a difficult nonfiction book, revisiting a novel or listening while travelling, Koe helps you stay inside the story.
Import a book, press play and keep reading wherever you go.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Meet a smarter, smoother Koe Reader.
• Ask Koe questions about selected passages
• Simplify difficult writing at your preferred level
• Improved context-aware explanations and summaries
• Smoother narration with more audio prepared ahead
• Ten distinct narrator voices with new portraits
• Focus Mode and animated sentence highlighting
• A redesigned, adaptive glass player
• Better EPUB formatting and long-passage search
• Improved highlights, progress tracking and dark mode
• A completely new Koe app icon
Ask Koe and Simplify require a supported Apple Intelligence device.
The developer, Oluwaseun Olaoya, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Oluwaseun Olaoya
- Size
- 410.6 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Jimi Olaoya