KO Reader 1.0

KO Reader turns web articles, ebooks, and PDFs into natural-sounding speech -- entirely on your device. No cloud, no tracking, no subscriptions.
Paste a URL or open an EPUB or PDF, and KO Reader reads it aloud with a neural AI voice. Everything runs locally, so your reading stays private and works anywhere -- on the train, on a plane, or off-grid. Export your favorite articles or books to m4a or m4b files.

WHAT YOU CAN READ

o Web articles -- Wikipedia, news sites, blogs, and Substack
o Fanfiction -- Archive of Our Own, Royal Road, and Wattpad, with chapter detection
o EPUB ebooks with full chapter navigation
o PDF documents
o Plain text -- paste or type any content
o Safari Share Extension -- send articles to KO Reader with one tap

NATURAL AI VOICES

o 53 neural voices across 9 languages: American and British English, Spanish, French, Italian, Portuguese, Japanese, Mandarin, and Hindi
o Preview any voice before selecting it
o Mark favorites for quick access
o Playback speed from 0.5x to 2.0x
o Smart heteronym resolution -- the voice knows the difference between "lead" (the metal) and "lead" (to guide), "wound" (injury) and "wound" (past of wind)
o Custom pronunciation dictionary -- teach the reader how to say names, jargon, or anything you like

READ YOUR WAY

o Reading queue -- line up multiple articles and auto-advance
o Bookmarks -- save passages to come back to
o Reading history -- pick up where you left off, across books and articles
o Chapter pre-generation -- book chapters start instantly, no waiting between them
o Audio export -- save generated audio for offline listening
o Adjustable article font (system, serif, monospaced, rounded) and Dynamic Type support

BUILT FOR ACCESSIBILITY

o Full VoiceOver support with labeled controls throughout
o Haptic feedback on transport controls and sleep timer
o Background audio -- listen while you use other apps or with the screen off
o Sleep timer -- stops playback when you drift off
o Works with AirPods, Bluetooth speakers, and CarPlay

RUNS EVERYWHERE

o Universal app for iPhone, iPad, and Mac
o macOS keyboard shortcuts (Space to play/pause, Cmd+ to skip)
o Optimized for Apple Silicon with optional CoreML acceleration
o Adjustable CPU thread count for performance tuning

PRIVACY FIRST

o 100% on-device TTS -- your content never leaves your phone
o No accounts, no analytics, no tracking, no ads
o No internet required after the one-time model download
o Reading progress stored locally only

KO Reader downloads a ~350 MB neural voice model on first launch. After that, everything works fully offline.

Powered by the open-source Kokoro TTS model (Apache 2.0).

License: Commercial