Comparison

Fox Reader vs KO Reader

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Fox Reader

Transform your personal library into lifelike audiobooks with on-device AI narration. Read along word-by-word, get instant chapter summaries, and track your reading habits. All your books and notes stay private on your device.

Highlights
  • On-device AI audiobook narration
  • Offline listening
  • Word-by-word synchronized reading
  • AI chapter summaries
  • Customizable reading themes and fonts
  • Highlighting, notes, and vocabulary builder
  • Reading progress tracking and goal setting
  • Automatic library organization
Features
Read full description

Fox Reader turns ANY BOOK you own INTO a lifelike AUDIOBOOK, ENTIRELY OFFLINE on your iPhone. Import an EPUB, PDF, or MOBI, press play, and listen in natural, expressive voices. No cloud. No account. Nothing leaves your device. It's a real reader, too: follow every word as it's spoken, study what you read, and track the habit, all in a beautiful library that's yours alone. LISTEN TO ANY BOOK, OFFLINE Lifelike, on-device AI narration for anything you import. Choose from multiple expressive voices and listen anywhere your iPhone goes: car speakers, AirPods, or a walk with no signal. No streaming, no buffering, no internet required. FOLLOW ALONG, WORD BY WORD Every line highlights in sync with the narration, so reading and listening reinforce each other. Ideal for learning a new language, building comprehension, supporting dyslexia or ADHD, or simply keeping your place when you glance down. Fox automatically skips tables of contents, front matter, and decorative clutter, so you only hear the story. CATCH UP WITH AI SUMMARIES Lost the thread? Fox generates instant 3-bullet recaps of the last few pages, your current chapter, or the chapter you just finished: so you can jump back in within seconds. A READER DESIGNED AROUND YOU Eight hand-crafted themes, including Sepia, Dark, Forest, and Twilight. Fine-tune fonts, sizes, weights, line spacing, margins, and alignment. Smooth page-curl animations and orientation lock round it out. HIGHLIGHTS, NOTES & VOCABULARY Highlight passages in six colors and attach notes to any range of words. Save words to a personal vocabulary list, then make them stick with five AI word games: Quiz, Puzzle, Hangman, Word Guess, and Riddle Rush. SEE YOUR READING GROW Every reading and listening session is tracked. Set daily and yearly goals, build streaks, and watch a 14-day activity chart with breakdowns by author and format. A LIBRARY THAT ORGANIZES ITSELF Build custom collections with emojis and pin favorites to your Home Screen. Smart collections auto-group your books: Currently Reading, Almost Finished, Short Reads, Long Reads, and more — while AI genre classification sorts the rest for you. TRACK SERIES & DISCOVER MORE Follow multi-book series from start to finish, keep a wishlist of books you haven't imported yet, and find new titles from authors you already love. Import your Goodreads library by CSV. SYNC ACROSS YOUR DEVICES Your library, reading progress, highlights, notes, and preferences move with you over iCloud. Start a chapter on iPhone, finish it on iPad, exactly where you left off. PRIVATE BY DESIGN The neural voices, AI summaries, and genre sorting all run on your device — not on a server. No account, no tracking, no uploads. Your books and your notes stay yours. SUPPORTED FORMATS EPUB · PDF · MOBI · TXT. Import from Files, email, iCloud Drive, or any document source. Your whole library, in your ears: and nothing leaves your phone. Download Fox Reader and press play. Privacy Policy: https://salmanahmad09.github.io/SalmanApps/privacy.html Terms of Use: https://salmanahmad09.github.io/SalmanApps/terms.html

About

KO Reader

This app transforms web articles, ebooks, and PDFs into natural-sounding speech using on-device AI. Enjoy private, offline listening with customizable voices and playback speeds. Export audio for later or read anywhere without an internet connection.

Highlights
  • On-device text-to-speech
  • Supports web articles, EPUB, PDF, and plain text
  • 53 neural voices in 9 languages
  • Customizable playback speed
  • Audio export to m4a/m4b
  • Offline functionality
  • Privacy-focused, no tracking
Currently charting
Read full description

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 • Web articles — Wikipedia, news sites, blogs, and Substack • Fanfiction — Archive of Our Own, Royal Road, and Wattpad, with chapter detection • EPUB ebooks with full chapter navigation • PDF documents • Plain text — paste or type any content • Safari Share Extension — send articles to KO Reader with one tap NATURAL AI VOICES • 53 neural voices across 9 languages: American and British English, Spanish, French, Italian, Portuguese, Japanese, Mandarin, and Hindi • Preview any voice before selecting it • Mark favorites for quick access • Playback speed from 0.5x to 2.0x • Smart heteronym resolution — the voice knows the difference between "lead" (the metal) and "lead" (to guide), "wound" (injury) and "wound" (past of wind) • Custom pronunciation dictionary — teach the reader how to say names, jargon, or anything you like READ YOUR WAY • Reading queue — line up multiple articles and auto-advance • Bookmarks — save passages to come back to • Reading history — pick up where you left off, across books and articles • Chapter pre-generation — book chapters start instantly, no waiting between them • Audio export — save generated audio for offline listening • Adjustable article font (system, serif, monospaced, rounded) and Dynamic Type support BUILT FOR ACCESSIBILITY • Full VoiceOver support with labeled controls throughout • Haptic feedback on transport controls and sleep timer • Background audio — listen while you use other apps or with the screen off • Sleep timer — stops playback when you drift off • Works with AirPods, Bluetooth speakers, and CarPlay RUNS EVERYWHERE • Universal app for iPhone, iPad, and Mac • macOS keyboard shortcuts (Space to play/pause, Cmd+← and Cmd+→ to skip) • Optimized for Apple Silicon with optional CoreML acceleration • Adjustable CPU thread count for performance tuning PRIVACY FIRST • 100% on-device TTS — your content never leaves your phone • No accounts, no analytics, no tracking, no ads • No internet required after the one-time model download • 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).

Screenshots

Fox Reader4 screens
KO Reader4 screens

Verdict

The call

The clearest difference is price: Fox Reader at Free against KO Reader's $3.99. Fox Reader also leads on rating (5.0 vs 3.7). KO Reader's advantage is in-app purchases (none vs 3) and chart position (#5 vs unranked). On ratings volume, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Fox Reader is free to download; KO Reader costs $3.99 up front. Fox Reader sells 3 in-app purchases, starting at $4.99 per month. KO Reader asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Fox Reader holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 3 respectively.

Scorecard6 real differences · 5 level
Fox Reader versus KO Reader: the parameters behind the verdict, then further details
ParameterFox ReaderKO Reader
PriceFree — better$3.99
Rating5.0 (3 ratings) — better3.7 (3 ratings)
Positive reviews—66.7% of reviews
Number of ratings33
Update frequencyEvery 5 weeks—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank—#5 — better
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS26.218.6 — better
Further details — not scored
Size390 MB26 MB
Age rating4+4+
DeveloperSalman AhmadJames Carrell II

Customer experience

Fox Reader

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

KO Reader

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

3 purchases

Fox Reader

Subscriptions3
  • Monthly7 Days trial$4.991 Month
  • Yearly Discounted7 Days trial$11.991 Year
  • Yearly7 Days trial$29.991 Year
None

KO Reader

No in-app purchases

Questions

Is Fox Reader free?
Fox Reader is free to download, with in-app purchases available.
Is KO Reader free?
KO Reader costs $3.99, with no in-app purchases.
Which has better reviews, Fox Reader or KO Reader?
Fox Reader is rated higher. Fox Reader averages 5.0 out of 5 from 3 ratings, while KO Reader averages 3.7 from 3 ratings.
Do Fox Reader or KO Reader have ads?
Neither Fox Reader nor KO Reader shows ads.

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