Comparison

Text to Speech Reader vs Koto AI Reader

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

Head to head
About

Text to Speech Reader

This app converts text from various sources into natural-sounding audiobooks. It supports numerous file formats, offers advanced AI voices in multiple languages, and includes features like word-by-word highlighting and text summarization to enhance comprehension and save time.

Highlights
  • Convert text to audiobooks with AI voices
  • Supports PDFs, web articles, and scanned documents
  • 120+ natural-sounding voices in 27 languages
  • Word-by-word text highlighting
  • Summarizes text and extracts keywords
  • Adjustable speech rate
  • Personal reading habit tracker
Features
Read full description

Your fastest reading companion! Read aloud everything with natural AI voices! ReadBit is a free text-to-speech reader that helps you to read aloud books, PDFs, docs, web articles and many other file formats. It saves a lot of time by instantly converting any text to an audiobook, reading all the information at your desired speech rate and providing an excellent listening experience with natural lifelike voices. Features - Convert text files to audiobooks with advanced text-to-speech in 27 languages - Supports websites, ePub, pdf, jpg, png and more - Scan physical documents with your camera and listen - Amazing listening experience with more than 120 voices - No more robotic voices! Listen to everything with the most natural voices in the market - Text reader highlights the document word by word as it reads to enhance engagement and comprehension - Summarizes text and extracts valuable insights such as keywords, places, and characters across chapters - Change the speech rate. Listen faster! - Track your progress with a personal reading habit tracker A Free Text to Speech (TTS) Reader Text-to-speech is an amazing technology that converts all text into audiobooks, whether it’s an online book, a pdf, a school assignment, or a lengthy report. Read Aloud Books, PDFs and Websites with Natural AI Voices Driving? Or maybe taking a long walk? Listen to your books and web articles with natural, lifelike voices using our cutting-edge text-to-speech reader. Reading Coach Strong habits start with small steps! Reading Coach is a tool that serves your document in bites like IG stories, tailored for your daily reading time. We call them Bits, and they make reading easier and more fun than ever! Create Playlists Create a list of your favorite blog posts, articles, books, or pdf and take them with you anywhere you go! You can create playlists to listen to your files back-to-back in your preferred order. Highlight and Focus The text reader highlights every word while reading out loud. You can scan physical documents and books to read along while listening. Highlighting the text increases your focus and helps you retain more information than just reading. Need a spell checker? Do you know what is one of the best things about a text-to-speech reader? You can use it as a spell checker. ReadBit will convert your file from text to speech, pronounce every word, and let you spot any misspelled words instantly. Summarize and Save Time ReadBit is not only a text reader but also a summarizer. It digs out the most relevant information like keywords, characters, and places. ReadBit is developed by Mediate, an MIT spinoff AI start-up based in Boston. As Mediate, we develop innovative computer vision systems with the support of the National Science Foundation and the US Department of Veterans Affairs. Subscription Plans: ReadBit has limited access to some advanced features such as Natural Voices, Font Adjustments and Keywords. If you would like unlimited access, we have created subscription plans. 1 Month: $11.99 6 Month : $59.99 ~ $9.99/month 12 Months: $95.99 ~ $7.99/month If you choose to purchase a subscription plan, the payment will be charged to your iTunes Account at confirmation of purchase. All plans automatically renew unless auto-renew is turned off at least 24-hours before the end of the current period. Auto-renew may be turned off by going to your iTunes Account Settings after purchase. The account will be charged for renewal within 24-hours before the end of the current period. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. If you don't choose to purchase a plan, you can simply continue using designated ReadBit features for free. You can read our Terms of Service and Privacy Policy from here: https://mediate.tech/policies

About

Koto AI Reader

Transform any text into lifelike, natural-sounding speech instantly. This app converts PDFs, documents, web content, and even photos of text into audio. Optimize your learning, multitask, and make content accessible on the go with high-quality voice generation in over 50 languages.

Highlights
  • AI voice generation
  • Convert PDFs and documents to audio
  • Read aloud web content
  • Photo to audio conversion
  • Supports over 50 languages
  • Natural-sounding voices
Features
Read full description

Turn any text into lifelike voice instantly. Fast, easy, and ready in seconds. Your words come alive. Transform text into natural speech with Koto AI Reader. Our cutting-edge AI voice generator turns any written content into remarkably natural speech. Whether you're working through a lengthy PDF, catching up on documents, or want to listen to your own writing, Koto AI brings text to life with incredibly human-like voices. From professional reports to academic papers, Koto AI's voice generation technology adapts to any content type, delivering crystal-clear audio that sounds genuinely human. Simply input your text, upload your documents, or snap a photo — our AI does the rest. Our voice AI creates audio that captures natural speech patterns, intonation, and rhythm, making listening a truly engaging experience. Whether you're a busy professional, student, or anyone looking to optimize their reading time, high-quality audio is now at your fingertips. Turn your PDFs, Word documents, and text into audio for: - Accelerated learning and information absorption - Multitasking while consuming content - Making documents accessible on-the-go - Enhanced comprehension and retention Turn Photos into Audio: - Take a photo of any book page and start listening instantly - Capture printed documents and hear them read aloud - Snap a picture of your computer screen to convert text to speech - Choose from multiple natural-sounding voices Koto AI supports over 50 languages with stunning voice quality. Koto AI's intuitive interface ensures a smooth, user-friendly experience. Simply type, upload, and listen — experience your content in a whole new way. Join the Reading Revolution: Download Koto AI today and start transforming your documents into natural speech. Your personal audiobook awaits. Privacy policy: https://elvetech.io/privacy EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Text to Speech Reader4 screens
Koto AI Reader4 screens

Verdict

The call

The clearest difference is review sentiment: Text to Speech Reader at 74% against Koto AI Reader's 34%. Text to Speech Reader also leads on device support (3 vs 1). Koto AI Reader's advantage is rating (4.5 vs 4.3) and update cadence (every 2 weeks vs every 3 weeks). On price, ratings volume, ads and in-app purchases 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

Both are free to download. Text to Speech Reader sells 8 in-app purchases, starting at $5.99 per 7 days and Koto AI Reader sells 8 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Koto AI Reader holds the better App Store score, 4.5 against 4.3. Both are backed by a comparable volume of ratings — 240 and 154 respectively. Written reviews complicate that: 74% of Text to Speech Reader's written reviews are positive against 34% of Koto AI Reader's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Text to Speech Reader ships an update every 3 weeks, Koto AI Reader every 2 weeks. The most recent releases landed on October 31, 2026 and October 22, 2026 respectively.

Scorecard4 real differences · 6 level
Text to Speech Reader versus Koto AI Reader: the parameters behind the verdict, then further details
ParameterText to Speech ReaderKoto AI Reader
PriceFreeFree
Rating4.3 (240 ratings)4.5 (154 ratings) — better
Positive reviews73.9% of reviews — better33.9% of reviews
Number of ratings240 — better154
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Vision Pro — betteriPhone
Requires iOS17.016.0 — better
Further details — not scored
Size51 MB43 MB
Age rating4+9+
DeveloperVirtual Collaboration Research Inc.Elve Tech

Customer experience

Text to Speech Reader

All ratings240 ratings
Positive82.5%
Neutral5.8%
Negative11.7%
Written reviews115 reviews
Positive73.9%
Neutral8.7%
Negative17.4%

Koto AI Reader

All ratings157 ratings
Positive87.3%
Neutral4.5%
Negative8.3%
Written reviews56 reviews
Positive33.9%
Neutral14.3%
Negative51.8%

User reviews

Text to Speech Reader

From 240 App Store ratings

What we love

  • 🎙️ Natural, human-like AI voices
  • 👍 Free version with good functionality
  • 📚 Excellent for students and dyslexic readers
  • 🚀 Fast reading speed and multitasking capability
  • 📱 User-friendly interface and easy to use

Room to improve

  • 🐛 Frequent crashes and freezing
  • ⏸️ Random pausing and stopping during playback
  • 📄 Poor handling of PDFs and documents with images
  • 🔤 Skips words, sentences, and entire paragraphs
  • 💰 Expensive subscription model

Koto AI Reader

From 154 App Store ratings

What we love

  • ✨ Brilliant app
  • 🎶 Amazing music generation
  • 🎤 Generates songs and sings
  • 👍 Easy to use
  • 💡 Revolutionary app

Room to improve

  • 💸 Too expensive
  • ⏳ Insanely long waiting times
  • 📉 Usage throttled
  • ❌ Not working
  • 🚫 No free trial

Bugs and requests

Text to Speech Reader

Reported bugs

14 issues
  • App crashes when opening or loading large libraries
  • Random data loss and document disappearance
  • Text syncing issues causing data to vanish
  • OCR misreads words and scrambles sentence order
  • App freezes when adding multiple books
Show 9 more
  • Playback stops or pauses unexpectedly
  • Login/logout loops and session disconnections
  • Scanner fails with multi-column text and images
  • Electronic humming sound when slowing playback speed
  • Reads content in brackets and parentheses despite settings
  • Doesn't recognize text on certain websites
  • Incompatibility with older iPhone models
  • In-app feedback form non-functional
  • App doesn't respond to language selection changes

Requested features

12 requests
  • One-time lifetime purchase option instead of subscription
  • Offline download capability for entire books
  • Chrome browser extension
  • Custom pronunciation settings for character names
  • Option to skip footnotes, page numbers, and citations
Show 7 more
  • Default voice selection feature
  • Ability to edit scanned text
  • Better margin crop functionality
  • Ignore brackets/parentheses option
  • Share playlists with friends
  • Automatic language detection
  • Improved Turkish and non-English voice quality

Koto AI Reader

Reported bugs

20 issues
  • App just buffering
  • Saved library deleted
  • Only 1/3 of voices remain
  • Can't generate anything
  • Not responding
Show 15 more
  • Buffering
  • Keeps on buffing
  • Something went wrong
  • Error message
  • Error code 0
  • Constant error message
  • App won't compose tune
  • Error message keeps occurring
  • App not working
  • Connection error
  • App fails to complete compositions
  • Stops abruptly
  • Error message when generating song
  • Doesn't load
  • Wants you to pay after 2 attempts

Requested features

11 requests
  • Add option to edit lyrics
  • Preserve voice and music when editing
  • Option to reuse specific tunes
  • Allow choosing a melody
  • Accompaniment without voice
Show 6 more
  • Extend song length
  • Use my voice for song production
  • Allow more than 2 verses
  • No cooldown after payment
  • Monthly subscription option
  • More input for AI effectiveness

In-app purchases

8 purchases

Text to Speech Reader

Subscriptions4
  • Weekly Premium$5.997 Days
  • Monthly Premium$11.991 Month
  • 6 Months Premium$59.996 Months
Show 1 more
  • Yearly Premium$95.991 Year
One-time4
  • 50.000 Words$14.99
  • 75.000 Words$19.99
  • 150.000 Words$19.99
Show 1 more
  • 150.000 Words$29.99
8 purchases

Koto AI Reader

Subscriptions8
  • Full Access$6.997 Days
  • Full Access7 Days trial$14.991 Month
  • Full Access$14.991 Month
Show 5 more
  • Full Access3 Days trial$14.991 Month
  • Full Access$49.993 Months
  • Full Access7 Days trial$59.991 Year
  • Full Access$59.991 Year
  • Full Access$99.991 Year

Questions

Is Text to Speech Reader free?
Text to Speech Reader is free to download, with in-app purchases available.
Is Koto AI Reader free?
Koto AI Reader is free to download, with in-app purchases available.
Which has better reviews, Text to Speech Reader or Koto AI Reader?
Koto AI Reader is rated higher. Text to Speech Reader averages 4.3 out of 5 from 240 ratings, while Koto AI Reader averages 4.5 from 154 ratings.
Do Text to Speech Reader or Koto AI Reader have ads?
Neither Text to Speech Reader nor Koto AI Reader shows ads.
Which is updated more often, Text to Speech Reader or Koto AI Reader?
Text to Speech Reader ships an update every 3 weeks, and Koto AI Reader every 2 weeks. Most recently, Text to Speech Reader was updated on October 31, 2026 and Koto AI Reader on October 22, 2026.

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