Comparison

Main Idea vs Readability

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

Head to head
About

Main Idea

This app helps children in grades 2-5 improve their reading comprehension by teaching them to identify the main idea of sentences. It uses a fun, game-like environment with step-by-step learning and a reward system to keep kids motivated.

Highlights
  • Step-by-step skill building
  • Incremental learning with unlocked levels
  • Frustration-free guided learning
  • Engaging reward center
  • Parental review and reporting
  • Over 600 examples
  • Timed levels for fluency
Features
Read full description

** Featured on Appolicious.com & iHeartThisApp.com ** 'Main Idea -Sentences' helps kids who have trouble with reading comprehension. Identifying the main idea is a key part of reading comprehension. 'Main Idea -Sentences' builds this comprehension skill in a fun, game-like environment. The skill is developed step-by-step until mastery. *** Happy Frog Apps is a Mom's Choice Award winner! *** ***** 5 Stars - Thank you for this app! Other software I’ve used has moved too quickly for my son. This one worked! Can’t wait for the next Main Idea app…it’s coming, right? ***** 5 Stars - This app is one the best education apps I have used with my little one. It really helps to improve his reading abilities. He is obsessed with passing the levels and it never let him disappointed. One of the few apps that worth to upgrade to premium version. 'Main Idea - Sentences' is designed for children in Grades 2-5 who can read the words, but don't understand what they read. Beginning readers in earlier grades can also benefit from the targeted skill development. 'Main Idea - Sentences' develops the skill of knowing what a sentence is about. This skill must be firmly established before a child can determine what a paragraph or page is about. Key Benefits: - Builds comprehension skills step-by-step until mastery. - Incremental learning. New levels are unlocked only when your child is ready. - Frustration-free learning. Your child will always be guided to the correct answer. - Fun and engaging Reward Center to increase motivation. - Easy parental review. Just check out the stars to see how your child is doing. - Contains over 600 examples, with content designed by professional teachers and researchers. - Advanced levels include timers to ensure fluency. Research shows fluency in the foundation skills is critical to reading comprehension. - Can be used independently (just hand it over: your child will know what to do!) or with a therapist/parent for reading intervention. - Provides extensive reporting for up to 10 students to suit the needs of parents, teachers and therapists. Our apps are designed for and tested by typical and special needs children. Testers include children with Autism and other special needs. Our apps work for them! This 'School Edition' app has no in-app purchases. To evaluate the app, download the free version, which has 4 free levels. Additional levels and additional players can be accessed with in-app purchase. If you prefer no in-app purchases, download the School Edition of this app. While you're thinking about reading, check out our other apps that target WH questions, inferencing and answer identification skills. Learn more about reading comprehension and research at our website www.HappyFrogApps.com. Drop us a note, we'd love to hear from you! We take customer service very seriously! If you ever have a problem or find that we've missed something, contact us at our website and we will do our best to fix the problem. We are a member of the Moms With Apps program that promotes privacy in children's apps. We collect NO private information in our apps and our apps do not allow unrestricted web access.

About

Readability

This app uses AI-powered voice technology to provide personalized reading tutoring for children. It listens as kids read aloud, offers pronunciation correction, and assesses comprehension through interactive questions. The app also builds vocabulary and allows parents to track progress.

Highlights
  • AI-powered voice recognition for reading practice
  • Real-time pronunciation correction
  • Interactive voice-based comprehension questions
  • Personalized vocabulary lists
  • Parent dashboard for progress tracking
  • Engaging grade-level stories with illustrations
Features
Read full description

Readability’s award-winning Smart Reading & Comprehension Learning App gives your child the effectiveness of 1-on-1 tutoring. Our breakthrough voice-based technology LISTENS while your child READS, highlighting, and correcting any problem words. Kids from kindergarten to 6th grade will improve their reading, vocabulary, and comprehension skills all in the convenience of a mobile app. IMPROVE READING WITH 1-ON-1 TUTORING Readability prompts your child to read aloud and listens while providing reading help and real-time pronunciation correction as your child reads. If they get stuck, they can tap on the speaker icon to have Readability read the selected passage or word aloud. Readability automatically selects the right reading material for each child to maximize improvement and minimize the reading struggle. Your child will be eager to learn as these fun and educational grade-level stories come to life with bright illustrations. IMPROVE CRITICAL THINKING SKILLS Our industry-first comprehension with Interactive Voice-based Questions & Answers (IVQA™) asks your child questions verbally about the story they just read to improve their critical thinking skills. Your child then is prompted to answer the question verbally to ensure they fully understand what they read. Comprehension is as important as reading fluency, we deliver both in our smart reading app for kids. IMPROVE VOCABULARY Readability makes it easy to learn new words and their meaning with a personalized vocabulary list for your child. Your child can long-press on any word while reading to learn its pronunciation, meaning, and add it to their vocabulary list. Their vocabulary list is neatly organized A-Z and by book to further practice, review, and perfect new or difficult words. SET AND TRACK READING GOALS Set goals and follow your child’s progress with your very own Parent Dashboard detailing what they have read, reading duration, accuracy, comprehension, and speed. It also provides daily and weekly reading reports for accountability that can be shared with a teacher. ENGAGING BOOKS A massive selection of age-appropriate stories and educational works keep kids engaged and learning. Readability is the perfect reading app for kids. Getting started is easy with a 30-day free trial. Just download the app to sign up for your free trial. Cancel anytime. SUBSCRIPTION TERMS To access all app features, please subscribe to the 30-day free trial. Your subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will automatically be charged at the subscription price for renewal, within 24-hours prior to the end of the current billing period. You can manage your subscription and/or turn off auto-renewal by visiting your Account Settings after purchase. • Visit https://www.readabilitytutor.com/payment-policy/ for payment terms • Visit https://www.readabilitytutor.com/terms-of-use/ for terms of use Copyright 2023 Readability

Screenshots

Main Idea4 screens
Readability4 screens

Verdict

The call

The clearest difference is price: Readability at Free against Main Idea's $6.99. Readability also leads on ratings volume (24K vs 6) and update cadence (fortnightly vs every 3 months). Main Idea's advantage is in-app purchases (none vs 2) and review sentiment (85% vs 56%). On 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

Readability is free to download; Main Idea costs $6.99 up front. Readability sells 2 in-app purchases, starting at $19.99 per month. Main Idea asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Readability holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Readability has 24K ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 85% of Main Idea's written reviews are positive against 56% of Readability's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Main Idea ships an update every 3 months, Readability fortnightly. The most recent releases landed on September 8, 2026 and September 24, 2026 respectively.

Scorecard9 real differences · 2 level
Main Idea versus Readability: the parameters behind the verdict, then further details
ParameterMain IdeaReadability
Price$6.99Free — better
Rating4.3 (6 ratings)4.6 (24K ratings) — better
Positive reviews84.6% of reviews — better55.9% of reviews
Number of ratings624K — better
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid — betterSubscription
Best chart rank—#185 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.2 — better15.1
Further details — not scored
Size22 MB264 MB
Age rating4+4+
DeveloperJanine Toolee4site Inc.

Customer experience

Main Idea

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews13 reviews
Positive84.6%
Neutral7.7%
Negative7.7%

Readability

All ratings23,740 ratings
Positive90.6%
Neutral4.0%
Negative5.4%
Written reviews358 reviews
Positive55.9%
Neutral9.8%
Negative34.4%

Bugs and requests

Main Idea

Not enough reviews yet to summarise bugs or requests.

Readability

Reported bugs

4 issues
  • App charges for free trial
  • Subscription cancellation issues
  • Inconsistent app behavior
  • Compatibility problems on some devices

Requested features

4 requests
  • More customization options for text and background
  • Improved voice recognition accuracy
  • Expanded book selection
  • Better comprehension testing

In-app purchases

None

Main Idea

No in-app purchases

2 purchases

Readability

Subscriptions2
  • Readability Tutor1 Month trial$19.991 Month
  • Readability Tutor Annual1 Month trial$139.991 Year

Questions

Is Main Idea free?
Main Idea costs $6.99, with no in-app purchases.
Is Readability free?
Readability is free to download, with in-app purchases available.
Which has better reviews, Main Idea or Readability?
Readability is rated higher. Main Idea averages 4.3 out of 5 from 6 ratings, while Readability averages 4.6 from 24K ratings.
Do Main Idea or Readability have ads?
Neither Main Idea nor Readability shows ads.
Which is updated more often, Main Idea or Readability?
Main Idea ships an update every 3 months, and Readability fortnightly. Most recently, Main Idea was updated on September 8, 2026 and Readability on September 24, 2026.

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