Readability Learn How to Read: iPhone vs Android
Readability Learn How to Read gets 1k+ downloads a day worldwide (AppInsider estimate, October 2026, rounded down to a band).
Readability Learn How to Read by e4site Inc. is on both the App Store and Google Play. Here are both versions together: downloads, users, revenue, ratings and chart positions, store by store with totals.
Rating
4.4 ★
4.8k ratings, both stores
Measured
Best rank now
#23
Android · 
Family Grossing
Family GrossingMeasured
App Store
App details
App ID
1477213383
Publisher
Visionaire dba e4Site Inc
Publisher country
United States
On the store since
Oct 2022
4 years on the store
Minimum OS
iOS 16.4+
iPhone 8 and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
296 MB
Google Play
App details
App ID
com.readability.androidapp
Publisher
E4site, Inc.
Publisher country
United States
Content rating
Everyone
Readability Learn How to Read downloads & installs
Both stores, worldwide. Bands are open; exact numbers are free with an account.
| Store | Downloads / day | Lifetime installs |
|---|---|---|
| iPhone | 500+ | 1M+ |
| Google Play | 100+ | 100k+ Measured |
| Total | 1k+ Confidence | 1M+ Confidence |
How this is calculated
iPhone: chart positions and rating growth per country, anchored on its own Android downloads; lifetime from ratings worldwide × installs per rating. Google Play: the daily change in its exact install count. The total adds every store.
Where Readability Learn How to Read's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend before Apple and Google take their fee.
| Store | Per day | Per month | Share |
|---|---|---|---|
| App Store | |||
| Google Play | |||
| Total | Confidence | 100% |
Business model: Subscription-led
How Readability Learn How to Read makes money: subscriptions, one-off purchases and ads.
SubscriptionsIn-app purchases
Subscriptions
/mo
of revenue
Top in-app purchases · App Store US, most popular first
| 1 | Readability Tutor subscription | |
| 2 | Readability Tutor Annual subscription |
Where it ranks now
Both stores, across every country we track.
Ratings
Both stores. Store data, measured.
| Store | Rating | Ratings |
|---|---|---|
| App Store | 4.6 ★ | 749 |
| Google Play | 4.4 ★ | 4k 471 written reviews |
| Both stores | 4.4 ★ weighted by ratings | 4.8k |
What users say about Readability Learn How to Read
From the 112 most recent Google Play reviews in the US.
Mixed (44% of recent reviews give 4–5 stars). People like it for good value, and being useful. The main complaints are about price and subscriptions, and crashes and bugs.
What people like
- Price & subscription: “should not charge subscription”
- Useful: “the app has been very helpful”
- Ease of use: “It is very easy for the kids to learn AND HAVE FUN!”
- Fun: “my son is enjoying this app”
Common complaints
- Price & subscription: “I want a refund for the app”
- Crashes & bugs: “Autorotate doesn't work my Samsung tablet”
- Login & account: “I was really excited about this app but I can't log in”
- Updates: “the app is also updated and no updates pending”
About Readability Learn How to Read
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
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
Readability Learn How to Read iPhone
Readability Learn How to Read gets 1k+ downloads a day worldwide (AppInsider estimate, October 2026, rounded down to a band).
Not in any tracked top chart right now.
Updated 25 Oct 2026 · rankings refresh through the day
Developere4site Inc.
CategoryEducation
PriceFree
Released
Rating★ 4.6 (749)
Version5.18.2
Age rating4+
First seen by us
25 Sep 2026
25 Sep 2026Installs (est.)1M+ worldwide
Rating
4.6 ★
749 ratings
Measured
Readability Learn How to Read on the App Store
App details
App ID
1477213383
Publisher
Visionaire dba e4Site Inc
Publisher country
United States
On the store since
Oct 2022
4 years on the store
Minimum OS
iOS 16.4+
iPhone 8 and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
296 MB
Readability Learn How to Read downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. iPhone downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Where Readability Learn How to Read's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in Readability Learn How to Read before Apple and Google take their fee.
How this is calculated
Not in an overall Top Grossing chart, only in category charts: each category position is converted to the overall position it corresponds to, then priced on the same rank-to-revenue curve, inside the part of each market the charted apps leave over.
Business model: Subscription-led
How Readability Learn How to Read makes money: subscriptions, one-off purchases and ads.
SubscriptionsIn-app purchases
Subscriptions
/mo
of revenue
Top in-app purchases · App Store US, most popular first
| 1 | Readability Tutor subscription | |
| 2 | Readability Tutor Annual subscription |
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
4.6 ★
749 ratings
Measured
Ratings
749
Measured
About Readability Learn How to Read
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
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
Latest updates
5.18.2
Readability improved reading fluency by 41% in just 6 weeks for elementary school kids. We are continuously refining to provide the best app to improve reading, vocabulary, and comprehension skills.
5.18.1
Readability improved reading fluency by 41% in just 6 weeks for elementary school kids. We are continuously refining to provide the best app to improve reading, vocabulary, and comprehension skills.
5.18.0
Readability improved reading fluency by 41% in just 6 weeks for elementary school kids. We are continuously refining to provide the best app to improve reading, vocabulary, and comprehension skills.
Learn to Read - Readability Android
Learn to Read - Readability gets 1k+ downloads a day worldwide (AppInsider estimate, October 2026, rounded down to a band).
Learn to Read - Readability is #33 in Family Grossing on Google Play in United States and charting in 11 of 23 countries we track.
Updated 25 Oct 2026 · rankings refresh through the day
DeveloperReadability Reading Tutor
CategoryEducation
PriceFree
Released
Installs100k+
Rating★ 4.4 (4k)
Updated
Content ratingEveryone
Rating
4.4 ★
4k ratings
Measured
Best rank now
#33
Family GrossingMeasured
Learn to Read - Readability on Google Play
App details
App ID
com.readability.androidapp
Publisher
E4site, Inc.
Publisher country
United States
Content rating
Everyone
Learn to Read - Readability downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Google Play shows an exact lifetime install count; downloads per day are its daily change (measured). When Play hasn't refreshed the count, they come from new ratings and Top Free chart positions. Confidence is the chance the real number is within half to double ours.
Where Learn to Read - Readability's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in Learn to Read - Readability before Apple and Google take their fee.
How this is calculated
Not in an overall Top Grossing chart, only in category charts: each category position is converted to the overall position it corresponds to, then priced on the same rank-to-revenue curve, inside the part of each market the charted apps leave over.
Business model: Subscription-led
How Learn to Read - Readability makes money: subscriptions, one-off purchases and ads.
SubscriptionsIn-app purchases
Subscriptions
/mo
of revenue
Top in-app purchases · App Store US, most popular first
| 1 | Readability Tutor subscription | |
| 2 | Readability Tutor Annual subscription |
Where it ranks on Google Play
Every top 200 chart it appears in across 23 countries.
| Country | Charts | Rank |
|---|---|---|
| United States | FamilyGrossing | #33 |
| United Kingdom | FamilyGrossing | #23 |
| United States | EducationGrossing | #92 |
| United Kingdom | EducationGrossing | #54 |
| United States | FamilyFree | #129 |
| United States | EducationFree | #173 |
 India | FamilyGrossing | #39 |
 Mexico | FamilyGrossing | #38 |
 Indonesia | FamilyGrossing | #39 |
| United Kingdom | FamilyFree | #126 |
| Saudi Arabia | FamilyGrossing | #40 |
| United Kingdom | EducationFree | #148 |
 Netherlands | FamilyGrossing | #34 |
 United Arab Emirates | FamilyGrossing | #38 |
 Australia | FamilyFree | #119 |
 Vietnam | FamilyGrossing | #32 |
| Australia | EducationFree | #176 |
 Canada | FamilyFree | #189 |
| Saudi Arabia | EducationGrossing | #141 |
| Netherlands | EducationGrossing | #146 |
| United Arab Emirates | EducationGrossing | #147 |
| Vietnam | EducationGrossing | #141 |
Apps near Learn to Read - Readability on the chart
Family Grossing, around #33.
Ratings
Google Play, worldwide.
Rating
4.4 ★
4k ratings
Measured
Ratings
4k
Measured
Written reviews
471
Measured
What users say about Learn to Read - Readability
From the 112 most recent Google Play reviews in the US.
Mixed (44% of recent reviews give 4–5 stars). People like it for good value, and being useful. The main complaints are about price and subscriptions, and crashes and bugs.
What people like
- Price & subscription: “should not charge subscription”
- Useful: “the app has been very helpful”
- Ease of use: “It is very easy for the kids to learn AND HAVE FUN!”
- Fun: “my son is enjoying this app”
Common complaints
- Price & subscription: “I want a refund for the app”
- Crashes & bugs: “Autorotate doesn't work my Samsung tablet”
- Login & account: “I was really excited about this app but I can't log in”
- Updates: “the app is also updated and no updates pending”
About Learn to Read - Readability
⭐ The AI-Powered Readability Tutor: Reading App for Kids K-6
Discover the ultimate reading app for kids in Kindergarten, 1st, 2nd, 3rd, 4th, 5th, and 6th grades. Readability is the top-rated AI-powered reading tutor designed to dramatically improve reading fluency, vocabulary, and comprehension skills.
Our advanced Smart Reading Program uses cutting-edge speech recognition and AI technology to make learning to read enjoyable and highly effective. Perfect for 1st grade reading up through 6th grade reading.
🚀 Key Features of Your Personal Reading Tutor
Guided Oral Reading with Real-Time AI: Watch your child excel! The app encourages your child to read aloud while our advanced AI instantly corrects pronunciation. This makes learning how to read fun and interactive.
Interactive Voice-based Questions & Answers (IVQA™): Boost reading comprehension! IVQA™ offers 1-on-1 comprehension checks where your child responds verbally to questions, fostering critical thinking and deeper understanding.
Personalized Vocabulary Builder: Easily expand your child’s word list. Long-press any word while reading to get the pronunciation and meaning, and add it to a personal list for review.
Tailored Learning for Every Grade: We automatically select suitable reading materials spanning Kindergarten through 6th grade levels, ensuring the content is always challenging but never overwhelming.
📊 Empowering Parent Dashboard
Stay fully informed about your child's reading progress! The dedicated Parent Dashboard allows you to easily track:
Total time spent reading
Accuracy and reading duration
Comprehension scores and progress across all grade levels
Customizable reading schedule
📚 What Sets Readability Apart?
While other reading apps offer games or simple phonics drills, Readability provides a unique, comprehensive learning to read experience with individualized attention:
Real-Time Reading Help: True AI 1-on-1 tutoring that instantly corrects and supports.
Engaging Leveled Books: Vibrant, grade-level stories with captivating illustrations.
Flexibility: Up to 3 Kids per subscription. Learn to Read Anytime, Anywhere.
Start your child's transformational reading journey with a free 30-day trial today! Cancel anytime!
Subscription Details:
Your subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. You’ll be automatically charged at the subscription price for renewal, within 24-hours prior to the end of the current billing period. Manage subscription and/or turn off auto-renewal by visiting Account Settings after purchase.
Support: https://www.readabilitytutor.com/support/
Privacy: https://read.readabilitytutor.com/privacy-policy/
Terms: https://read.readabilitytutor.com/terms-of-use/
Website: https://www.readabilitytutor.com/
Copyright 2023 Readability
Discover the ultimate reading app for kids in Kindergarten, 1st, 2nd, 3rd, 4th, 5th, and 6th grades. Readability is the top-rated AI-powered reading tutor designed to dramatically improve reading fluency, vocabulary, and comprehension skills.
Our advanced Smart Reading Program uses cutting-edge speech recognition and AI technology to make learning to read enjoyable and highly effective. Perfect for 1st grade reading up through 6th grade reading.
🚀 Key Features of Your Personal Reading Tutor
Guided Oral Reading with Real-Time AI: Watch your child excel! The app encourages your child to read aloud while our advanced AI instantly corrects pronunciation. This makes learning how to read fun and interactive.
Interactive Voice-based Questions & Answers (IVQA™): Boost reading comprehension! IVQA™ offers 1-on-1 comprehension checks where your child responds verbally to questions, fostering critical thinking and deeper understanding.
Personalized Vocabulary Builder: Easily expand your child’s word list. Long-press any word while reading to get the pronunciation and meaning, and add it to a personal list for review.
Tailored Learning for Every Grade: We automatically select suitable reading materials spanning Kindergarten through 6th grade levels, ensuring the content is always challenging but never overwhelming.
📊 Empowering Parent Dashboard
Stay fully informed about your child's reading progress! The dedicated Parent Dashboard allows you to easily track:
Total time spent reading
Accuracy and reading duration
Comprehension scores and progress across all grade levels
Customizable reading schedule
📚 What Sets Readability Apart?
While other reading apps offer games or simple phonics drills, Readability provides a unique, comprehensive learning to read experience with individualized attention:
Real-Time Reading Help: True AI 1-on-1 tutoring that instantly corrects and supports.
Engaging Leveled Books: Vibrant, grade-level stories with captivating illustrations.
Flexibility: Up to 3 Kids per subscription. Learn to Read Anytime, Anywhere.
Start your child's transformational reading journey with a free 30-day trial today! Cancel anytime!
Subscription Details:
Your subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. You’ll be automatically charged at the subscription price for renewal, within 24-hours prior to the end of the current billing period. Manage subscription and/or turn off auto-renewal by visiting Account Settings after purchase.
Support: https://www.readabilitytutor.com/support/
Privacy: https://read.readabilitytutor.com/privacy-policy/
Terms: https://read.readabilitytutor.com/terms-of-use/
Website: https://www.readabilitytutor.com/
Copyright 2023 Readability
What's new in 5.18.1
Readability improved reading fluency by 41% in just 6 weeks at a Pennsylvania elementary school. We are continuously refining to provide the best app to improve reading, vocabulary, and comprehension skills.