AppBrain
AppBrain
  • Apps
  • Apps being viewed right now Trending apps today Most popular apps All-time most installed apps Top rated apps iPhone and iPad apps
  • Intelligence ▾
    Intelligence overview → Track any Android app or your whole market
    Track & analyze
    Keyword Tracker & OptimizerTrack & improve Play rankings App Performance ReportOne-off PDF for any app StatisticsFree Android & Play market stats
    Promote your app
    Featured Apps App Links
  • Intelligence
  • Pricing
  • Dashboard
  • Sign up
  • Log in
App Store Apps > Education > R21
R21 icon

R21

by CAVES BOOKS LTD. · Education · Free
On the App Store since February 2017 · Data updated 2026-10-30

R21 is made and published by CAVES BOOKS LTD. AppBrain is an independent app data site and isn't affiliated with CAVES BOOKS LTD. The app name, icon, screenshots and description belong to CAVES BOOKS LTD. and are shown as published on the App Store.

AppBrain's verdict

Last updated
December 5, 2023
Size
114.2 MB
Official page on the App Store

User feedback

Ratings and reviews on the App Store

Comments on R21 for iOS

We don't have enough comments to show example comments. Please check back later.

Store listing

By CAVES BOOKS LTD., from the App Store
R21 Screenshot 1 of 3
R21 Screenshot 2 of 3
R21 Screenshot 3 of 3
Screenshots by CAVES BOOKS LTD., from the the App Store listing
Description by CAVES BOOKS LTD. Written by the developer, not by AppBrain. Click to read.
R21 is a new six-level reading series carefully designed to help young learners develop the skills they’ll need to succeed in the 21st century. Each book covers a range of topics and makes use of the latest Content and Language Integrated Learning (CLIL) methods to ensure they’ll appeal to young children and have a connection to children’s wider studies and experiences.
With R21, reading is fun, inspiring as well as informative, and children will not only develop their reading competence but also become a great thinker in the 21st century.
Official page on the App Store Also on Google Play

Safety and technology

Found in the app by AppBrain
Price
Free
App size
114.2 MB
Content rating
Everyone

Technologies used by R21

Releases

Updates seen on the App Store
Version
1.24
Launched
February 2017

No changelog data

Alternatives

Similar apps and more from CAVES BOOKS LTD.

Alternatives to R21

EZ Test - TOEIC® Writing icon EZ Test - TOEIC® Writing
Nhat Xuan
0.0
Free
MyET My English Tutor icon MyET My English Tutor
L Labs Inc.
4.2
Free
26 ratings
English Talk, Chat with AI Bot icon English Talk, Chat with AI Bot
OpenRhapsody
5.0
Free
5 ratings
Spotlight eMagazine icon Spotlight eMagazine
ZEIT SPRACHEN GmbH
4.2
Free
5 ratings
MyCT My Chinese Tutor icon MyCT My Chinese Tutor
L Labs Inc.
4.3
Free
75 ratings
Relay Reader icon Relay Reader
Educational Testing Service
4.3
Free
9 ratings

More from CAVES BOOKS LTD.

P21 icon P21
CAVES BOOKS LTD.
5.0
Free
1 ratings
Caves Media Player icon Caves Media Player
CAVES BOOKS LTD.
0.0
Free

Also available on Google Play

R21 icon R21
敦煌書局
0.0
Free
5,000+

Rankings

App Store top charts

App Store Rankings for R21

This app is not ranked

About the app and developer

About R21

R21 is an education app developed by CAVES BOOKS LTD.

User Ratings

The app has no ratings yet.

App Information

R21 is freely available from the App Store. The app size is 114.17 MB. The latest version available is 1.24. The last update was on December 5, 2023.

Technical Requirements

The app has a content rating of Everyone. The app has been available on the App Store since February 2017.

Developer information for CAVES BOOKS LTD.

CAVES BOOKS LTD.

Address:

Frequently asked questions about R21

Is R21 free?

Yes. R21 is free on the App Store.

Is R21 still available?

Yes. R21 is on the App Store, and the last update we saw was on December 5, 2023.

How large is R21?

R21 is 114.17 MB.

Is R21 suitable for children?

App Store rates the content of R21 as suitable for everyone.

Who made R21?

R21 was developed by CAVES BOOKS LTD. It is listed in the education category on the App Store.

What are the best alternatives to R21?

People looking at R21 also look at these education apps: EZ Test - TOEIC® Writing, MyET My English Tutor, English Talk, Chat with AI Bot, Spotlight eMagazine, MyCT My Chinese Tutor.

Share R21

Today's trending apps Popular Education Apps Price drops on Google Play Apps other people are watching Top new apps
EZ Test - TOEIC® Writing icon EZ Test - TOEIC® Writing
MyET My English Tutor icon MyET My English Tutor
English Talk, Chat with AI Bot icon English Talk, Chat with AI Bot
Spotlight eMagazine icon Spotlight eMagazine
MyCT My Chinese Tutor icon MyCT My Chinese Tutor
Relay Reader icon Relay Reader
Overview Alternatives Reviews Rankings Technology
AppBrain Intelligence premium content

Subscribe now to get full and unlimited access to AppBrain Intelligence. You'll have access to:

  • App Intelligence dashboard (performance timeline, competitor comparison, country rankings, insight cards)
  • Detailed ranking data per app
  • Full timeline per developer
  • Device market shares data per country
  • Unlimited keyword tracking
1 Month

$75/mo
(billed every month)

SAVE 0%
Subscribe
3 Months

$65/mo
($195 billed every 3 months)

SAVE 13%
Subscribe
1 Year

$57.50/mo
($690 billed every year)

SAVE 23%
Subscribe
Each subscription will automatically renew 3 days before the expiration date for the same time period. Subscriptions can be cancelled at any time before the renewal.

AppBrain is an app data site, we track rankings, ratings, installs for all apps and games on Google Play and the App Store. AppBrain doesn't host app files or APKs, all install links go directly to the official store. All trademarks are owned by their respective owners.

More apps

  • Top Android apps being viewed
  • Nice Night Clock & Alarm Timer
  • Caribe Express Money Transfer
  • Live Fun - Video Chat online

App statistics

  • Android statistics
  • Google Play Developer stats
  • Trending Android Apps
  • Trending iOS apps
  • Top popular Apps
  • Buy the best Android phone
  • Buy & sell app businesses

About AppBrain

  • Contact
  • Privacy
  • Documentation
  • DMCA takedowns
  • Blog
  • The AppBrain advertising system
© 2010-2026 - AppBrain