Best apps like R21

10+ similar apps compared and reviewed

4.1 avg rating
8 free apps
Updated October 2026
R21
R21
CAVES BOOKS LTD.

Looking for something like R21? We've analyzed 10+ similar apps to help you find the best alternative. Each app is compared by ratings, features, and real user reviews, so you can make the right choice.

Top Alternatives to R21

Math Cats#1

Math Cats by Knowledge Vortex, LLC

Grade 1-6 Math Practice
Editor's Choice
📚 Education
5.0(3 ratings)
$5.99
Math Cats screenshot 1
Math Cats screenshot 2
Math Cats screenshot 3
Math Cats screenshot 4
Math Cats screenshot 5
Math Cats screenshot 6

This app offers interactive math practice for grades 1-6, rewarding children with collectible cat images and videos as they master arithmetic skills. It provides detailed progress tracking for parents and a virtual scratchpad for calculations, eliminating the need for paper.

Math Orbs#2

Math Orbs by Knowledge Vortex, LLC

Grade 1–6 Algebra Practice
Strong Contender
📚 Education
5.0(2 ratings)
$0.99
Math Orbs screenshot 1
Math Orbs screenshot 2
Math Orbs screenshot 3
Math Orbs screenshot 4
Math Orbs screenshot 5
Math Orbs screenshot 6

This app offers Grade 1-6 algebra practice for children, allowing parents to track progress and identify areas of difficulty. It features interactive quests, collectible orbs, and a virtual scratchpad for calculations, making learning engaging and eliminating the need for workbooks.

PaGamO#3

PaGamO by BoniO

Worth Considering
📚 Education
3.6(20 ratings)
Free
PaGamO screenshot 1
PaGamO screenshot 2
PaGamO screenshot 3
PaGamO screenshot 4
PaGamO screenshot 5
PaGamO screenshot 6

This educational gaming platform uses a multiplayer online game to make learning engaging. Players conquer lands by answering questions across various subjects, fostering self-directed learning and motivation. It offers free educational materials and diverse content for K12 students.