A small learning-app studio
A calm little study room
for kids, a bit every day
RnR Play started as the study room a dad built for his own kids at home. We are polishing it so other families can use it too.
- No ads
- No child data collected
- No internet permission
Uagong In closed testing on Google Play · coming soon
Ages 5–8 · 10–20 minutes a day · Android · Korean & Japanese
A little science, math, a Korean story and a brain puzzle each day. Science experiments are done while chatting in English with the mascot Ttukttak, and kids repeat the English sentences out loud. When the day's study is done, play time opens up.
- Today's study
- One round of fishing
- Game room
The game room has thinking games such as chess, mancala, sudoku and robot path-finding. Parents can adjust how strong the AI play-friend is.
Science — talk with Ttukttak in English and repeat after him 
Math — the level adjusts to the child 
Korean stories — read aloud, then check with a quiz 
Brain puzzles — rule cards walk through each type 
Game room — thinking games like chess, mancala and robot paths 
Stamp calendar — it is fine to miss a day
Screenshots are from the Korean version of the app.
A calendar that forgives
Adventure stamps add up day by day, missing a day is fine, and unfinished days can be picked up later.
Growth report for parents
Parents see how their child is growing in the parent tab. The records are never sent to us.
Listen → speak → read → write
Language practice follows the natural order.
What we promise
The child's screen holds only what the child is learning.
No ads
No advertising on the child's screen.
No child data collected
The child's records stay on your device (and your own Google backup) and are never sent to us. We don't run a server.
No internet permission
The app has no internet permission. Installing it and downloading language packs are done by Google Play.
The mic only checks loudness
When kids repeat sentences, the app only looks at how loud they are. Nothing is recorded.
What's next
R&R In preparation
The English edition of Uagong, for kids in the US and around the world.
AI lab Built at home, used by our kids every day
We build these on our own family devices first, then keep fixing and updating them as we watch our kids use them.
- AI English conversation buddy — a child talks with an AI in English every day, and we keep improving it.
- AI judge debate game — a child states their side, and an AI judge gives a verdict with reasons.
- Star reward board — the family cheers finished study time with stars.
- Family study launcher — games unlock once the day's tasks are done. Uagong grew out of this.
How we build
We are a small studio, so we use our apps ourselves and keep fixing them. We build the apps together with the AI coding tool Claude Code.
Contact
Questions, feedback or requests to delete personal information — please email us. News and updates are on X.