PC · Steam · Coming to Steam
Mallowmo
A soft pet that walks on your desktop. Treats, room decor and little diary letters.
Seoul · 2026
RiverMountain
Studio
3 Android apps launching on Google Play, 2 PC titles heading to Steam, 5 client services on Kmong.
Chatterbury · PC · Steam / Coming to SteamApps & games
Work
Android · Google Play · Released · Now in tester release
Petalhug
A routine pet that grows as you finish your tasks — daily to-dos, adventure stories, a room to decorate.
Privacy policy
Android · Google Play · Released · Now in tester release
Grandma’s Phone:
Scam or Not?
Grandma gets scam texts and calls — pick her replies and outwit the scammer.
Privacy policy
Android · Google Play · Released · Now in tester release
Past Self
Grab the bags and escape in 22 seconds. Next round, a copy replays your last run.
Privacy policypastself.rivermountain-studio.com · coming soon
PC · Steam · Coming to Steam
Chatterbury
A streaming tool where your chat becomes a little village along the bottom of the screen.
Developer tools
App Ship Skills
Claude Code · Codex · Google Play
9 skills for Claude Code and Codex that find known Google Play problems in your real .aab before you upload. US$29 one-time (planned). Checkout by Creem (Merchant of Record).
View App Ship SkillsClient work
Services available
Menu design for cafes & restaurantsFrom KRW 29,000View on Kmong
Product detail page designFrom KRW 149,000View on Kmong
Custom Flutter app development (Android/iOS)From KRW 1,650,000View on Kmong
PHP security check, update & 30-day careFrom KRW 55,000View on Kmong
App analysis & competitor reportFrom KRW 190,000View on Kmong
Kmong listing pending
- Small-shop website with booking buttonKmong listing pending
- KakaoTalk channel AI chatbotKmong listing pending
- Excel / Google Sheets automationKmong listing pending
- Toss Payments integrationKmong listing pending
- Order-merging Google Sheets templateKmong listing pending
- Small-shop website templateKmong listing pending
- Build-your-own Kakao AI bot kitKmong listing pending
- E-book: "Hire one AI employee"Kmong listing pending
How projects run
- Consult
- Tell us what you need, your timeline and budget.
- Quote
- We set out the scope and cost.
- Build
- We build to the agreed scope.
- Deliver
- We deliver the work for review.
Coming next
In development
Company
About
RiverMountain Studio is a one-person business in Seoul, Korea. Android apps and games go to Google Play, PC games and a streaming tool to Steam. Developer tools are sold directly (checkout by Creem) and client work is taken through Kmong.
How we work
- We only show real screens.
- We collect only the personal data an app needs.
- We do not inflate numbers or features.
Contact