kkiruk studio · seoul · since 2016
I make apps you'll reach for
every day.
An indie studio of one in Seoul.
From a cat game to a weather app you open every morning —
making apps and games since 2016.
Games
It started with James Spring in 2016 — and grew into Cats are Cute.
Cats are Cute
Cat Town Idle · 10M+ downloads · iOS · Android
A relaxing idle game about collecting cats and growing a cozy town — updated for eight years and counting.
🏆 App Store Featured📖 App Store Story✦ GP Editors' Choice★4.9 · 180K+ reviews
Cats are Cute: Pop Time!
Suika-style cat merge puzzle · iOS · Android
Drop, merge, and pop cats. 11 cats to evolve, 4 modes.
🏅 Indie Games Festival 2021 Top 20🍎 App Store Game of the Day📖 App Store Story📺 Featured in Japanese TV drama★4.8
Palette
Daily Art Puzzle · iOS
A numberless puzzle played with the colors of a daily masterpiece. Merge by color — and on Saturdays, guess the painting from its palette alone.
Quote 2048
Merge tiles into famous quotes · iOS
A version of 2048 where merging tiles reveals new quotes. Shakespeare, Nietzsche, Seneca, Dickinson and 32 more author collections: 60 themes, 1,020 quotes, a crown quote waiting at every 2048.
James Spring
2016 · iOS
A one-tap hide-and-seek runner — bounce past cute-but-dangerous enemies and find all 44 hidden friends. No ads, completely free
James Summer
2016 · iOS
An endless waterslide summer arcade — collect coins to unlock 46 characters and 10 worlds. No ads, completely free
Everything I've shipped — App Store ↗ Google Play ↗
Apps
Apps for checking the weather, saving videos and keeping track of your ideas.
Than Yesterday
Weather, compared to yesterday · iOS
"3° warmer than yesterday" — a weather app that compares today with yesterday, instead of throwing numbers at you.
Pinclip
Bookmark Reels & Shorts · iOS
Saved on Instagram, saved on YouTube — all scattered. Share once from anywhere and keep them in one place, sorted into folders.
Sidefeed
Trend research for creators · iOS
Find ideas outside your own algorithm — trending YouTube videos across 12 countries, on one screen. Research for creators.
Talk Memo
Voice on Watch, text on iPhone · iOS · Apple Watch
That idea you had mid-run — gone by the time you grab your phone. Tap your Watch and just talk; it lands on iPhone as text. Syncs to Notion & Obsidian, pay once.
Honest Camera
My First Camera · iOS
Scared to hand a kid your phone? One shutter, nothing else — no modes, settings or ads to tap by mistake. Photos go straight to your library.
Local Link
Travel Map Search · iOS
For places where Google Maps falls short — search the name you know, and it opens in the map app locals actually use, in the local script.
everykeep
Home Maintenance · iOS
Filters, warranties, cleaning cycles — the upkeep you forget, in one place. everykeep remembers when it's due.
RunNote
Running Journal · AI Coaching · iOS
Not a live-tracking app. Run with your Watch, log one line about how you felt, and Claude's AI coaching tunes to your runs.
CutTogether
Photo Poster · Scrapbook · iOS
Finds the people in your photos, cuts them out on-device, and gathers them onto one scrapbook poster. Nothing leaves your phone.
DeskBreath
Breathing Reminder · iOS · macOS
DeskBreath keeps a quiet breathing circle alive in your iPhone's Dynamic Island or your Mac's menu bar — 4 seconds in, 6 seconds out — even with the app closed, plus stretch reminders.
CapBox
Screenshot Cleaner · iOS
Swipe through piled-up screenshots and file them into folders, then find them later by the text inside. All on device.
SwitchBoard
Claude Code monitor · macOS
Running several Claude Code sessions? See which one is waiting for your input, right from the menu bar — plus Slack, Discord and Telegram alerts.
Rail
A log that fills the map with the lines you've ridden — one for Japan, one for Korea, one for New York, one for Taiwan.
Tetsulog
Japan Rail Trip Log · iOS
A Japan rail trip log covering 163 operators, 571 lines, 10,096 stations.
Raillog
Korea Rail Trip Log · iOS
A Korean rail trip log covering 16 operators, 75 lines, 1,622 stations.
NYC Subway Log
New York Subway Log · iOS
A New York City subway log covering 25 services and 475 stations.
Taiwan Rail Log
鐵道誌 · Train, MRT & HSR Stamp Book · iOS
A Taiwan rail log covering 39 lines and 589 stations — TRA, High Speed Rail, the MRT and the Alishan Forest Railway.
Stickers
kkiruk in your chats — cats and office workers you can paste.
限界ねこ (Genkai Neko)
Genkai Neko · LINE Stickers · LINE
At my limit again — but still cute. Self-deprecating “aru-aru” stickers for office workers and developers, made for Japan.
極限貓 (Jixian Mao)
Jixian Mao · LINE Stickers (Traditional Chinese) · LINE
So tired today — but still cute. Self-deprecating stickers for Taiwan: office life, studying, and stan culture.
Mr. Finger Goes to Work
LINE stickers · 5 languages
Office-life stickers starring a finger character heading to work. Released in 5 languages.
Happy Purrsday!
LINE stickers · animated cats
The cats from Cats are Cute, animated right in your chats.
Goods
kkiruk on your desk — characters you can actually hold.
Artwork
Not apps, not games — things I simply wanted to make.
Hi, I'm kkiruk 👋
Thoughts on an app, new ideas, or something we could build together — drop me a line anytime.