GGAMISTUDIO is an independent studio in Seoul, run by Jaewook Oh since 2026. About 700 people a month use our apps inside Toss, the Korean finance app with 30 million users. We make games, useful tools, and daily habits for phones and computers. How we build
GGAMISTUDIO is a one-person studio with Grok at the center. Grok Bot is our central orchestrator: it plans the schedule, hands development work to coding agents, runs QA, and keeps every project moving. Our apps don't use Grok inside the product today.
Relationship reading · In development · Runs on the Claude API
Paste a chat from a messenger app, or upload screenshots of it, and Claude reads how the two of you talk: who leads the conversation and where it feels one-sided. You get a relationship temperature and an "only me" score for free. A paid deep reading adds what to avoid saying and a few safe replies you could send next. We don't keep the conversation.
Life simulation game · iPhone · Free · Runs on the Claude API
You are born as one random baby among all the babies born on Earth, and live that life to the end. Your country, family, school, job, marriage, children, spending, and even when and how your life ends follow real statistics from the WHO, the World Bank, and the ILO, with choices along the way. One life takes about an hour. No sign-up.
Real statistics set the odds. Claude decides how each life bends: it weighs the choices you have made and the life you have lived so far, and sets the weights for where your life heads next and which events trigger.
Mock interviews and draft answers · macOS · In development
In practice mode, the app asks interview questions aloud, shows a draft answer as it streams in, and transcribes your spoken answer. At the end it gives overall feedback. The app saves every session. By default, Claude Opus 5.5 writes the drafts and the feedback through the Claude API.
HTML viewer and PDF export · iPhone and iPad · Free
Quick Look shows many HTML files as a blank or broken page. HTMLens opens them much as a desktop browser would: password-protected statements, pages that need JavaScript, web archives, and documents in legacy encodings. Save them as PDF or print.
Live on Apps in Toss · Available inside the Toss app
A daily check-in and gratitude journal inside Toss. Check in once a day, collect small rewards, and write a line about what you're grateful for. Your entries stay on your device.
Live on Apps in Toss · Available inside the Toss app
A small game for resisting impulse spending. Pick a temptation — coffee, delivery, taxis, convenience stores, shopping, or late-night snacks — and hold the shield for five seconds instead of buying. Each save earns coins you can trade for tips, alternative-activity cards, or small Toss point rewards.
Quit-your-job simulator · iPhone · App Store
A quit-your-job simulator made for Japan: leave the company and try living one month at a time as a solo founder, indie developer and more.
Cozy game · iPhone · App Store
A slow, cozy game about getting close to a cat in a small room. Open the door and it pretends to sleep; close it and it gets on with its own day.
Output token speed · macOS menu bar · In review
Shows output token speed (tok/s) from Codex, Claude Code and Grok CLI logs in your Mac menu bar.
Grok is at the center of how we build. Grok Bot orchestrates the work, and we also use Claude Code and OpenAI Codex to write and review code. Claude Design helps us shape screens. These are tools in our development process. The product details below describe how each app uses the Claude API.
Claude sets the weights for each life's direction and for which events trigger. Statistics from the WHO, the World Bank, and the ILO keep every outcome plausible.
Both tools help us implement changes, review code, and check our apps before release.
Claude is a co-author on 81 of Random Life's 94 commits and on all 42 of Interview Cheetah's. We also publish two Claude Code plugins, a status bar and a pomodoro timer, at github.com/wookiist/claude-plugins.
Am I the Only One? and Wallet Shield both began as Claude Design handoffs.
Our saju reading app and a parenting assistant are next. Both will call Claude through one shared backend that holds the key, limits requests per user, and versions prompts per app. Every app tells you up front that an AI wrote the answer.
We're also building Pebbles, a companion dashboard for Tesla drivers on iPhone and iPad, made by a Model Y owner for his own car first. It connects to the car directly over Bluetooth in read-only mode and shows speed, battery, charging and turn-by-turn directions. Pebbles is in development and is an independent project, not affiliated with Tesla.
Questions, feedback, or partnerships: hello@ggami.studio