Independent Developer
Practical insights on building products with AI, indie hacking, and software craftsmanship.
KeepOnFirst Journal
A working journal about AI-assisted development, indie products, and tools for focused work: what I built, why I built it, and what I decided to remove.
Built from practice and sources.
Technical notes document products, code, and development decisions. Research and everyday topics identify their sources and testing limits. Browse the topics below to find what you need.
The day I finished my typing test I ran it once myself. Speed, accuracy, passage changes — all fine. The next morning I switched back to Zhuyin and the screen turned red. I pressed ㄐ and the app immediately decided ㄐ was not 今. I had missed it the day before because I had tested in English.
Curated Topic Shelves
First-hand technical and product field notes across four core engineering domains.
KOF Guides · Knowledge Base
Understand AI agents, WebGL, Three.js, and indie development terminology with working code examples.
Want to browse everything? Start with the article index.
Browse all 40+ journal articlesInteractive Labs
Daily Challenge #—
Everyone types the same passages today. 60 seconds, characters per minute, then the leaderboard.
Take the challenge3D Racing
Race a lap through a 3D night-time Xinyi district — right in the browser, nothing to install.
Start drivingInteractive Essay
An essay you can walk into — an immersive scroll-driven 3D storytelling experiment.
Step insideWhat I'm currently building or exploring.
An AI second-brain note app. Share posts, articles, and YouTube talks in; AI turns them into searchable, chattable cards — and weeks later they actually come back.
A vocabulary learning iOS app designed to live on your Home Screen. Learn new words effortlessly every time you unlock your phone—no app to open, no notifications. Just calm, passive, effective learning built into your day.
A clean and easy-to-use Pomodoro focus timer. Even if you're new to the Pomodoro technique, you can get started right away and stay focused while working or studying.
A baby activity tracker built for tired hands and busy days. Quick Add, voice input, and family sync—log in 3 seconds. Warm, gentle design that won't hurt your eyes at 3 AM.
Classic arcade game for quick breaks. Practice your focus and reaction time. No gambling, no ads, just pure fun.
Timeless falling blocks puzzle. Test your spatial thinking and strategy. No gambling, no ads, just pure puzzle challenge.
Test your reaction speed in milliseconds. Simple, accurate, and fun. Track your best time and improvement.
Whether you have feedback on my apps, want to collaborate on an idea, or just want to say hi, I'd love to hear from you.