kako-jun's games and apps portfolio
If you build something as an individual developer and want the world to use it, the fastest path is to show it where the world's developers gather: dev.to , Product Hunt , Reddit , and Hacker News (HN). Once you've translated your product into English (i18n), you can reach people everywhere through these places. But you can't just post and hope. Each one has its own etiquette — and…
Machigai Salad is a tool that helps you solve spot-the-difference puzzles — like the famous one on the Saizeriya menu — semi-automatically, just for fun. No sign-up, and it runs entirely in your browser. App: https://machigai-salad.llll-ll.com GitHub: https://github.com/kako-jun/machigai-salad When you overlay two pictures and flip back and forth between them, only…
The “rebuild cost” shown on each app card is an estimate of the cost to rebuild that software from scratch, by hand . It is not the time or money the author actually spent, but the cost of producing the finished result again from the ground up — its replacement value. Background In current software development, the amount of AI-agent usage affects how much and what quality can be produced. Most…
The visit counter at the top of this site (the "visits" bar) and the comment box under each blog post are both powered by Nostalgic . What Nostalgic is Nostalgic is a free service that brings old-school hit counters, likes, rankings and guestbooks (BBS) to static sites that have no backend of their own . kako-jun built it. Each counter or board is identified by a "URL + token" pair, and you add it…
Welcome to Planning Division 42 — the personal site where kako-jun keeps the games and apps he has made (look for the "llll-ll" wordmark). About this site Famicom-era nostalgia meets a dark, cyberpunk mood. The whole thing wears a terminal (btop) look, with small bits of playfulness scattered around — try poking the Tetris up in the header, or flip the theme between light and dark. How to enjoy it…