Weekend Project, Built a Vanilla JavaScript Online Code Editor (2022)
Vanilla JS editor with regex loop prevention, but CodePen already owns this.

Yet another online IDE; Replit, CodePen, and LeetCode Code solve this better.
Students, educators, or casual developers needing quick multi-language code testing without local setup
Replit · CodePen · LeetCode Code
Vanilla JS editor with regex loop prevention, but CodePen already owns this.
Drop-in reader that actually respects Japanese reading conventions: RTL page order, automatic two-page spreads in landscape, and touch-friendly features like pinch zoom with inertia and double-tap zoom. It’s deliberately tiny — ES module, no build step, localStorage resume — and adds practical niceties (insertable ad/pages, preview limits, status-bar cover) that make it useful for anyone shipping comics on the web, even if the idea itself isn’t groundbreaking.
Valheim survival mechanics successfully crammed into an Ultima-style tile engine.
Vanilla JS terminal portfolio tracks what commands recruiters actually type.
Chemical engineer built a refinery simulator to explain their job to kids.
First free in-browser PLC IDE with ladder logic, tests, and trend analysis—no hardware needed.