I make small tools for oddly specific problems.

Open, MIT-licensed 2D puppet engine for the web, a Live2D alternative whose Claude Code plugin has an image model draw a character's parts and then rigs them over MCP.

TypeScript framework for Live2D AI characters that talk, react, and look at you, with swappable OpenAI and Gemini backends for chat and voice.

Claude Code plugin where Claude plans and writes the code and Codex reviews it read-only, looping until Codex has nothing blocking left.

A SimCity-style city builder for the browser, where workers are matched to jobs over the road network and their commutes become traffic.

Electron desktop app that gives your local OpenClaw agent a Live2D face and a voice, with installers for macOS, Windows, and Linux.

AI character platform: build characters and worlds, chat one-on-one or in groups, and play branching stories, in English and Korean.

Claude Code and Codex plugin where an agent translates a game's text and a deterministic CLI extracts, validates and rebuilds the game files.

Local harmony analyzer that finds a recording's chords on the beat, inversions included, and labels them with Roman numerals that flag secondary dominants and borrowed chords.

Text-first travel game in the browser: cross a seeded map of a region you don't know, read the signs on the road, and keep nothing between journeys but what you've learned.

Tracker for the CPU ratings in Yu-Gi-Oh! World Championship 2008 (DS), with a headless emulator harness that played 1,600 tournaments and pinned down the game's rating formula.

Studio where Claude Code agents make Korean math and science Shorts, from topic to upload file, with code-rendered Remotion animation and a human approving at checkpoints.

Fix the mismatches between your YouTube Music liked songs and YouTube likes — swapped, duplicated, missing and dead songs. A local CLI that fixes only what it can prove.

Chrome extension that adds a social layer to any page with ratings, comments, and community voting.

A numeral system where n is the Pokémon with National Pokédex number n, shown on a live clock and a converter, with a silhouette hardcore mode.

A LeetCode study log kept as GitHub Discussions and published with Repozine, plus a Claude Code plugin that gives one hint level at a time instead of handing over the answer.

Template that turns a GitHub repository's Issues or Discussions into a static Astro blog, rebuilt and deployed to GitHub Pages by GitHub Actions.

A Next.js + Firebase starter where the server does the Firebase work: session cookies verified by the Admin SDK, and per-user Firestore data.

Browser-only viewer for KakaoTalk export files with search, date navigation, and multi-platform parser support.

Browser subtitle editor that times SRT/VTT captions on a draggable timeline against a local video or a YouTube link.

Seven browser machines for famous number facts, from Kaprekar's constant to aliquot sequences, each doing its arithmetic live as you watch, with no libraries.

Dynamic Open Graph image generator that creates share-ready preview cards from any URL.

Korean backend interview guide organized across database, cloud, system design, and programming, drafted and reviewed with Codex, Claude Code, and an agent harness.

MCP server that exposes Korean APIs (Naver, Kakao, TMAP) as tools for LLM applications and agent workflows.

Random name picker that keeps one list of names for a spinning wheel, real-physics 3D dice and a ladder game, in English and Korean.

GitHub Actions template that auto-generates daily contributions by creating scheduled empty commits.