Hi, my name is Yukai, which means "happiness" in Japanese (although it's a Chinese name).

I'm a developer who loves building projects focused on productivity or simply for fun.

The following list contains the projects I've built in recent years, and I update it occasionally.

Some earlier projects can be found on my GitHub. I publicly track work-in-progress projects and ideas on my GitHub Project Board. I also create userscripts for browsers from time to time, which I share on Gist.

• ditl - Mar 2026
  • Short for "designer in the loop" — a deterministic pipeline for turning AI-generated product icon rasters into crisp, reusable SVGs.
  • Uses VTracer/Potrace for vectorization with AI only proposing parameter changes between deterministic runs, not authoring final geometry.
• inko - Feb 2026
  • Inkō is a vocabulary learning app built around active recall across multiple channels: writing, typing, and listening.
  • Supports importing Anki decks with field mapping, browsing shared community decks, and submitting curated decks to a moderated public library.
• ykmx - Feb 2026
  • Yukai's take on a terminal multiplexer, written in Zig. With libghostty embedded.
• giallo.kak - Jan 2026
  • Giallo (a Rust-based textmate syntax highlighter) plugin for the Kakoune editor.
• kakoune-script-textmate-grammar - Jan 2026
  • TextMate grammar for Kakoune script files with embedded language support (useful for editor syntax highlighting).
• timers - Jan 2026
  • A vibe-coded timer web app.

• ibox-easymap - Dec 2025
  • 一個足夠好用的 i 郵箱地圖 — a map tool for finding i-Post pickup boxes in Taiwan.
• ykhn - Dec 2025
  • Vibe coded yet another Hacker News client, built with Vue. Give you enough retro vibes
• tmuxship - Nov 2025
  • Tmux and Starship prompt integration, written in Rust.
• raycast-context-bridge - Nov 2025
  • Build and run the Raycast companion browser extension for Firefox.
• mygo-avemujica-search-raycast - Nov 2025
  • 買夠母雞卡台詞搜尋 / 梗圖搜尋器 — a Raycast extension for searching MyGO!! and Ave Mujica dialogue and memes.
• raycast-manual-quizer - Nov 2025
  • Raycast 小學堂 — a vibe-coded Raycast quiz app created for a meetup giveaway.
• garbage - Oct 2025
  • Just vibe coded another garbage truck tracking app for the web.
• deprecalc - Sep 2025
  • DepreCalc 手機折舊成本計算器 — a phone depreciation cost calculator.
• n8n-intelligence - Apr 2025
  • An AI-powered n8n workflow generator.
• vibers-goal - Apr 2025
  • Yet another todo app for the vibe coders. Viva la vibing.
• festva - Mar 2025
  • 音樂祭時程表，大港我來了！— A music festival schedule tool.
• gakuon - Jan 2025
  • An AI-powered audio and content generation service for your existing Anki deck.
  • It use additional fields that wouldn't break your existing deck.
  • Also comes with a PWA app for listening through the audios on mobile
• wrap-calculator.kak - Jan 2025
  • A plugin for the Kakoune editor that enables soft-wrap navigation.
  • I was really missing the gK/gJ functionality in Vim.
• amdex - Jan 2025
  • AMDex, short for "AMD extraction", restores AMD-style JavaScript that has been bundled into modules.
• bookmarks.kak - Jan 2025
  • A bookmark plugin for the Kakoune editor that lets you map keys to saved positions (line, cursor, and comments) for quick navigation.
  • I really missed the marking features in Vim.

• tsm - Yet another Tmux session manager - Nov 2024
  • The main difference of tsm compared to similar tools is that it creates tmux sessions with a popup and links them with a parent session (essentially based on matching session names).
  • I just haven't had enough time to create a proper README for it. 😂
• Film Scheduler - Oct 2024
  • A movie scheduling tool designed for organizing screenings (currently supporting the Golden Horse Festival in Taiwan).
• barbarcode - Aug 2024
  • A Progressive Web App (PWA) based mobile barcode scanner accompanied by a CLI tool to emulate key sequences.
• LiftLedger - July 2024
  • A Tree-sitter grammar for an experimental text-based fitness tracking tool.
• hx-utils - Jun 2024
  • A Helix editor helper that integrates a file explorer and other fzf tools, working on both tmux and WezTerm.
• daily-oops-gemini - Jun 2024
  • My blog, mirrored in the Gemini protocol as well as a text-based HTML version.
• chami-match - May 2024
  • A HSV color recognition game that helps you develop an "absolute color" perception.
• ssh-config.kak - April 2024
  • Syntax highlighting for SSH config files in the Kakoune editor.
• gitlinker.cr - April 2024
  • A platform-agnostic CLI tool that generates permalink URLs for GitHub, GitLab, and other version control systems.
• tailportal - April 2024
  • A CLI tool to quickly create Tailscale exit nodes on multiple VPSs using the Pulumi SDK, aka your on-demand VPN.

• vimify-hackernews - Aug 2023
  • A browser extension that lets you navigate Hacker News with Vim-inspired keybindings.
• coscup-session-openai - Aug 2023
  • COSCUP session RAG (mostly inspired by the Supabase tutorial).
• cpami-captcha-recognizer - May 2023
  • A TypeScript project running on the Deno runtime that tests AI capabilities for implementing a basic OCR.
  • It also provides a GreaseMonkey userscript that can pre-fill captchas for you.
• wezl.fish - April 2023
  • A WezTerm command-line utility that can easily create customized or predefined terminal layouts using minimalist syntax.
  • Mostly co-authored with GPT-4, it’s an experimental project created entirely with AI.
• chatgpt-tui - Mar 2023
  • A TUI ChatGPT app written in Go using the Bubble Tea TUI library.
• Tab Scroll synchronizer - Mar 2023
  • A Chrome extension that synchronizes scrolling progress across tabs, useful when using Google Translate or other side-by-side translation tools.
• zuzugo - Feb 2023
  • A self-hosted notification system for rental houses that supports sending notifications via Line messages or Slack channels.
  • It uses Inngest to manage queues and background jobs.
• Blast Launcher - Jan 2023
  • A project inspired by the Raycast launcher. It leverages a custom Node.js React runtime capable of consuming Raycast extensions through a compatible API, with the goal of building a universal cross-platform launcher that can run existing Raycast extensions.

• Curator.bio Raycast Extension - Nov 2022
• Shortcut Raycast Extension - July 2022
• Bitfinex Margin Funding Raycast Extension - July 2022
• HackMD Raycast Extension - July 2022
• OBS Control Raycast Extension - June 2022
• quiver-markdown-exporter - May 2022
  • A Markdown exporter for the Quiver note app that produces Obsidian-compatible markdown.
• messenger-JSON-viewer - April 2022
  • An offline-first PWA for browsing exported Facebook Messenger JSON messages.
• Eagle Raycast Extension - April 2022
• Heroku Raycast Extension - April 2022
• Debank Raycast Extension - Jan 2022

• A Tampermonkey script to make YouTube dislike count back - Nov 2021
  • A simple TamperMonkey script that recovers the video dislike count from the YouTube API. However, I soon realized that YouTube would completely remove the dislike feature—including the API—so it was deprecated.
• obsidian-primer - July 2021
  • A GitHub Primer-inspired theme for Obsidian.
• github-highlightjs-themes - April 2021
  • A GitHub Primer theme for highlight.js. While developing my personal blog with Next.js, I chose highlight.js for code block syntax highlighting. I wanted every detail to align with the Primer Design system, so I created this theme specifically for highlight.js.

• mojidict-helper - March 2020
  • A browser extension for quickly looking up Japanese-to-Chinese translations. Originally written in vanilla JS in 2020, it was rewritten in ReactJS in September 2021.

• vscode-ptt - March 2019
  • A VS Code extension that integrates Taiwan's largest BBS forum into the sidebar.

• CircleCI Raycast Extension - Mar 2023
  • Fixed a small unexpected error bug
• Kaomoji Raycast Extension - Jan 2023
  • Made it to support grid layout, just like what Raycast builtin emoji picker looks like.
• RSSHub 591 Rule - Jan 2023

• payouri/heroku-client - March 2022
  • An Heroku API Client written in TypeScript. I was developing my owned Raycast extension that depends on this library.

• tonybaloney/vscode-pets - April 2021
  • A fun project that adds a pet WebView for VS Code. I opened a pull request for making the WebView available in sidebar explorer.

• Disfactory - Starting from Oct 2019
  • An illegal factory reporting system. The backend server is built with Django, and the frontend is built with Vue.js.