Projects

Things I've built, on and off the web.

6 projects · 2023–2026

• yCAPTCHA (opens in new tab)
  yCAPTCHAActive2026

  CAPTCHA widget for small communities and subcultures — site owners build challenges around shared in-jokes (subway lines, rhythm game charts, niche memes) instead of boring traffic lights.

  Next.js · Drizzle · Redis
• maiSQL (opens in new tab)
  maiSQLActive2026

  SQL practice skinned as the maimai rhythm game — solve exercises against a 200k-row SQLite database in the browser, scored PERFECT / GREAT / GOOD / MISS.

  React · sql.js · Cloudflare Workers
• vocaloid-type (opens in new tab)
  vocaloid-typeActive2025

  Typing rhythm trainer for VOCALOID and UTAU tracks, with maimai-inspired grading.

  Next.js
• RAG-template (opens in new tab)
  RAG-templateArchived2024

  Enterprise RAG starter — document ingestion, embeddings, and chat over an organization's knowledge base.

  Next.js · LangChain
• bdfz.app (opens in new tab)
  bdfz.appArchived2023

  北大附中 AI 助手 — RAG over school documents with OpenAI embeddings, serving students and teachers.

  Next.js · Supabase · OpenAI
• AInnotator (opens in new tab)
  AInnotatorArchived2023

  Annotate PDFs with AI.

  Next.js