A home for the code and experiment results Define404 has built. All code is on GitHub under the MIT license.
01Open source
Download the code and run it right away
Each repository has install instructions and a license file. You can also try them first at their live URLs.
Munche-meo (munche-meo)
A checker that flags, line by line, sentences that break the style rules you set. Load your rule docs as retrieval data (RAG) and call it via an MCP server, the command line, or a Claude Code hook.
MIT
Hangul Type Lint (hangul-type-lint)
A checker that finds mid-word line breaks, forced headline breaks, missing web fonts, and mobile overflow on web pages, and suggests the CSS to fix them.
MIT
Jiwon-meo (jiwon-meo)
Code that pulls support program notices from the Bizinfo public API, filters them by industry, region, and years in business, and emails the matches weekly.
MIT
Gage-meo (gage-meo)
A checker that takes a shop name and scores whether it is listed on Naver and Kakao maps and has a website and contact channel.
MIT
Gyeonjeok-meo (gyeonjeok-meo)
A quote generator that calculates VAT, simplified taxation, and 3.3% withholding, and fills in amounts written in Korean. Includes a quote request page for each business.
MIT
Booking-meo (booking-meo)
Code for an AI chatbot that answers inquiries from KakaoTalk and Naver TalkTalk using only the shop information you registered.
MIT
Meeting-meo (meeting-meo)
Code that shows the gist of what the other person says, what to say next, and term explanations on your Mac and phone during video meetings. Choose Claude, ChatGPT, or Gemini.
MIT
GitHub johndefine404
All public repositories, plus the research report analysis code (define404-research-public).
02Research reports
We measure whether AI answers are actually right
Questions, answer data, and scoring methods are published with each report.
- No. 005When You Ask an AI About a Government Support Program, Does It Get the Deadline Right?
- No. 004When You Ask an AI for the Foreign-Language Name of a Korean Dish, How Often Does It Match the Government Standard?
- No. 003Same Shop, 5 Languages: Does the Shop Information an AI Gives Depend on the Language of the Question?
- No. 002Local404: Does AI Say That Closed Neighbourhood Shops Are Still Open?
- No. 001What Does a Shop's AI Assistant Say When You Ask About Something Not on the Menu
03Typeface
The Define404 typeface release is on hold
When results meet our quality bar, we'll post them here with an open license.