Results you can trust
Draws use unbiased cryptographic randomness. Calculators follow the official Korean laws and notices, and we re-check them every year.
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Web tools · Automation · Custom builds31 free tools live now
Tools+
We build and run free everyday web tools for Korean users — and package the automation behind our sites into a toolkit for bloggers.
H
Built with Claude Code,
tested on our own sites
/South Koreatested on our own sites
✓Who buys coffee today?
✓Fair by design
About
Useful tools
people can trust.
Hangeureut Workshop is a small software company in South Korea. We make the web tools people reach for every day — ladder draws, roulette wheels, salary and severance calculators — and keep them free and fast. The automation we built to run our own sites is packaged as a toolkit for other bloggers, and we take on custom builds for companies and schools.
Open about how it works
We write up how each tool works, including what failed and what we changed.
Less manual work
Anything repetitive gets automated. We use it on our own sites first and only ship what holds up.
Products
What we make
Hangeureut Tools
31 free web tools in Korean: 7 draws and games (ladder, roulette, lots, 3D physics dice, animal race, marble race, a two-player mini-game tournament) and 24 everyday calculators for pay, loans, dates and real estate.
- For
- Anyone who needs a fair draw or a quick, correct calculation
Blog Automation Kit
A single Python CLI that we run every day: keyword demand from Naver's official APIs, audience age skew, title checks, WordPress publishing with Gutenberg blocks, image upload and twice-a-day scheduling.
- For
- WordPress bloggers and people running several sites
Custom builds
Branded prize-draw pages for company events, calculators for academies and offices, and publishing automation set up on your own WordPress site.
- For
- Companies, schools and teams in Korea
How we build
Built with Claude
Claude Code writes most of our code. A few things it has built with us:
- 3D physics dice and races
three.js and cannon-es scenes, plus a headless simulation harness we used to cut the edge-lane win rate in the marble race from 60–86% to 12–32%.
- 24 law-based calculators
Unemployment benefit, severance, brokerage fees and more, with yearly rule tables kept separate from the math so updates are one edit.
- The automation kit
Naver Search Ad and DataLab APIs, WordPress REST publishing and scheduling, in one dependency-free Python file.
- Write-ups
Ten articles (in Korean) on how the tools work — read them here.
Company
Hangeureut Workshop
| Legal name | 한그릇 공작소 (Hangeureut Workshop) |
|---|---|
| Founder | Bonseok Song |
| Founded | October 2026 |
| Location | South Korea |
| What we do | Web tools, software, custom web development |
| Product site | hangeureut.kr |
| hello@hangeureut.kr |
Contact
Say hello
Custom builds, kit beta access, bug reports and partnerships. We reply within two business days, in English or Korean.
For a custom build, tell us
- What you want to make
- When you need it
- Any reference pages or screenshots
- Budget, if you have one in mind