01
Money
Take-home pay, severance, holiday pay, the minimum wage. The rates are dated and the rules carry tests, because a calculator that is quietly wrong is worse than no calculator.
Avenpa · software studio
Tools that answer, then get out of the way.
Avenpa builds small web software for ordinary questions: a take-home figure, a file size, an image that has to be smaller. The first product is live today. The rest is still in the workshop.
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Product
Avenpa Tool
One site, no sign-up wall. Open the page, get the number, close the tab.
tool.avenpa.com02
Time and dates
Date arithmetic, D-day counters, age by Korean reckoning, working days counted around the actual holiday calendar instead of a rough guess.
03
Images
Resize, crop, merge and censor photos in the browser. The file is processed on your device, so there is no upload step and the result appears at once.
04
Everyday numbers
Percentages, ratios, pyeong, unit conversion, QR codes. The arithmetic you would otherwise do twice to be sure.
Research
Notes from the workshop
The parts that were actually hard, written down while we still remember why we chose the way we did.
01
Payroll rules that change every January
Korean labour rates move on their own schedule, so the calculator keeps rates in one dated module and the tests read the constants out of that module rather than copying them.
02
Sessions without a session server
A signed cookie plus one table in SQLite. There is no auth service to be up and no tunnel to fall over, and the failure mode of a session store should not be a 500 on the login page.
03
Image work moved into the browser
Cropping, merging and censoring photos happen on the device that holds the photo. It is faster, it costs nothing to run, and the file never travels.
Company
Small on purpose
Avenpa is a small studio, and it stays small so that the person who made a tool is still around when it breaks. There is no growth deck and no quarterly theme.
01
Finish the small thing
A working calculator beats a platform announcement.
02
Show the arithmetic
When a number matters, the page says where it came from.
03
Keep the door open
No account required to use any of it, and no dark patterns to leave.
Something you would like built?
Tell us what the job actually is. We answer most messages within a few days, and we say no when it is not a fit rather than going quiet.
Get in touch