About

Changes on 2026-09-28

Ordinary wage now checks payment for contractual work instead of fixedness. Salary and tax comparisons no longer present income-band averages as personal rankings or estimated headcounts. PDF merging checks the combined size before reading files and rejects encrypted PDFs.

What this is

just-new makes small tools you can use without signing up or installing anything. Fill in a form and print it, build a display board, see where you stand in the statistics, work out retirement savings, pick somewhere for lunch, and handle the small things that come up while developing.

How it is built

There is no server. What you type is handled inside your browser and never sent to us. It is only static files, which costs almost nothing to run — and that is why it can stay free.

Where a screen uses public statistics or open government data, it names the source and the reference date. Licences are checked first, and material that forbids commercial use is not used at all.

Three languages

The interface and the explanations come in Korean, English and Japanese. Forms and statistics stay in Korean, though — a Korean resignation letter translated into English is no longer a document an office will accept, and figures from Korea's tax service and household finance survey count Korean households, so they mean something different elsewhere.

How we choose what to build

Not by guesswork. We first check whether people actually search for the phrase, and whether those who do are really looking for that tool. Names that seem well known often turn out, once measured, to be searched by people who want something else.

The same goes for building. Whether a puzzle is really beginner level, or whether a board can be solved at all, cannot be seen from the screen, so the rules are kept apart from the screen and run tens of thousands of times. What was checked, and how, is written into each page's FAQ.

If you find a mistake

Sources and reference dates are shown on every page so that you can check them. If what you find differs, tell us — the page and the number are all we need. We check the calculation, source data and explanation together, and correct confirmed errors.

Where it came from

There used to be six separate sites: printable forms, retirement maths, rankings, developer tools, everyday calculators and games each had their own address. They were merged into one so that someone who came for one tool could use the one next to it. Today six groups and 137 tools live together, and every old address still leads to its new place.

How often it is updated

On weekdays we check for the latest closing prices available from the public API. These are not live quotes or a promise of same-day data; use the reference date shown on each page. The holiday table is fetched daily because one-off public holidays appear at short notice; the lunar calendar table is an astronomical fact, fetched once and never changed.

Figures set by law — tax rates, caps, the minimum wage — are not updated automatically. A person confirms the revision and changes them, and each page shows the date it was last checked. Every calculator must pass some 800 tests, each citing the statute or formula behind it, before a deployment goes out — whether a number is right is checked separately from whether it appears.

How it pays for itself

Advertising covers the running costs. Ads sit only where a task has finished, never where they would get in the way — a display board that is playing carries none.