KatakataWho runs this
One person: Katakata. Planning, building, checking, and updates are all done here. The Japanese site has a longer operator page if you want more context.
What the English tools are
Free browser utilities for everyday design and writing tasks—ratios, fonts, QR codes, diffs, and similar. No account required. Each English tool page includes the working UI and a short explanation.
Privacy and data
How each tool handles input is described on that tool’s page. Pages may load fonts, analytics, or libraries. Never paste credentials, private customer records, or regulated data into a tool you don’t trust.
The full privacy policy and terms are published in Japanese:
Contact
Questions and corrections are welcome via the contact page.
Last reviewed: .