Small tools that do one thing well.

onekind lab is a one-person workshop for web tools. Each one is free, fast, and runs in your browser — most of them never upload what you type.

Time card calculator, timers, time zone converter, wheel spinner and 18 more everyday tools.

JSON and SQL formatters, Base64, JWT decoder and other developer tools — with the manual built in.

Merge, split, compress and convert PDFs right in your browser. Files never leave your device.

Open and edit Word and Excel files on your phone.

Korean saju (four pillars) readings, written and delivered as a personal report.