colophon
plain HTML, CSS, and JavaScript. no build step, no framework, no analytics. inspired by simon willison's tools.
tools shipped
| tool | shipped |
|---|---|
| sprint speed calculator | april 2026 |
| effect size calculator | april 2026 |
build
Every page is a single static HTML file that imports the shared
stylesheet assets/tools.css and shared runtime
assets/tools.js. Everything runs in the browser, on
the device. There is no server, no database, no telemetry.
The design system is documented in DESIGN.md, and the source for every tool is in the repo.