Colour contrast checker
Check two colours against the WCAG 2 contrast ratio thresholds (AA and AAA, normal and large text, UI components), with a live preview. Runs in your browser.
Browser tools
Small, single-purpose tools that run entirely in your browser. Nothing you paste or type leaves the page; there is no server behind them.
Fluid type clamp() calculator
Generate a CSS clamp() expression that scales a font size (or any length) smoothly between two viewport widths, and check it against the WCAG text-resize rule.
JSON formatter and validator
Pretty-print, minify, sort and validate JSON in your browser, with the line and column of the first syntax error. Nothing is uploaded.
Regular expression tester
Test a JavaScript regular expression against sample text in your browser: live match highlighting, capture groups, flags and a replacement preview.