Devine, Robinson, Miller and Hamwi side by side, plus the healthy BMI band.
Reduce a ratio with GCD, scale it, split a whole, and convert seven unit pairs.
Percent change, the reverse, percent-of, and compound growth over N periods.
A scale ladder from 1 m to the observable universe: how many of a reference object fit.
Paste a sample document and get a draft-07 JSON Schema inferred from it, with required lists, array items and nested objects, downloadable as a file.
Run a JSONPath expression over a document and see every match with the path it was found at, supporting wildcards, indexes, slices and recursive descent.
Translate text to Morse and back, then play the symbols as real tones through Web Audio.
Click any swatch to copy its hex, with tints mixed toward white and shades toward black in sRGB.
