Unix timestamps to dates and back, live in both directions.
Convert numbers between bases with a live bit view.
Convert colours three ways with a live preview.
Strong random passwords from crypto.getRandomValues.
Check any phrase as a palindrome, ignoring case, accents and punctuation, and see the first mismatch.
Pick a shape or drag the points, then copy the exact clip-path polygon CSS.
Draw random whole numbers in any range, with unique and sorted modes and a cryptographic source.
Convert 1-3999 both ways, see how each numeral adds up and catch non-standard forms like IIII.
