AcrossTime

Let color do the math

A 24-hour clock where every city is a hand on the same dial. Pick a pivot, drag time, and read where the working days overlap without doing the arithmetic.

The web version shares its palette and city list with the iOS app. Everything stays in your browser: cities, working hours and the skin are stored locally and in the link, nothing is sent to a server. Weather comes from Open-Meteo using city names only.