Add the cities your friends live in (about 120 major cities, searchable in eight languages, works offline). Each person becomes a metro line across your day; drag the time along the lines and see everyone’s local time. The hours when everyone is awake (8:00–23:00 by default, adjustable) are highlighted and listed. Daylight saving is handled with your browser’s built-in time zone data, including half-hour and 45-minute offsets, and you get a heads-up when someone’s clocks change soon. Copy a ready-to-send summary in your language. Cover art is AI-generated; the page itself is hand-built and uses no AI.