Working with people in US, Europe, and Asia means scheduling meetings is a nightmare. How about 3pm your time always takes 3 back-and-forth messages before you find a slot that works for everyone.
ZonePlan.net solves this: pick your timezone, add participants timezones, and it shows you the overlapping working hours with color coding. Green means go, orange means early or late but possible, red means that person is sleeping. Find the perfect meeting slot in seconds.
I built this after spending 45 minutes trying to schedule a call with a developer in Poland and a designer in Brazil. The existing tools either required accounts, were buried in enterprise software, or did not handle more than 2 timezones well.
Built with pure JavaScript timezone math + Next.js static export. No backend, no database, no API calls. Everything runs in the browser.
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