SyncZones is a free timezone overlap calculator built to help remote teams find fair meeting times across time zones.
James Crawford built SyncZones to solve a recurring problem in distributed teams: finding meeting times that work fairly for everyone, not just one timezone.
He created a browser-based tool that does the math instantly and makes it easy to share with the whole team.
Most timezone tools focus on conversion — "What time is it in Tokyo when it's 3 PM in New York?" But the real question remote teams need answered is: When can we all meet?
SyncZones visualizes business hours across up to 5 time zones side by side, highlights the overlap window, and gives you a shareable link so everyone sees the same view. No signup required, no subscriptions.
SyncZones is built with native JavaScript and runs entirely in your browser. Your timezone setup is encoded in the URL — nothing is sent to a server. The tool is free to use, open to everyone, and supported by optional advertising from companies that serve remote teams.
The SyncZones blog publishes practical guides on scheduling across specific timezone corridors — like US–India, London–New York, and New York–Lagos — along with deep dives on Daylight Saving Time quirks, async strategies, and how to use tools like Outlook and Teams with distributed teams.
If there's a corridor or topic you'd like to see covered, let us know.