Benefit
Compare up to six cities in one screen
Drag the selected-time marker and every clock reacts instantly. No more mental math or spreadsheets.
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About us
We turn time zones into common ground.
Common Hour is a precision tool for people who live between time zones. It compares any two to six cities, shows real-time overlaps for working hours and keeps everything in sync — without asking you to sign up, install anything, or read manuals.
FreeNo sign-upIANA accurate6 languages
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Value
Why Common Hour is the best option for the time problem.
Benefit
Find a common window for meetings
Overlapping work hours are highlighted so you can propose a slot that respects everyone's schedule.
Benefit
World view for 54+ cities
Explore a live map of capitals and tech hubs with day/night phase, filtered by continent and searchable.
Benefit
Detailed page per country
Every country has its own page with all of its time zones, DST notes and neighboring countries compared.
III
Mission
Remove the friction from coordinating across time zones.
We believe global work should not depend on a complicated spreadsheet or a broken calendar invite. Common Hour exists to make the simple act of asking "what time is it there?" feel instant, precise and human.
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Vision
A world where distance stops being an excuse.
We want Common Hour to become the default layer teams, families and friends around the world use to stay in sync — regardless of their country, language or device.
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Try it
Compare cities now.
Open the home and add the cities you care about. Everything is already in the URL, so you can share any setup as a link.