World Time Buddy and Every Time Zone are both free, browser-based tools for lining up time zones visually, and Clocker is a free, open source menu bar app that adds working-hours colour coding at no cost. There.pm takes a different angle, showing named teammates on a lightweight menu bar clock rather than raw time zones, and Zone Bar, from indie developer Sindre Sorhus, adds custom labels and a time-travel slider for $4. Dato and Time, from menubartime.com, both lean toward full scheduling, pairing time zones with calendar and meeting-link integration, for $18 and a one-time purchase respectively. None of them go as far as finding the best overlapping time for a whole group and writing it to everyone's calendar automatically.
| Rank | App | Best For | Price | Key Strength |
|---|---|---|---|---|
| 1 |  Atlas |
Cross-timezone meeting scheduling | $4.99 One-Time | Finds the best overlapping time and books it in local time |
| 2 |  Dato |
Menu bar calendar with world clock | $18 one-time | Combines a menu bar calendar and world clock with event details and meeting links |
| 3 |  Time (menubartime.com) |
Calendar-native scheduling | One-time purchase | Menu bar app pairing time zones with calendar and one-click meeting-link joining |
| 4 |  Zone Bar |
Customisable menu bar clocks | $4.00 | Menu bar world clocks with custom labels, emoji and a time-travel slider |
| 5 |  Clocker |
Free, open source world clock | Free | Menu bar world clock with working-hours colour coding; no group overlap finder or calendar booking |
| 6 |  There.pm |
Named teammates, not raw time zones | Free | Lightweight menu bar clock showing your people's local time by photo, rather than a list of cities |
| 7 |  World Time Buddy |
Web-based time zone comparison | Free | Popular browser tool for lining up time zones and rough meeting planning; no native Mac app |
| 8 |  Every Time Zone |
Simple visual time zone comparison | Free | A clean web-based display of overlapping hours; display only, no scheduling |
1
$4.99 One-Time
Atlas
Where the world finds time.
Atlas treats time zones as a scheduling problem rather than a display problem. Pin your people on the map, and it finds the moment everyone is awake and writes the meeting to each person's calendar in their own local time.
- Pins your people on one living world map
- Finds the best overlapping meeting time
- Books meetings straight into each attendee's local time
- Quick Check keyboard shortcut from anywhere
Frequently asked
What is the best world clock app for Mac?
Atlas, because it goes beyond showing clocks. It pins your people on a map, finds the best overlapping meeting time and books it directly into everyone's calendar in their own local time, a step further than time zone comparison tools like World Time Buddy or Every Time Zone.
Does macOS have a built-in world clock?
Yes, the Clock app lists world clocks for cities you add, but it only displays times. It does not find overlapping availability or write meetings to your calendar.
Can Atlas book a meeting straight into my calendar?
Yes, once you pick a time, Atlas writes it to your calendar in each attendee's correct local time, with daylight saving already handled, and can route to Apple Calendar, Google, Outlook or an .ics file.
What is the difference between Atlas and a tool like World Time Buddy?
World Time Buddy and Every Time Zone are both useful for comparing time zones visually, but neither finds the best overlapping time for a group or writes a meeting to a calendar. Atlas does both automatically.
How does Atlas handle daylight saving time?
Atlas accounts for daylight saving automatically when booking a meeting, so the time on each attendee's calendar is correct for their local clock on that date, not just at the moment you scheduled it.
Is Clocker a good free alternative to Atlas?
Clocker is a solid free, open source menu bar world clock, but it only displays time zones. It does not find overlapping availability across a group or book meetings into your calendar the way Atlas does.