Atlas vs World Clock Pro & Sundial: which Mac time-zone app actually schedules?

These three apps look similar at a glance: each helps you keep track of time across the world on a Mac. But they answer different questions. Pick the wrong one and you'll spend longer doing the very arithmetic you bought an app to avoid.

What does each app actually do?

World Clock Pro, available through the Setapp subscription, gives you a map visualisation, a list of favourite cities and a meeting-time picker so you can read across zones. It's a polished way to glance at the world. Some users have reported the odd daylight-saving accuracy quirk, so it's worth sanity-checking edge dates around clock changes.

Sundial is a smaller, simpler Mac time-zone utility. It does the core job, showing you times in a few places, without much ceremony. If you want something lightweight and unfussy, that's a genuine strength.

Atlas is a native macOS menu-bar app that pins teammates and cities on a world map with live local times, shades each person's working hours, and then does the part the others leave to you: it auto-suggests the best overlapping meeting time and, in one tap, adds the meeting to your calendar in everyone's correct local time, with daylight saving handled for you.

How do they compare side by side?

Which one is right for you?

If your day is mostly about awareness, knowing whether it's a sensible hour to message a colleague in another country, then a display tool is plenty. World Clock Pro is a good fit if you already pay for Setapp and like a map-first view; Sundial suits anyone who wants the lightest possible glanceable utility.

If your day involves setting up calls across zones, the workflow changes. Reading the times is only step one; you still have to find the slot that respects everyone's working hours and then create a calendar event that lands correctly for each attendee. That last mile is where Atlas is designed to win.

Where Atlas is genuinely different

All three apps can tell you it's 3:00 PM in London and 7:00 AM in San Francisco. The difference is what happens next:

• It recommends, not just shows. Atlas reads each person's shaded working hours and suggests the best moment that works for the whole group, so you're not eyeballing overlap by hand.
• It books natively. One tap writes the meeting to your calendar in everyone's correct local time, with daylight saving accounted for at the moment of booking.
• It's fast to summon. A keyboard shortcut opens Quick Check mode for a fast read without breaking your flow, and the whole app is keyboard-first.
• It's private and simple to own. No account, nothing leaves your Mac, and it's a single $9.99 purchase rather than a subscription.

How do you get Atlas?

Atlas is a one-time purchase. You buy it once through the checkout, the licence key arrives by email, and you paste it into the app. There's no trial of patience with monthly billing and no sign-up wall. If you'd like to see the full feature list and screenshots first, the Atlas overview covers groups and teams, light and dark themes, and the booking flow in detail. You can also browse more comparisons and guides on the Atlas blog.

None of this makes World Clock Pro or Sundial bad choices. They're good at what they set out to do. It comes down to a single honest question: do you just need to see the time everywhere, or do you need to schedule and book across it?