Atlas vs Spacetime: a private Mac app vs a Slack-bound team dashboard

These two tools answer the same frustration, "what time is it for everyone, and when can we all meet?", but they answer it from opposite ends. One is a team surface inside your chat tool. The other is a quiet app on your own Mac. Neither is wrong. They just fit different working lives.

What is Spacetime?

Spacetime is a team dashboard built around a Slack bot. Once it is added to a workspace, it shows each teammate's local time, location and weather, syncs with Google Calendar, and surfaces the working-hours overlap across the group. Everyone on the team sees the same shared picture, which is its real strength: it turns "where is everyone right now?" into a glance for the whole organisation.

Because it is account and team based, Spacetime is priced for teams. That makes sense for its model, you are equipping a group with a shared view inside the place they already talk all day.

What is Atlas?

Atlas is a native macOS menu-bar app. You pin teammates and cities on a world map and see their live local times, with working hours gently shaded so you can read who is awake at a glance. From there, Atlas does two things a dashboard does not: it auto-suggests the best overlapping meeting time, and it lets you add that meeting to your calendar in one tap, in everyone's correct local time, with daylight saving handled for you.

It is keyboard-first. A Quick Check mode appears with a shortcut, so you can answer "what time is it in Singapore right now?" without leaving what you were doing. There are groups for the teams you schedule with most, light and dark themes, and no account: nothing leaves your Mac. You buy it once, the licence key arrives by email, and you paste it into the app.

How do they compare?

The honest split is shared versus private, and showing versus doing. Here are the dimensions that actually matter when you choose.

When should you choose Spacetime?

Choose Spacetime if your team genuinely lives in Slack and you want a single shared surface everyone can see. If the value is "the whole company can glance at the same board of who is online, where, and what the weather is", a dashboard inside Slack is the natural home for that, and the Google Calendar sync fits teams already standardised on Google Workspace. For a Slack-first organisation, it is a tidy fit.

When should you choose Atlas?

Choose Atlas if the scheduling is mostly on you, and you would rather not stand up a team account or tie it to a chat workspace. The wedge is simple: Spacetime is excellent at showing the overlap; Atlas goes a step further and recommends the best moment, then books it in everyone's local time. That is the difference between reading a dashboard and being handed an answer.

It also suits people who care about privacy. There is no account and no cloud sync of who you work with: the people you pin, the groups you build, the meetings you plan, all of it stays on your Mac. For a freelancer juggling clients across continents, or one person inside a larger company who simply does the booking, that combination, recommend plus book plus private plus $9.99 once, is hard to match.

The bottom line

Spacetime and Atlas are not really rivals so much as different shapes for the same problem. If you want a shared team board inside Slack with weather and Google Calendar sync, Spacetime is a strong choice and we would point you to it. If you want a private, keyboard-first Mac app that finds the overlap, recommends the time and books it without an account, that is exactly what Atlas was built to do. For more on reading overlap quickly, see our guide to how many time zones there really are.