Clocker is a free, open-source Mac menu bar app that puts every time zone you care about one click away, paired with a compact calendar overlay for instant scheduling context.
What is Clocker?
Clocker is a lightweight macOS utility that lives permanently in your menu bar, letting you track local times across multiple cities and time zones without ever opening a browser tab or doing mental arithmetic. It was built by Abhishek Banthia as a personal itch-scratcher for remote workers — and it shows in the focus. There is no bloat, no subscription, no account. Just clocks.
Click the menu bar icon and you get a tidy popover listing every location you've added alongside its current time and day offset. A built-in calendar view sits just below, so you can glance at whether your 3 p.m. Tuesday call lands on Monday evening in London without switching apps.
What does Clocker do best?
Clocker's strongest suit is frictionless time-zone awareness — the information surfaces in under a second with a single click, formatted exactly how power users want it.
The time display is highly configurable: 12- or 24-hour format, relative offsets (+5, −8), day labels, and the ability to reorder locations by drag-and-drop. The integrated calendar is genuinely useful rather than decorative — hover over any day and the clock columns update to show what time it will be in each zone at midnight on that date, which makes cross-timezone scheduling feel almost effortless. I've used it alongside tools like World Time Buddy and the clock widget in Fantastical, and Clocker wins on speed and minimal screen real estate.
- Instant popover with zero loading
- Configurable time formats per city
- Drag-to-reorder location list
- Calendar overlay with forward time projection
- Dark Mode and menu-bar icon customisation
- Sunrise / sunset display per location
Is Clocker free?
Yes — Clocker is completely free to download and use, with no in-app purchases, no premium tier, and no ads.
It is open-source (MIT licence, hosted on GitHub), so anyone can inspect the code, contribute, or fork it. The developer accepts voluntary support but there is no paywall gating any feature. This makes it an easy yes even for the most budget-conscious power user. For comparison, some menu-bar world-clock utilities charge a one-time fee or bundle into larger paid apps; Clocker gives you equivalent daily utility for nothing.
Who should use Clocker?
Anyone who coordinates regularly with people in different time zones will find Clocker indispensable — remote workers, freelancers with international clients, developers on distributed teams, and frequent travellers topping the list.
If your whole team is in the same city, Clocker may be overkill. But the moment you start asking yourself "wait, what time is it in Berlin right now?" more than twice a day, you have a Clocker-shaped problem. I have eight cities pinned — New York, London, Dubai, Karachi, Singapore, Sydney, Toronto, and Tokyo — and the popover answers all eight simultaneously in a panel smaller than a sticky note.
It also fits neatly into a menu-bar-first workflow alongside tools like Bartender, iStat Menus, and One Switch without competing for cognitive space.
What are the best Clocker alternatives?
The closest alternatives are Time Zone Pro (paid, richer calendar integration), Dato (paid, combines world clocks with a full-featured menu-bar calendar), and World Clock by Sindre Sorhus (free, very minimal). For heavy schedulers, Fantastical's menu-bar mode overlaps partially. macOS built-in Clock in System Preferences lets you add cities, but there is no quick-access popover comparable to Clocker's.
Where Clocker wins versus all of them is the zero-cost, zero-account, open-source trifecta. Dato is the only rival I'd reach for instead, and only if I wanted a combined calendar + event management experience — for pure timezone tracking, Clocker remains my default.
How does Clocker compare to Dato?
Dato is a paid app (~$4–6 one-time) that bundles a world clock popover, a proper calendar view with event display, reminders, and menu-bar date/time formatting. It is the fuller-featured tool.
Clocker is narrower in scope but faster to glance at and completely free. If you already pay for Fantastical or Cron for calendar work, Clocker covers the timezone slice without redundancy. If you want one app to rule the menu bar for time AND meetings, Dato is the investment worth making. I run Clocker on machines where I want minimal footprint and Dato on my main setup — both earn their keep.
