Calendar 366 II is a native Mac app that surfaces your calendar events and reminders directly from the menu bar, giving you a persistent, at-a-glance view of your schedule without ever opening a full calendar application.
What is Calendar 366 II?
Calendar 366 II is a menu-bar-resident calendar and task companion for macOS that reads natively from Apple Calendar and Reminders. It sits quietly in your top bar and expands on click into a richly detailed monthly grid, upcoming event list, and reminders panel — all without displacing your workflow to a separate window. Think of it as the calendar view Apple forgot to build into macOS itself.
The app is built by independent developer Nspektor and has been continuously refined over many years. It respects the Apple ecosystem rather than fighting it: data lives in your iCloud (or Exchange/Google accounts already wired into macOS), so there is no separate account to create and no proprietary sync engine to trust.
What does Calendar 366 II do best?
Its single greatest strength is the compact but information-dense popover that drops down the instant you click the menu-bar icon. You get a monthly grid, a scrollable day-by-day event list, and your pending Reminders — all rendered cleanly in one panel that dismisses the moment you click elsewhere.
- Mini-month with event dots — colour-coded calendar dots on each day let you spot busy versus free days at a glance.
- Natural-language time display — upcoming events show relative times ("in 23 minutes", "tomorrow at 14:00") so you never have to do mental arithmetic.
- Reminders integration — unlike most calendar menu-bar tools, Calendar 366 II treats Reminders as first-class citizens, letting you check off tasks without switching apps.
- Week numbers — a subtle feature that becomes indispensable in any project-management context.
- Keyboard-navigable — power users can arrow through weeks and jump to dates without touching the trackpad.
I've been using it for several weeks and the detail I keep returning to is how fast it is. The popover appears in under a frame; there is no spinner, no skeleton screen, no loading state. On Apple Silicon it genuinely feels instantaneous.
How much does Calendar 366 II cost?
Calendar 366 II is a paid app available on the Mac App Store. It is a one-time purchase — there is no subscription — which puts it in increasingly rare company in 2024. A free trial period lets you evaluate it before buying, and the price is comfortably in impulse-purchase territory for a productivity tool you will interact with dozens of times a day.
Who should use Calendar 366 II?
Anyone who finds themselves constantly switching to a full Calendar window just to check what time their next meeting is will get immediate value here. That description covers most knowledge workers who live in a browser or editor for hours at a stretch.
It is particularly well-suited to people already embedded in the Apple ecosystem — iCloud Calendar users, those who keep Reminders as a lightweight task list alongside something heavier like OmniFocus or Things 3, and anyone on a 13-inch MacBook where screen real estate is scarce enough that opening a full-screen calendar feels wasteful. If you run a colour-coded multi-calendar setup (personal, work, family, travel), the colour-keyed dots in the mini-month grid will feel tailor-made for you.
It is less useful if your calendar data lives entirely in Google Calendar without any macOS sync, or if you prefer a richer event-creation workflow — Calendar 366 II is deliberately a viewer and quick-action tool, not a full scheduling environment.
What are the best Calendar 366 II alternatives?
The closest direct competitor is Fantastical, which also offers a menu-bar dropdown but extends into a full window-mode app with natural-language event entry, proposal emails, and a subscription pricing model. Fantastical is the right pick if you want a single app to replace macOS Calendar entirely; Calendar 366 II is the right pick if you want a lightweight companion that stays out of the way.
Dato is another strong alternative — it combines a menu-bar clock, calendar, world clocks, and upcoming events in one popover, and is beloved by developers for its density. Morgen takes a different angle entirely, adding time-blocking and task-scheduling on top of calendar viewing. For pure simplicity, the built-in macOS Clock menu-bar item with its notification-centre calendar is free, but it lacks event details, Reminders integration, and any colour-coding. Calendar 366 II lands in a satisfying middle ground: more capable than the system default, cheaper and less opinionated than Fantastical.
How does Calendar 366 II compare to Fantastical?
Fantastical wins on event creation (its natural-language parser is genuinely excellent) and on breadth of features — meeting proposals, Calendly-style availability sharing, and a full weekly/daily view. Calendar 366 II wins on price (one-time vs. subscription), on speed, and on the principle that a menu-bar tool should stay in the menu bar. I reach for Calendar 366 II when I simply want to know what is happening today; I would reach for Fantastical if I were scheduling a meeting with someone external. For most solo practitioners and employees who schedule through their organisation's calendar, Calendar 366 II covers the daily use-case completely.
