Microsoft 365

Outlook's calendar, without Outlook.

You need to see the day and answer an invitation, not open a mail client. InstaCal brings the Microsoft 365 calendar into the menu bar, joins Teams calls in a click, and lets you reply to invitations without leaving the panel.

Download on theMac App Store

$29.99 $19.99 once. One purchase includes InstaCal for Mac, iPhone, iPad and Apple Watch. No subscription, InstaCal account or ads.

Microsoft 365 in InstaCal, in short

Signing in
Through your browser, the standard Microsoft sign-in. The token is stored in your macOS Keychain.
Teams meetings
Teams links are detected in the URL, location or notes and turned into a Join button before the call starts.
Invitations
Accept, decline or reply tentative from the panel — with a comment, or silently, skipping the email entirely.
Conflict checking
Before you reply, InstaCal shows what the invitation collides with in your existing schedule — the other event by name, the exact minutes in dispute, and both drawn on one timeline.
Emailing guests
Before a change touches an event's guests, InstaCal asks whether to email them — the same Send / Don't Send choice Google Calendar offers — for edits, reschedules, moves, deletes and new invitations.
Duplicates
A meeting that arrives through both your Microsoft and Google accounts is shown once, not twice.
Alongside
Works next to Apple, Google and Microsoft 365 — plus iCloud, Fastmail, Yahoo, Fruux and any other CalDAV server, signed in inside InstaCal rather than in System Settings.
Invitations

Answer it where you saw it.

The invitation card is also a conflict-checker.

Conflicts, before you commit

The invitation card shows the day it lands on and what it collides with, so "yes" is an informed answer.

Yes, Maybe or No, inline

Reply from the panel or straight from the notification banner. No mail client, no browser.

Reply with a comment — or silently

Say why you're declining, or skip the email entirely and just update your status.

One bell for everything

Pending invitations and active alerts share a single indicator, so there's one place to look.

A conflict with a way out

An overlap gets a card of its own: what it collides with, the exact minutes in dispute, and both events on one timeline. Click it for an open time to move to, a shorter version, or Busy turned off.

Not every overlap is a problem

An event that only falls outside your working hours reads as a note, not an alarm — and a calendar you can see but cannot act on can stay out of conflict checking entirely.

FAQ

Common questions

Does InstaCal work with Microsoft 365 and Outlook.com?
InstaCal signs in to Microsoft accounts through your browser and reads the calendars that account exposes, so Microsoft 365 work and school calendars come through alongside Apple and Google ones.
Can I accept and decline meeting invitations?
Yes — Yes, Maybe or No, from the panel or from the notification banner. You can attach a comment or reply silently, and InstaCal shows what the invitation conflicts with before you answer.
Will Teams links be detected?
Yes. Microsoft Teams is one of the services InstaCal recognises, and it looks in the event's URL, location and notes to find the link.
What happens when two meetings overlap?
The event gets a conflict card naming the other one, the exact minutes in dispute and a timeline drawing both on one axis. Click it and InstaCal offers the ways out: an open time to move to, shortening the event, or marking it free. An overlap that only sits outside your working hours reads as a note rather than an alarm, and a calendar you can see but cannot act on can be left out of conflict checking altogether.
Do I need Outlook installed?
No. InstaCal talks to your Microsoft account directly; the Outlook app is not required.
Does InstaCal collect any data?
No. InstaCal contains no analytics and no tracking. Your account tokens and app passwords live in Apple's Keychain, and your events sync directly between your device and your calendar provider — there is no server of ours for your data to visit.
How much does InstaCal cost?
InstaCal is $19.99 once, down from $29.99. One App Store purchase includes the Mac, iPhone, iPad and Apple Watch apps. There is no subscription, separate mobile purchase, Pro tier, InstaCal account or in-app purchase.
InstaCal app icon

The work calendar, one keystroke away.

Teams in a click, invitations answered without opening mail.

Download on theMac App Store

$29.99 $19.99 once. One purchase includes InstaCal for Mac, iPhone, iPad and Apple Watch. No subscription, InstaCal account or ads.

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