Best Calendar App for Slack: Official Apps and Add-Ons Compared

Slack does not have a built-in calendar. The best calendar app for Slack is the one Slack builds for your calendar provider: Google Calendar for Slack if your team uses Google Workspace, Outlook Calendar for Slack if it uses Microsoft 365. Both are free, and Slack lists them on its Calendar apps for Slack page. They send reminders with a join button, let you answer invites in Slack, post a daily agenda, share a team calendar into a channel, and set your status to In a meeting while you are in one. Add a third-party app only for what those two do not do: booking links, focus time, leave tracking or birthdays.

A calendar status is text next to your name. Your green or grey dot is separate, and it turns grey after 10 minutes without keyboard or mouse input, meetings included.

Calendar apps for Slack compared

Free Slack workspaces can install up to 10 apps in total, so on the free plan each calendar add-on takes a slot.

Google Calendar and Outlook Calendar for Slack

These two cover what most teams mean by "Slack calendar integration":

• • Reminders with a join button for events that carry a Zoom, Teams, Meet or huddle link.
• • Invites and changes you can accept or decline without opening your calendar.
• • A daily agenda message, and a Home tab with today's and tomorrow's events.
• • Status sync. Slack shows In a meeting during accepted, busy events, and Out of office from out-of-office events. Neither app overrides a status you set yourself.
• • Channel notifications. Add the app to a channel to post a shared calendar's events there. This is how most teams build a team calendar in Slack: a shared Google or Outlook calendar for on-call, releases or office days, piped into one channel.

Setup for each: sync Slack status with Google Calendar and Slack Outlook Calendar integration, which also lists why status sometimes does not update.

When to add a third-party calendar app



Booking meetings with people outside Slack. Calendly's Slack app lets you share your scheduling links in a conversation and posts a message when someone books. Useful for sales, recruiting and support. It does not change your status.

Protecting focus time. Reclaim.ai schedules focus blocks and habits around your meetings and can sync your Slack status to match, so a focus block shows as busy. If you only need to be left alone for a few hours, Slack's own notification pause and focus settings may be enough.

Leave and who is off. Leave trackers such as Timetastic and Vacation Tracker take time-off requests in Slack, post who is out today, and in some setups set an out-of-office status. For a simple team, a shared "Out of office" calendar posted to a channel does the same job for free.

Birthdays and anniversaries. A birthday calendar in Slack usually means a bot. Donut and dedicated birthday apps collect dates from each person and post a message in a channel on the day. There is no birthday field in Slack profiles by default, which is why these apps ask each person for the date.

Does Slack have a calendar? What it has instead

Slack has no calendar view of its own. Features that cover some calendar jobs:

• Scheduled messages. Write now, send at a set time. See how to delay and schedule Slack messages.

• Reminders. /remind sets one-off or recurring reminders for you or a channel; examples are in Slack remind command examples.

• Scheduled status. Set a status with an expiry so it clears on time; see how to schedule a Slack status.

• Workflow Builder. Scheduled workflows post a form or message every Monday, or on a date, which covers stand-ups and recurring check-ins.

Which one should you install?

Check where your team's calendar lives. Google Workspace or Microsoft 365 decides the app.

Install Slack's own app for it, connect your account, and turn on status sync.

Use it for a week. Only if you keep missing something specific, add one tool for that job.

Each extra app is another bot posting in your channels and another permission to review. For most teams, one official calendar app is enough.

FAQ

Does Slack have a built-in calendar?

No. Slack connects to Google Calendar or Outlook through its own free apps. Scheduled messages, reminders and Workflow Builder cover some calendar jobs.

What is the best calendar app for Slack?

Slack's own Google Calendar or Outlook Calendar app, matching your email provider. They are free and set your status from your meetings.

How do I create a team calendar in Slack?

Make a shared calendar in Google Calendar or Outlook, then add Slack's calendar app to a channel and turn on channel notifications for that calendar.

Can Slack show my calendar availability?

Your status shows In a meeting during busy events when status sync is on. Slack does not show your full free/busy calendar to others.

Is there a Slack birthday calendar?

Not built in. Birthday bots such as Donut ask each person for their date and post on the day.