Full-screen meeting reminder apps for Mac, compared
Price, license and alert style, as stated by each app's own page. Checked October 12, 2026.
If calendar notifications keep slipping past you, a full-screen meeting reminder is the fix. There are several for the Mac now. Here is how they differ, including ours, with the facts taken from each developer's own App Store page, website or GitHub repository.
| App | Price | Open source | Full-screen alert | All displays |
|---|
| Slapss | Free, no limits | Yes (Apache 2.0) | Yes, the main feature | Yes |
| MeetingBar | Free | Yes (Apache 2.0) | Optional setting | Not stated |
| TimelyMeet | Free | Yes (Apache 2.0) | Yes | Not stated |
| Meetly | Free for 1 calendar, Pro is a one-time purchase | Not stated | Yes | Yes |
| BigReminder | Free for 1 calendar and 1 alert a day, Pro by subscription or lifetime | Not stated | Yes | Not stated |
| Alert Sign | 20 free alerts, then subscription | Not stated | Yes | Yes |
| Here Goes | Paid, one-time, with a trial | Not stated | Yes | Yes |
| Hey Listen | Paid, one-time, with a trial | Not stated | Yes | Yes |
"Not stated" means we could not find it on the developer's own page, not that the app lacks it. Prices and plans change, so check each app's page before you decide. If something here is wrong, email us and we will fix it.
When Slapss is the right pick
- You want a full-screen alert for every meeting on every calendar, for free, with no daily cap and no subscription.
- Your work calendar is Microsoft 365. Slapss signs in to Microsoft directly, so it works even without macOS Calendar, and it unwraps Safe Links, Proofpoint and Barracuda links so Join still works.
- You share your screen a lot. Presenting Now holds alerts until you are done.
- You want to read the code. Slapss is open source and sends your calendar nowhere.
When another app fits better
- MeetingBar if you mainly want a menu bar calendar with a very long list of meeting services, and full-screen alerts are a nice extra rather than the point.
- Meetly if you use several Macs and want snooze and dismiss to sync between them.
- A paid app such as Here Goes or Hey Listen if you prefer to pay once and like their design better. Both offer a trial.
Get Slapss free on the Mac App Store
Questions
What is the best free full-screen meeting reminder for Mac?
Slapss, MeetingBar and TimelyMeet are free and open source. Slapss is built around the full-screen alert, has no limits, and supports Microsoft 365 sign-in directly. MeetingBar is primarily a menu bar calendar with full-screen alerts as an option.
Is there a MeetingBar alternative with full-screen alerts by default?
Yes. Slapss shows a full-screen alert for every meeting by default, on one display or all of them, and keeps the next meeting with a countdown in the menu bar.
Which meeting reminder apps for Mac are open source?
Slapss (Apache 2.0), MeetingBar (Apache 2.0) and TimelyMeet (Apache 2.0).
How was this comparison made?
From each developer's own App Store page, website or GitHub repository, checked on October 12, 2026. We did not include apps whose own pages contradicted each other about whether they show a full-screen alert.