The best alternatives to iCultus are Superpowered, Itsycal, and Calendar by 44. If these 3 options don't work for you, we've listed a few more alternatives below.
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Itsycal is a tiny menu bar calendar. If you want, it will display your events as a companion to the Mac Calendar app. Itsycal has Dark Mode, ISO week numbers, a customizable system clock replacement, and more.
Designed from the ground up for unrelenting speed and blazingly fast calendaring. It’s just one seamlessly scrolling collection of months tightly integrated with a to-do manager, and a new kind of intuitive flow for creating events.
Sometimes simple calendar notifications are not enough. You need a reminder IN YOUR FACE. The app will interrupt your workflow when it is time to go to your meeting by displaying a full screen reminder showing WHAT, WHEN and WHERE.