Cron has one of the most beautiful calendar interfaces, although, it's relatively limited when looking beyond the beauty.

Since it is free, it's a no-brainer to use in-place of checking Google Calendar directly (assuming you value getting a bit more enjoyment out of your daily calendar experience).

(They were also somewhat recently acquired Notion—oddly enough—likely because they didn't really have a business model).

Cron also has a well-built, native iOS app, which is something to consider.

If you're looking for calendar + scheduler (to replace something like Calendly), you'll definitely want to check out a more time-management tool tool like Motion.

It's not uncommon for someone to use Cron on mobile, and something like Motion or VimCal on their computer.