TIME CALENDAR 17+

I paid and couldn't even open to add things to this calendar.

I've tried a few different calendar apps and I like this one the best because it syncs to Google Calendar but also has nice options to make it aesthetically pleasing and match your desktop. After using it for a week, here are my thoughts:
PROS: you can customize the background image, background image opacity, and text color. It syncs with Google Calendar and there's a "Refresh Calendar" button in the menu to use if it doesn't sync updates automatically. There also ways to add a New Event directly from the app without having to go into Google Calendar separately.
CONS: the first week is free, but after, you'll get near-constant notifications to make a one-time payment to access "Premium" and continue usinng it. The non-renewing fee is $12--a little annoying. I paid it because I like the app well enough. I also wish there were more options for customizing. There are only two ways to change the background image: their preset images, or using images from the iPhone Photo app uploaded from iCloud, so there does not seem to be a way to use images from your desktop computer. The calendar shows each event by listing the hour time first next to the event title, and I wish there was an option to change those settings, but that's my personal preference.

it makes my mac work hard. long to load. and when you click on new event it crashes.