The best alternatives to CalPal are Raft Calendar, Timeview, and TimeTree. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of CalPal?
Hurree— The smarter, simpler way to analyze your data
Raft is a calendar app for couples and close friends that want to share plans and find time together.The easy and fun way to share plans and find time together
With Timeview you can do stuff like "show me all my events from my work calendar containing the word 'meeting' and with a duration greater than 2h". The possibilities are almost endless and it's really easy and beautiful.