This post is from a low-reputation account and contains an unverified outbound link. Be cautious before clicking external links.
I have tried a lot of apps, but too often you have only a few basic free guided lessons and then it's cash time with (for me) high monthly/annual prices.
Then I found Insight Timer, where you have a wonderful community, a ton (see below :) ) of guided meditations and timers.
So here we go If you want to try out the app: https://www.insighttimer.com/