Been free for me. One thing it's not good at, the ring counting. It has more features if you pay(advertised $30/year):
The Mrs got me the $30 subscription and it's been good so far. After a pic it advised us to ad a fertilizer and it made a big difference. My wife has killed 50% less house plants this year.
Download the app, then after opening it, press the cancel top right. Do not press continue and start that trial period. (this message will self destruct in 2 hours, lol)