Afaik these were popular like 5-10 years ago.
I used Hotjar several years ago, and Crazy Egg but was not very impressed
Not so much anymore. I don’t know why, I could be wrong.
But I recall seeing several clients with Hotjar scripts installed indefinitely and slowing the shit out of their website. I would always have to explain to them that heatmap tests should be temporary and then you remove the scripts.