smooth loading, nice graphs, can check new functions use, etc
popular paid tool for user analytics
popular tool for seeing how people are using your app
can migrate a sub-site
great list
for site traffic. with funnels and a/b testing
great if making a tutorial or sharing code on socials
smartly crops person from profile pick and suggests like twenty cool background images, compiles person with and gives output quick and easy
great for landing pages, personal site, simple one page sites.