I wanted to do some estimation on what kind of revenue 1M apps could bring but their pricing page consists of "enter your email and we'll contact you shortly".
Seems weird they haven't passed the invite only phase at 1M apps served.
It's not "invite only". It's just a trick to seem exclusive. They have an automated email go out a few minutes after you request an invite that gives you instructions on how to sign up that seems like it's coming from an actual person (unless I'm mistaken, in which case whoever is managing these invites is superhuman).
If you wait for the animation to load, you'll see that it's free (even for enterprise features). They are owned by twitter (in case you're wondering how it could be free).
Seems weird they haven't passed the invite only phase at 1M apps served.