Was definitely interested, clicked through a bunch and wanted to see pricing and sign up. Unfortunately it's a "contact us for more info" situation, which is really a non-starter as far as I'm concerned.
The opaque pricing is a sign that they've moved up the market to target enterprise. When a company reaches that stage, it's basically telling you, "if this turns you off, then you won't move the needle for us so we don't want to talk to you."
Rainforest uses human testers, a specialized Amazon Turk. You write a test plan in English that is followed. They can also explore your app and write that test plan in English for you.
I'd love to know of a service that will write the test plans in Selenium or Ghost Inspector etc.