I just want to say that this sounds like an amazing and much-needed service. I totally understand where the comment from MarcScott is coming from, but from my brief experiences in the edtech world, it definitely seemed like teachers were the ones largely uninterested in helping developers make a better product, not the other way around.

At every edtech or digital learning meetup/conference my developer colleagues and I went to, it was all other developers, non-profits, and edtech startup people, but almost never any teachers. And yet, all of us were dying to connect with classroom instructors! We understood of course that teachers were super busy, but edtech is a two-way street. Teachers have to meet developers at least part of the way if they want edtech products to improve, right?

Anyway, I'm really thrilled that you're finding those teachers who are willing to give feedback and beta test and putting them in touch with developers. I wish this had been around a few years ago.