Eventually Synalyze It! was released now also in the Mac App Store. Unfortunately the versions you find in the MAS and here on this site are not the same.
First, I had to remove some features due to MAS rules (synalyze shell tool and automatic online update as well as the automatic suggestion of grammars available on this site). Additionally in the version you get here are some fixes made while the version in the MAS waited for approval more than two weeks.
Hopefully I can keep both versions better on the same state in the future.
Thanks again for all the positive feedback, version 1.0.3 is already in the works :)