Solid Collage app for free

I checked out 3-4 collage app and this one is very easy to use, no ads, and no watermarks. A clear winner.
Wish list: let us build custom frames with square and rectanglular shapes. At least give us some obvious stuff like 2 and 3 sets of everything. I want 3 squares side by side. I can choose a 9x9 and crop it but shouldnt have to.

_Everdusk about Diptic, v8.0.3