Fun, useful - lots of schematic symbols
This is a nice little app, especially for free. It has a lot of symbols, but I have not found a reference as to how they all function and interact. Would be great to see an in app symbol reference and maybe a walk through tutorial. It would also be cool to have some basic pneumatic valves included, and maybe more pneumatics down the road. Hopefully they keep developing more. Would definitely be willing to pay to get a bit more.