Hello and welcome!

I didn't really optimise it for touch device yet. I know that it roughly works as I tried on my wife's iPad 😃

Export/import to and from ldd and ldraw is a huge work. Not so much at a code level but to maintain the conversion database is a massive work. Part origin position and orientation are different in the 3 systems which means that you need to record the transformation matrices for every single piece. It's without talking about differences in part references and flexible pieces...

I know that it would be a nice to have feature but I not ready to commit months of works when I can spend my time improving the website and part library.

One day maybe... 😉

That's ok, it's kind of fun to go back and rebuild stuff anyway.

Here's some screenshots of what Mecabricks looks like on my phone.

http://s2.postimg.org/cx1lsoy89/Screenshot_2016_01_22_21_21_21_1.jpg
http://s22.postimg.org/8mskcdmup/Screenshot_2016_01_22_21_21_42_1.jpg

I have to scroll up and down to select bricks and colors. And the work area is a little small, but it does work.

Phone screens are a bit small to put all the information 😉
With a tablet it is not that screwed and it would be ideal to get good optimized controls - current ones are not that bad but there are glitches any now and then.

Your right, most phone screens are kind of small. But mine has a 5.7 inch screen with a very accurate stylus. If you could just put something in the code to allow the resizing of the work area and maybe add a switch to switch the brick and color selections to drop down menus it might work better on more devices.