Is there a way to make it universally available? I'm thinking of a web app mostly. I don't have an Android phone at hand right now, but this looks like something that should have existed ages ago, congrats.

(To answer the question: Linux for me)

To make it more clear: a web version would make it instantly available to every modern mobile device holder (let it be Android, iOS, Windows Phone), plus anyone on the desktop with a tablet. I might even prefer using it with a mouse, just drawing things instead of selecting shapes from a list.

drawing shapes using mouse.. IMO, not very usable

I can make it for desktop but without touch screen, the shape recognition is not useful. Probably a web version can work well for desktop.

Points against that:

- I can have a wacom (or similar) device connected to the desktop

- I can even .. use my android tablet as mouse/touchpad/wacom simluator

The benefit: The result instantly on a bigger screen (and maybe even a really big screen if I connect the desktop/laptop to a projector or something).

If there's not something out there to use an Android/iOS tablet in place of a wacom, there should be!

I know you can't see upvotes here, so I hope it's not useless to post a 'me too' type post. Just to say I'd definitely pay for this on a desktop, I doubt I can draw more accurately with my finger than a mouse and your algorithm isn't bad at all - I have no doubt it'd translate brilliantly.

Actually I think you might be wrong about that, the shape recognition and the way you draw a simple line between two objects to join them would be useful even with a mouse.

Some of us have touch screens on our PCs too :).

This is something I'd pay £20-30 ($30-$50) if it was available on a PC, hell combined with a digital whiteboard (and with a couple more features) and you'd have something most developers would give a left arm for!.

Ubuntu Linux please :) (why not make it cross platform).

Just bought the Android version :)

Android...