It's still in beta, so there are some kinks to iron out, but it is a pretty great little tool. One of my favourite things about it is that it enables collaboration by allowing users to create hybrid sketches by adapting what others have created (the original also stays in tact).
You don't need an account and it's free to use - so give it a go!
Here are some of my favourite sketches from the last few weeks:
(for those of you viewing this on a reader - I'm sorry but you'll need to click through to the actual post to see the images... as I said, still working out some glitches.)
By studiobrazley
By bkcl
By bkcl
By Caro Wallis1
By Mearso
By Sianz
By Handy Bite Size
By Rich_R
By Speak Criptic
By Mark Turner