I saw another artist upload a sketch from an app called Bamboo Note. I decided to try it out and it's great. It has the basics. The only thing you should know is that it doesn't zoom, and the left and right edges are sensitive to page flipping.
The Bamboo Note app is designed like a little moleskine with basic pens, pencils and markers. Your works are collected into notebooks and you can page flip through them and instantly start working on your pages. It appears vector based, much like Mischief. It allows exporting to various apps on your android device including social apps. Overall not bad for scribbling ideas that you can take further later. Below is a very quick scribble I did.