Skitch compare (Android)

Skitch's quick-and-simple photo annotations are certainly a nice addition to the Evernote suite of products, but we still wish it had a few more tools in its belt.

If you're looking for a full-featured note-taking app that syncs across all platforms -- or just an easy way to keep track of your digital odds and ends -- Evernote is the best I've seen for Android.

If you are looking for an app that is essentially a digital pad of colored sticky notes for grocery lists and quick reminders, then Google Keep is perfect. Otherwise, look elsewhere or wait until this newborn gets upgraded with more powers.

PushBullet is the easiest way to get files, links, notes, lists, and addresses from your desktop computer to your Android device.

If you would like to go back to your early days of learning math using pencil and paper, this app lets you relive those moments, writing math expressions naturally while delivering solutions immediately.