Lenka ( iOS)
If you're looking for a simple app for taking black-and-white shots using your iPhone's camera, Lenka is worth the price.
UpWord Notes ( iOS)
With gestures, theme customization, and plenty of other useful features, UpWord Notes is better than most competing title and a great replacement for Apple's Notes app.
ProCamera 7 ( iOS)
ProCamera 7 could potentially be one of the leading photography apps in the App Store, but unfortunately the bugs and issues in the current build make me recommend that you wait.
Google Drive ( iOS)
An elegant blend of Dropbox-like storage and mobile document editing, Google Drive is a must-have app, especially if you're a dedicated Google user.
Office Mobile ( Android)
Office Mobile is worth downloading if you're a current Office 365 subscriber, but with only basic editing features, this app should be free for all.
Fetch ( iOS)
Fetch is an entertaining adventure for both kids and adults alike, with colorful cartoon-like graphics, an extremely touchable interface full of little items to interact with, and challenging puzzles to solve as you explore a fantastical world.
DragonBox+ ( Android)
No matter how old you are, DragonBox+ is a great tool for learning how to solve basic algebraic equations, even considering its hefty price tag.
The Room ( iOS)
If you like puzzle games, The Room is a unique and addictive app you should get right away, with great visuals, pitch-perfect sounds, and plenty more to keep you struggling to figure out just how to unravel the mystery.
Evernote ( Android)
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.
GarageBand ( iOS)
GarageBand is the best app for music creation on a touch screen. With real-world instruments, true-to-life sounds, and tons of easy-to-use tools, there is simply no other app in its class for iOS.