Windows Phone 8.1 is the best update yet, thanks to its revamped design and modern features, but it lags behind iOS and Android.
The Office for iPad apps are a great middle ground between desktop and smartphone versions, and are a must-have for frequent Office users.
Genius Maps by Mireo shows promise as a sharply designed offline navigation app, but destination input and search could use streamlining.
With new functionality for the Start button and separate experiences for desktop and tablet users, the Windows 8.1 update finally gives people what they want.
Dedicated Lightroom fans will find Lightroom mobile a fine lean-back photo-editing experience, but it needs a little bulking up before it's enough to attract new subscribers to the fold.
With jaw-dropping artistic level design and challenges people of all ages can enjoy, Monument Valley is well worth your money.
If you want an uncluttered, low-maintenance email client that will help keep your inbox organized and empty, Mailbox is the app for you.
If you don't mind the 5GB storage limit, Carousel is an excellent way to share photos and videos.
Dash is a great system for frequent drivers wanting to monitor their gas usage and driving behaviors.
With the ability to use natural language to make appointments and reminders, and a (mostly) intuitive interface, Fantastical 2 for iPad is the best way to manage your schedule.
Union is one of the best for making blended images and double exposure shots, but don't download it if you're not willing to put in the work.
With tons of tracks, unlockable bikes, and several quests, Trials Frontier is a great download for 2D racing fans, but beware the freemium limitations.
With tons of replay value, Wayward Souls is a must-have dungeon crawler that requires both practice and precision to finish even the easiest dungeon.
Piano Tiles is the perfect mix of simplicity and addictive gameplay that's easy to learn, but incredibly challenging to get high scores.
The popular digital automation service IFTTT comes to Android to do all of your tedious tasks for you.
Several customization options make Adobe Voice an excellent free download for creating quick presentations for just about anything.
Even with its tiresome freemium model, Shadow Fight 2 is one of the best fighting games available.
Minuum takes a rather novel and successful approach to a smaller virtual keyboard, but there's no reason to choose it over free services like Swype.