If there’s one thing that all musicians tend to fret over, it’s pitch. That's a little easier to hear than to try to describe, but when you’re listening to your favorite song being tortured at a local karaoke spot, you’ll know when it’s not being kept in tune by some buzzed bar patron. There are more than a couple of competent iOS apps that use the built-in microphone and/or incoming audio signal, sample it, and check to see if it is indeed in tune, but Tunable puts a truly new, innovative spin on the overall concept. In the process, it delivers on the promise of being a one-stop tuning shop.

If good artists borrow and great artists steal, how do we classify the artists who break and enter but leave the real treasure behind? It’s not difficult to spot the commonalities between The Other Brothers and Nintendo’s classic Super Mario entries. Both are side-scrolling platform games, feature a damsel in distress, and are rendered in wonderful pixel art. Both even star a pair of silly mustachioed men who wear caps and overalls. But The Other Brothers sadly does not capture its spiritual predecessor’s signature feel.

Despite its wide catalog of beloved characters, Disney’s mobile games (like the great Where's My Water?) have often introduced their own leads created especially for each game. The company's latest such entry is Mittens, a physics-based puzzle-platformer starring that favorite of Internet obsessions: Cats. Mittens is strung together by adorable animated cutscenes, which show the irascible titular feline attempting to woo a prissy purple kitty. Every time Mittens tries to give her a gift, she inevitably grows distracted by some other potential sign of affection. As a result, each set of stages introduces a new target gift to win her heart, like milk, balloons, and chocolates.

When it comes to photo-centric social networks, some may shy away from the Facebook-owned Instagram if they prefer a quieter environment for sharing images. But what if you could dial out the noise and actually tame the Instagram experience instead? That’s the premise behind Gramatica for Instagram, a $0.99 app that serves up a handful of features currently overlooked by the photo sharing service. Want to quickly switch between multiple accounts? Prefer to filter out certain tags, photos, or even entire users? Gramatica has your back.