Tumblr: A massive update that dropped this week has made Tumblr better than ever. It now works in offline mode, includes support for Spotify and high-res images, and is easier to tap. You're going to be blogging from your phone more often. Free.
Cloth: Not only does this neat fashion app let you save, categorise and catalogue outfits, it also automatically tags them with the current conditions. So if you ever wonder if this skirt and shoes are OK, even though there's a torrential downpour outside, it will help you figure it out. Free for a limited time.
Carat: It sucks when you're that obnoxious person who shows up to dinner and has to find a spot to plug in your phone. But if you download Carat, you might never be in that boat again. It monitors your phone to tell you how every app is affecting your battery life. Then it suggests which ones to kill and how much time you'll gain if you do. Free.
Display Recorder: This one goes out to all the people helping their parents with their gadgets When you need to tell someone how to do something on an iPhone, sometimes it's hard to explain. But this app records what you're doing on your device, so you can help your mum learn how to use Skype with a simple video demonstration. $1.99.