What new app did you find this week that you want to share? Addictive game, helpful tool, or something completely different? (Filling in for HUH989 this week.)

Rules:

1. Please form your responses with: [OS] App Name that links to app store location.
2. ONE app only please. Do you like a few? Come back next week and submit your 2nd.
3. You can choose whatever OS you like. iOS, Android, OS X, Windows, Blackberry, whatever.

Example:

[Android] 8sms (Stock Messaging, KitKat) - If, like me, you got yourself a Nexus 5 directly from Google, you may have noticed there's no stock messaging app. The default is to use Hangouts, but I wasn't able to send or receive pictures, and so I eventually started searching for a better app to use. The first one I came across was Sliding Messaging Pro, and if I could I would retract my app recommendation in a previous roundup comment because it wasn't able to handle group messaging or picture messaging and so was not worth the price. I also didn't like the way it would always open your most recent text thread. After that disappointment I searched again and tried out 8sms and have been very happy with it. As promised, it acts like the stock messaging app I had on my Galaxy Nexus, and has some extra settings like emoji, and how to handle group messaging, and incorporates some CM features like quick reply.