What's a good iOS app for tweaking photos on my phone without needing a damn computer?

Alright, so I needed something to fix the lighting on some job site photos after the sun went down. Didn't want to fire up the laptop. Tried a few apps, and Snapseed, even though it's from Google, actually works. It's free, which is a plus, and it's got enough tools to adjust brightness, contrast, and all that jazz. The interface ain't pretty, but it's functional. I even managed to crop out some distracting stuff in the background. It's not Photoshop, but for quick edits on the phone, it's solid. Battery life seems okay so far, haven't had it drain my phone completely yet. The tutorial is useless, but once you figure it out, it's straightforward enough. Gets the job done. I wouldn't call it 'actually rugged', but it hasn't crashed on me yet, and that's saying something.