Snapseed has released an update to its iOS and Android apps, bringing two new features to its editing suite. You can now apply an HDR effect to your photos using the HDR scape filter and in the Tune Image function there is now the ability to adjust shadows with a dedicated shadows slider. BUT if you're still running iOS 5 or 6 (some people are) please don't update yet. There's a bug that is presenting problems with saving or sharing images when you're running these versions. The team behind Snapseed is aware of this and they're working on an update to address it.
Update! If you're an iOS 5 or 6 user, it's now safe to download. HDR-away.