Source: http://www.engadget.com/2013/09/19/google-makes-its-quickoffice-app-free-for-both-android-and-ios/
Less than two weeks after Apple decided to make iWork free for new iOS devices, Google went and did us one better: it's offering its Quickoffice suite for free, to both Android and iOS users. If you recall, the apps have actually already been free to Google Apps subscribers, specifically, but now the offer applies to anyone, regardless of when they activated their device or what OS version they're using. As an added incentive, if you sign in to your Google Account from the Quickoffice app by September 26, 2013, you get 10 gigs of extra storage space for two years. And that's all there is to it. Hit up the source link for more details, if you need them, or else find the app on Google Play or the App Store.
Source: Google (Google+), Google Play, iTunes