Google launched something just awesome yesterday, it is called Gboard. It is essentially an iOS (iPhone) keyboard add on but it technically brings Google search directly into every app that you use a keyboard with on iOS. The best part, the keyboard is amazing and works as well or even better than Apple's native keyboard.
I've tried many third-party keyboards with iOS and always went back to Apple's native one but Gboard, I feel like I am missing nothing and only gaining.
Here is a quick video showing off the keyboard:
See, it is that cool and it works amazing. The GIFs search is so much fun as well. The autocorrections work just great and the typing is fast and smooth.
I am normally not that much of a fan of everything Google does, but if you use iOS, I highly recommend you try it out by downloading the app.
Of course, the cool part for Google is they get all this data and additional search query traffic from these iOS users, at least the ones who switch to this keyboard.
Forum discussion at Google+.