There are many, many keyboard apps in the Play Store, but Google Keyboard has long been my go-to option. With the Gboard re-branding, Google added a few long-awaited features like multiple active languages and integrated search. That was enough to push it over the 500 million download threshold, joining apps like Photos, Dropbox, and Super-Bright LED Flashlight.
The bracket Gboard has entered is technically 500 million to 1 billion.
Gboard (formerly Google Keyboard) hits 500 million installs in the Play Store was written by the awesome team at Android Police.