Hub Keyboard was developed by Microsoft Garage, the company's experimental project division. Its release for iPhones and iPads comes a few months after the app became available for Android phones.
Other Microsoft Garage apps available for iPhones include Fetch, an app that can identify dog breeds, and News Pro, a reader for industry and trade news.
While there is no shortage of alternative keyboards for iPhones, it's not surprising that Microsoft would release one. It bought SwiftKey, widely considered to be one of the most advanced alternative keyboards, in February for $250 million. And as competition for people's default keyboard continues to heat up, even Google is rumored to be developing its own iPhone keyboard.
Here's what using Hub Keyboard is like: