KeyWi is described as 'custom keyboard for your iOS device that allows you to type using your computer’s physical keyboard'. There are four alternatives to KeyWi for Mac, Android, iPad and iPhone. The best alternative is Typeeto. Other great apps like KeyWi are Type2phone (Paid), Ezzi Keyboard (Paid) and Mocha Keyboard (Paid).
Typeeto is an app that enables you to use your Mac keyboard as a Bluetooth keyboard for other devices such as iPad, iPhone, Apple TV, Android device, etc. Now use a full-scale keyboard to type in a text and it will be displayed real-time on your device screen.