SwiftKey is a free app so you can install it on as many devices as you like. As long as you are signed into SwiftKey Cloud you can sync you language model and themes to the new device as well.
To install SwiftKey on a new or secondary device follow these steps below:
- In the Google Play Store app, search for "SwiftKey" and Install it on the new device
- Once the app is installed on the new device, sign into SwiftKey Cloud to sync your language model and purchased themes and content to the new device.