Yes, we have an on-premise version of facial recognition API.
It's an SDK (software development kit). It's works faster because you don't need to send requests to the Internet and it doesn't require Internet connection.
The cons of SDK is that it's more expensive and you need to develop all the logic. API is much easier to implement and it's cheaper. Also API is more suitable for distributed systems and website.
For all the questions regarding SDK, please write us to firstname.lastname@example.org