Keyboard cases used to be one of the most popular third party accessory categories for Apple tablets. From 2011 to 2017, this was a booming field with several companies like Belkin, Logitech and ZAGG offering strong alternatives for all models of iPad.
However, they haven’t taken off quite the same way for the iPad Pro, as Apple introduced the Smart Connector and its own keyboard product in the Smart Keyboard. There were at least a few third party options for the first two generations of the iPad Pro, but new models became scarce after Apple’s major redesign came in 2018. Other than a couple of options from Logitech and Brydge, the well seemed to dry up for newer iPad Pros.