Ctrl for iPad is compatible with any iPad capable of running iOS 11 or higher, (see all iOS11 compatible iPads). From an installation perspective we recommend iOS 11.3 or higher due to improvements in charging and battery longevity introduced in this version.
We have designed Ctrl for iPad to be as optimised as possible.
Dependant of your intended use case, Ctrl for iPad can require incredibly few resources when triggering commands from an interface and is easily handled by older iPad models.
If your main intention is to use Ctrl for iPad for playback of simultaneous audio and video cues and overlapping linear interfaces, you may wish to look at a newer model of iPad with higher integrated graphics and processing power to manage this.
If you are still unsure, the best option is to download the demo version onto the iPad in question and try it for yourself to determine if the performance is suited to your specific use case.