The Creative Board, included in the Creative Set, has been made to fit the Osmo base, with corners that prevent it from shifting. It works with any iPad that fits in the Osmo base:
iPad 2, iPad (3rd Generation), iPad (4th Generation), iPad Mini, iPad Mini 2, iPad Mini 3, iPad Mini 4, iPad Air and iPad Air 2.
Osmo is also compatible with the new iPad Pro 9.7", and the hardware should be set up just like the iPad Mini (i.e. the base adapters will need to be adjusted accordingly). Please see this link for setup instructions.
Please note that Osmo is not compatible with the iPad Gen 1. Osmo is also not compatible with the iPad Pro 12.9" at this time (we are working on a solution to this for future release). Regarding the 10.5" iPad Pro, we expect to have an answer on this in Summer 2017.