As long as you have an iPad other than the Pro 12.9-inch or Pro 11-inch, the Osmo iPad Base will fit your iPad.
If you have one of the smaller iPads, it's possible that you need to switch the base inserts to accommodate it. If this is the case, please follow the simple instructions in this video. Suggest getting a pencil with eraser ready to do this.
If, for any reason, you still have a question about adjusting the inserts, please reach out to firstname.lastname@example.org for assistance.