The Little Genius Kit is compatible with most iPads and select Fire tablets. Note that there's a Little Genius Starter Kit for iPad and a Little Genius Starter Kit for Fire, so make sure to select the correct one.
Please refer to this complete list of Osmo-compatible devices:
https://support.playosmo.com/hc/en-us/articles/115010156067-What-devices-is-Osmo-compatible-with-