For the iPad 2 any standard capacitive stylus should work, these styluses are unpowered (so they don't use Bluetooth) and they work like a finger. Some Adonit or Wacom styluses may work with the iPad 2 but the newer ones will likely not due to changes in Bluetooth connectivity. I'd suggest checking the sites for Wacom and Adonit specifically if you are trying to find a stylus that supports pressure sensitivity on your device. ArtRage should work fine with any from those two companies that are supported by your device.