The ds has a different type of stylus than iPad. Don try to use a ds stylus on iPad, it can't be good for ur screen and it's not effective (it doesent work at all) iPads use what's called a capacitive touch screen, only certain types of stuluses work on this type of screen (the apple pencil may seem like the same thing as a ds stylus but it don work when it's not on. It communicates In a special way with the iPad pro [the apple pencil only works on two devices, the iPad pro and the iPad pro 9.7 in.] the apple pencil would work on a ds screen because the Ds screen isn't capacitive, it is only touch sensitive, with the apple pencil it's sending a charge into the iPad screen so the iPad knows where the pencil Is touching) basically what I'm saying here is only certain styluses work on that iPad (capacitive styluses and the apple pencil). That's just how Apple built their screens, using capacitive screens is more accurate than simply pressure sensitive.