Does Popper have haptic feedback?
Yes. Tapping a bubble gives a small vibration through the phone as it pops, which is what makes it work as a fidget toy rather than just something to look at.
Dragging across a run of bubbles deliberately does not fire one vibration per bubble — that would buzz continuously — so a sweep stays smooth while individual taps still feel distinct.
Haptics and sound each have their own switch in the app's settings, so you can turn either off.
More questions on the Popper page. Or get Popper on the App Store.