Ultralights and Spam Cans - as above!!!
Modern designed high speed aircraft - not so much.
Angle of attack indicators, airspeed, and outside air temp fed to computer.
Approaching stall = stick shaker - this is the warning system.
Approaching stall by a lesser margin = stick pusher - this is stall prevention system.
Have tested many of them as the aircraft is trimmed nose up - power back - and watch the airplane do it all by itself. Nice gentle oscillations.
On the other end of the spectrum is the mach trim system. When aircraft speed build up to sensed critical point - before mach tuck will occur - the stick pull will gently cause the aircraft to climb and bleed off speed. Again all by itself. Nice gentle oscillations as the speed bleeds down and the stick pull releases - then aircraft speeds up etc.
So a correctly functioning computer system can actually prevent stalls from taking place if the crew lets it.
Source of information - Bombardier Lear 31 maintenance training manual that I am currently revising my training notes for. One of many aircraft with the above 2 systems.
Mx