There are two ways to find out how a camera moved. The first is to record it: many action cameras, drones and some phones and mirrorless cameras log their gyroscope hundreds of times a second while filming. Gyroflow and ReelSteady read that log, correct for the lens and rotate each frame back. Because the gyroscope doesn’t care what the camera was pointed at, this works in fog, at night and over water, and it handles even violent shake on a helmet or a handlebar.
The second is to measure the movement from the picture itself, by following details from one frame to the next. Every other stabiliser in the table works this way, including this one. It needs no special camera or log file, so it works on any clip from any device, years after it was filmed, and it sees sideways and up-and-down shifts that a gyroscope, which measures turning, doesn’t record. It does need something to follow, so a clear sky, open water or a dark scene is harder.
In short: if your footage came with gyro data, use it. For everything else, a picture-based stabiliser is the tool, and the difference between them lies in how carefully the motion is measured, how sensibly the new path is planned and how the edges are handled.