I recently started botting in OSRS, I used to bot >5years ago and I clearly notice the difference between the client. I think it was p****bot, **** and rsbot that I'd just back in the day. And I can't exactly recall which client it was, but it seemed like they smoothed mouse movement out after a click. So the mouse still dragged on a bit after clicking or moving to a target and it also curved more and didn't move in a straight line.
I've tried ***** first and especially the mouse movement seems a dead giveaway.
