Abstract: A manually-powered, adaptive ladder lift system for hoisting objects along a ladder to a predetermined height is provided. The ladder lift system may include a stop assembly, a trolley assembly, and a headstock assembly adapted to engage the ladder, whereby the trolley assembly rolls along the side rails of the ladder between the headstock assembly mounted to the top of the ladder and the stop assembly mounted to a lower portion thereof. The headstock assembly is adapted to various types and sizes of ladders. The stop assembly is adapted to retain the trolley assembly at the predetermined height anywhere between the stop assembly and the headstock assembly.