An apparatus for mounting on an upper portion of a ladder to stabilize the ladder by facilitating a transfer of weight from the ladder to a horizontal or pitched surface in contact with the apparatus. The apparatus comprises a frame comprising a pair of connecting members for attaching to the upper portion of the ladder, a pair of extension arms secured to the frame and having a distance between them that is less than or equal to a distance between the stiles of the ladder, and a plate pivotably attached to both of the extension arms and having a flat surface. The extension arms have means for locking the arms in any one of a plurality of angles relative to a plane defined by the ladder.