Abstract: A platform for supporting paint, tools, and other articles is formed of first and second platform members which communicate with a side rail of a ladder tensively and compressively, respectively. Each of the platform members is provided with apertures therethrough, at least one of the members having slot-shaped apertures, for adjustably securing the platform members to one another. In a preferred embodiment, the platform members are provided with respective serrated plate members which communicate grippingly with the side rail of the ladder. The platform may be provided with a paint tray for accommodating a paint can, and a tool or article holder. The present platform can be located anywhere along the side rail of the ladder and does not rely upon the rungs. A safety arrangement includes a spring for applying a biasing downward force which reduces the possibility of accidental disengagement of the platform from the side rail of the ladder.