Abstract: A safety gate attached to a door and its associated jamb, for preventing passage through the doorway of children, pets, or the like. The gate comprises a net attached to the door and to the jamb. At the jamb, the net is attached to a spring loaded return mechanism which also serves as a take-up reel. This return mechanism is firmly anchored to the jamb. The net is removably attached to the door, so that intended passage through the doorway may proceed. The net has a loop which is slipped over a hook fastened to the door. A flexible net deploys instantly, since it constantly spans the jamb and the edge of the door. It retracts by closing the door, requiring no separate effort or manipulation for closing. The net is stored compactly on the reel when not being used. The net is easily removed from the hook by adults, but far less so by small children.