Both Gleason Geometry and Klingelnberg Geometry are widely used for gears, but they differ greatly in several ways. Gleason geometry is more widely used around the world and has a lower overall production cost with more flexible processing method. In production, each tooth is cut one by one, which works well for customized gear projects. Klingelnberg geometry performs more smoothly during gear operation and creates less running noise, but its production cost is higher with more limitations during manufacturing. It adopts continuous cutting for all teeth at once, which brings higher efficiency for mass production.