Mitchell1 released their first digital repair guides in 1989, and their ProDemand tool is one of the most comprehensive available. ALLDATA's products are Mitchell1's primary competitors, and both companies are popular among mechanics.
Both Mitchell1 and ALLDATA provide products with repair information for the vast majority of vehicles on the road, although vintage cars might require other products. Their products cover both American cars and popular imports. Both companies also sell products designed to streamline a mechanic's day-to-day operations; their tools help mechanics diagnose problems and provide quotes for repair work. Many mechanic schools also work with these programs and provide training for using them in a shop.