The Cars.com app allows car buyers to research options right from the lot. With information literally in your palm, you can negotiate a better deal by researching specific models, comparing models, and accessing pricing data. Then, you're all set to do battle with that plaid-clad salesman hovering nearby. Cars.com has recently updated their app with a cleaner design, improved photos and navigation. Kelly Blue Book offers a similar app, with a greater focus on vehicle pricing.