Rock & Dirt is a free Android app developed by TAP Publishing Company. It is the world's largest construction equipment resource since 1950, providing a one-stop-shop for buyers and sellers. The app features thousands of listings for construction equipment, including bulldozers, excavators, wheel loaders, and backhoes. Listings are from local and international dealers, private sellers, and auctioneers, with all major brands like Caterpillar, Komatsu, John Deere, Volvo, and Case.

The app offers up-to-date auction information, including past auction results, which is vital for tracking industry price trends. With advanced search functionality, users can search as broadly or narrowly as they wish, then sort the results using various criteria. The app provides complete listings with all information seen on the website, including photos, full descriptions, and a variety of seller contact options. Users can easily contact the seller via phone or email, get directions to the listing, or view the seller's website in their preferred browser. Additionally, users can view upcoming industry auctions and events and add them to their personal calendar through the app's Events Calendar.