CarGurus: Used & New Cars establishes itself as the leading automotive marketplace application in the United States, leveraging extensive inventory data and proprietary valuation algorithms. The platform aggregates millions of vehicle listings from dealerships and private sellers nationwide, providing users with what claims to be the largest selection of available vehicles among competing services. The application's core functionality revolves around its Deal Rating system, which analyzes thousands of data points including historical pricing trends, vehicle condition reports, market comparisons, and geographic factors. This algorithmic assessment provides color-coded ratings (Good, Fair, Overpriced) that help users quickly identify potentially favorable transactions. Additional features include financing calculators, trade-in valuation tools, and direct messaging systems for contacting sellers. The app also incorporates vehicle history reports from third-party providers, though access to full reports may require separate purchases. User experience demonstrates thoughtful design with intuitive filtering options that allow precise searches by make, model, price range, mileage, and vehicle history indicators. The interface presents search results in both list and map views, facilitating local market exploration. Real-world usage patterns show most users engage in comparative shopping across multiple listings, with many utilizing the 'Saved Searches' feature to receive alerts when new vehicles matching their criteria become available. User feedback consistently highlights the application's comprehensive vehicle information and time-saving capabilities. Reviewer Nick11554 (September 2, 2025) noted the importance of history filters in their purchasing decision, while Ordinary Jane_4188 (September 2, 2025) praised the accurate descriptions that reduced research effort. Multiple reviews from long-term users, including nick_9167 (September 11, 2025), emphasize the application's reliability and consistent performance across years of use. The application demonstrates particular strength in market transparency and data aggregation, though limitations include occasional inventory synchronization delays between dealership systems and the platform. Some users report varying response rates from sellers through the messaging system. The platform serves most effectively as a research and discovery tool rather than a complete end-to-end transaction platform, with final purchases typically requiring offline completion at dealerships.