AppDynamics and New Relic are prominent Application Performance Management (APM) tools with distinct focuses, catering to different market segments. AppDynamics excels in providing end-to-end stack visualization and dynamic baselines, making it suitable for enterprises, while New Relic prioritizes response time metrics, appealing to startups and small to medium-sized businesses. Both originated from Wily Technology and share features like backend, mobile, and frontend monitoring, but differ in their approach to alerting and reporting, with New Relic using the Apdex score and AppDynamics relying on dynamic baselines. AppDynamics offers deeper database insights and on-premise solutions, whereas New Relic provides a more startup-friendly pricing model and supports additional programming languages like Ruby and Python. Both tools enable integration with various services and offer plugins, but New Relic's integrations are considered richer. Ultimately, the choice between them depends on the specific needs of the business, with AppDynamics being more suited for enterprises seeking customized solutions and New Relic being more accessible for startups with its transparent pricing.