When evaluating alternatives to AppDynamics for performance monitoring, several powerful platforms stand out for their capability, scalability, and modern observability features. Dynatrace is a leading choice due to its AI-driven automation, full-stack visibility, and deep microservices insights, making it ideal for complex enterprise environments. New Relic offers a more flexible pricing model and an intuitive interface, providing strong APM, infrastructure, and log management in a unified platform. Datadog excels in cloud-native and distributed systems with seamless integration of metrics, traces, and logs. ManageEngine Applications Manager serves as a cost-effective option for organizations seeking solid monitoring without advanced complexity. Site24x7 also provides comprehensive application and infrastructure monitoring with simplified deployment.