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You can try AppDynamics Pro free for 15 days by signing up for an account on the AppDynamics Portal. At the end of the trial period, AppDynamics Self-Service Pro Trial transitions to the free product edition, AppDynamics Lite.
AppDynamics Lite (other than with EUM agents) provides the same application monitoring and troubleshooting features as AppDynamics Pro. The data retention period is restricted to 24 hours.
Lite provides the following license units:
AppDynamics Lite restricts queries to the last 24 hours both from the user interface and via API. In addition, you can manage five applications on AppDynamics Lite, as well as on AppDynamics Self-Service Pro Trial and Standard editions. To retain history greater than 24 hours and have unlimited applications, upgrade to AppDynamics Pro.
See http://www.appdynamics.com/pricing/us/ for information on changing or buying licenses.
When the trial period ends and AppDynamics detects an expired AppDynamics Pro Trial license, the Controller resets all agents. See information on resetting app agents in Manage App Agents.
After the reset, the Controller limits agent registration to one each of the Java Agent, the .NET Agent, the PHP Agent and the Node.js Agent. The Controller permits the first agent of each type to register and use a license.
AppDynamics recommends you uninstall any agents you don't use. For instructions on how to uninstall an agent, see the uninstall topic corresponding to your agent type under Install App Server Agents.