The application server is a Java-based framework that implements Java EE platform APIs and provides the standard Java EE services. Planon uses JBoss WildFly as its application server. To further improve the server security, Planon uses a hardened and customized version of WildFly, not the out of the box version.

The application server is the place where the business logic of the Planon application resides. This application data is used by various client applications in Planon through various protocols.