Altinn Studio, together with Altinn Apps and Altinn Platform is the solutions that makes a complete application development and hosting platform.
The design-time solution for developing, testing and maintaining applications.
Altinn Apps is the solution where all the apps created in Altinn Studio is hosted.
Altinn Platform is the solution where the supporting platform functionality resides.
ALtinn CLI is a command line application that can be used by service owneres to access Altinn Api's. The application has as standard implemented functions for creating Altinn Applications and insatnces, functions for fetch and store application data. ALtinn CLI can be found on the GIT repo https://github.com/Altinn/altinn-cli. The application can be used as standrad or extended with custom function devloped by the service owners themselves.