Widgets are simple to develop, and are mainly useful for displaying extra information within the agent interface.
Full apps require more advanced development skills. They can make bigger changes to the agent interface. They’re also packaged for easy distribution and upload to other Deskpro helpdesks (useful if you’re developing an integration between your software and Deskpro that you want to make available for all Deskpro customers.
See the Developer Manual for full details.