Inline is designed to consume and display content from a variety of Esri software; the Esri licenses required to author and publish content are available from your Esri distributor.
Inline uses the modern ArcGIS pattern and ArcGIS Identities to author and access applications. You must have at least a Creator user type (formerly, a Level 2 user) or a GIS Professional user type to create content in Inline. An Esri portal (ArcGIS Online or Portal for ArcGIS Enterprise) and the ArcGIS Identities themselves are also available from your Esri distributor.