General purpose, full Power Apps capabilities are licensed on a standalone basis. Limited Power Apps capabilities are included within various Office 365 and Dynamics 365 licenses; for more information, review Power Apps use rights included with Dynamics 365/Office 365 licenses.
A high-level overview of the licensing structure:
|Per user, per app||Per user|
|Licensing Scheme||Per app||Per user|
|Description||Allows individual user to run applications* for a specific business scenario based on the full capabilities of Power Apps||Equips users to run unlimited applications based on the full capabilities of Power Apps|
*Each license allows end users to run two custom apps and access one custom portal