You only pay for the number of users who used the app in a month.
Power Apps pay-as-you-go plan which allows individual users to run applications (1 app or 1 portal) without any licenses via Azure subscription. Power Apps per user plan which equips a user to run unlimited applications (within service limits) based on the full capabilities of Power Apps for $20/user/month. This plan provides an easy way for customers to get started with the platform before broader scale adoption. Power Apps per app plan which allows individual users to run applications (one app or one portal) for a specific business scenario based on the full capabilities of Power Apps for $5/user/app/month. General licensing questions How is Microsoft Power Apps and Power Automate licensed? For more details about Microsoft Power Platform licensing, download the Licensing Guide. We’ve included several here with their answers. We have found some common questions on licensing and plan options.