White-label apps can be differentiated by how much access developers want to give clients to the application. With single-tenant white-label apps, developers only create the backend framework of the application and sell this to the customers to create their front-end elements however they wish.
Multi-tenant white-label apps involve the developer creating the front end and backend and providing access to the app through a cloud service. This is the more common pay-as-you-go SaaS model where the developer hosts the software, manages each customer's app data, and offers white-label app customization through an array of pre-built functionalities.
Single-tenant white-labeling offers more front-end customization to businesses, while multi-tenant white-labeling is cheaper for businesses and easier to maintain for developers.