Field Service Dynamics 365 is a free mobile application developed by Microsoft Corporation. It is a next-generation Field Service app powered by Dynamics 365. The app is designed for field service workers and comes with robust offline capabilities, allowing them to access and interact with data, even in remote areas without internet connectivity. The app also features periodic data sync, which keeps the back-office informed of work being performed, so that appropriate actions can be taken.

Built on the Microsoft Power Apps platform, Field Service Dynamics 365 is entirely customizable and allows field service workers to define what types of data they can access. Overall, this mobile application is an excellent tool for those in the field service industry, providing them with the necessary features to perform their job efficiently and effectively.