Adobe announced today that it will launch the Adobe XD Starter program for the Windows 10 and macOS platforms. The Adobe XD interaction design tool is completely free to download and use.
The Adobe XD Starter program Adobe XD software itself has no restrictions, but the service is limited, only one prototype and design specifications can be released, and the cloud storage is only 2GB. Of course you can purchase Adobe CC subscriptions to increase the usage of your services.
Today’s announcement also brought in Adobe XD’s May update, mainly to enhance the compatibility of PS and Sketch files, and to set password protection design specifications. Adobe announced that it can expect more advanced prototypes and animations, team collaboration features, and plug-ins.
source:May 2018 Update of Adobe XD