Adobe XD debuts as a free Mac public preview Formerly known as Project Comet, the app is targeted to UI, UX and mobile app designers working on a large number of screens and product models.

Thanks to a collaboration between Google and Adobe, it's now possible to use the Adobe XD design tool to create UI for Flutter apps.

Update: Adobe has provided more information on the submission and review process for XD’s new plugin system: Plugins need to be registered through our Adobe I/O console.