When comparing ScreenCube vs Diagrams.net, the Slant community recommends Diagrams.net for most people. In the question“What are the best tools for creating app mockups?” Diagrams.net is ranked 5th while ScreenCube is ranked 6th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro 3D Interaction
Fully interactive 3D scene for a deep level of customization and flexibility when creating mockups.
Pro Web-based
Can use on any device in your browser.
Pro Rich functionality for a web-based application
Pro Integrates with multiple cloud storage services
Draw.io offers saving files directly to services such as Google Drive, OneDrive or Dropbox along with saving to to computer.
Pro Real-time collaboration
Pro Great flexibility customizing text labels
Pro Completely free
Pro There is also a Desktop version
Pro Good list of different output formats
Draw.io supports export for PNG, GIF, JPEG, PDF, SVG, HTML, and XML.
Pro Internet Explorer 6-8 and touch device support
Draw.io works with every browser (even IE 6) without plugins.
Cons
Con Still in Beta
Con Import from Visio .vsd is useless
Even simple diagrams get all scattered.
Con Behaves strangely for certain diagram types
For example the snapping function for arrows doesn't work properly for the sequence diagram template.