Here’s the Deal
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When comparing UMLet vs Diagrams.net, the Slant community recommends Diagrams.net for most people. In the question“What are the best UML applications out there?” Diagrams.net is ranked 1st while UMLet is ranked 6th.
Specs
PlatformsWindows Linux Mac Web
PlatformsWeb, desktop
LicenseApache v2 (Github repo too)
Ranked in these QuestionsQuestion Ranking
Common Questions
Other Questions
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Pros
Pro Open Source
GNU General Public License
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 Almost discontinued
Some users push fixes, but there isn't any real development flow.
Con Not user-friendly
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.