Here’s the Deal
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When comparing Diagrams.net vs Diagramo, the Slant community recommends Diagrams.net for most people. In the question“What are the best flowchart / diagram softwares?” Diagrams.net is ranked 1st while Diagramo is ranked 27th.
Specs
PlatformsWeb, desktop
LicenseApache v2 (Github repo too)
PlatformsWeb
TechnologyJavascript, PHP
Ranked in these QuestionsQuestion Ranking
Common Questions
Other Questions
No other questions
Pros
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.
Pro Free
Free and open source.
Pro Export to PNG, JPG, GIF or SVG
Cons
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.
Con Save not working
Online saving does not seem to work, tested with Chrome browser.
Con Website is not secure
No https website.