Here’s the Deal
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When comparing StarUML vs Diagramo, the Slant community recommends Diagramo for most people. In the question“What are the best flowchart / diagram softwares?” Diagramo is ranked 27th while StarUML is ranked 36th. The most important reason people chose Diagramo is:
Free and open source.
Specs
PlatformsWindows, Linux, Mac
PlatformsWeb
TechnologyJavascript, PHP
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Pros
No pros yet!
Pro Free
Free and open source.
Pro Export to PNG, JPG, GIF or SVG
Cons
Con Based on Electron (HTML/CSS/JS)
The interface is not native. The looks are okay, but the responsiveness is awful sometimes.
Con Save not working
Online saving does not seem to work, tested with Chrome browser.
Con Website is not secure
No https website.