Here’s the Deal
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When comparing Whimsical vs PlantUml, the Slant community recommends Whimsical for most people. In the question“What are the best flowchart / diagram softwares?” Whimsical is ranked 8th while PlantUml is ranked 21st.
Specs
PlatformsWindows, Linux, Mac, Web
PlatformsWindows, Linux, Mac, Web, Chrome
TechnologyJava
Ranked in these QuestionsQuestion Ranking
Common Questions
Pros
Pro Free version
Pro Many, many integrations
For example from Emacs, Sublime Text and so on. You can learn about integrations here.
Pro Easy create diagrams from text
There is even a Visual Basic Macro to draw UML diagrams in Word.
Pro Free/libre/open source (GPL)
Source code can be browsed here.
Pro Has online editors
Such as.
Pro sphinx-contrib extension for embedding into docs
sphinx-contrib extension on PyPi
Allows you to keep your UML definitions under VCS and include them inside generated documentation with ease.
Cons
No cons yet!
Con The "plantUML-language" is a bit strange and hard to grasp for new people
Con Slow development due to it being mostly a one-man project
There’s been no recent contribution to the source forge project but from the administrator arnaud_roques. Future contribution might be difficult due to lacking code documentation.