Seq Diagram Alternatives

Sites and apps similar to Seq Diagram include PlantUML, which is free and open source. Other options are Mermaid and reladraw. In total there are three Diagram Editors like Seq Diagram for Mac, Windows, Linux, self-hosting and Android.

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Seq Diagram alternatives page was last updated Oct 1, 2026

PlantUML
121 likes
PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams. The generator can be run anywhere within JVM and integrated with various application such as wiki, text editor, IDE, programming language, documentation generator, and others.
126 PlantUML alternatives
Cost / License
Free
Open Source
Application typeApplication types
Diagram Editor
Mind Mapping
Origin
France
EU
Platforms
Mac
Windows
Linux
Online
Android
Chrome OS
France
EU
Good alternative?Is PlantUML a good alternative to Seq Diagram?
Mermaid
35 likes
Ever wanted to simplify documentation and avoid heavy tools like Visio when explaining your code? This is why mermaid was born, a simple markdown-like script language for generating flowcharts, Gantt charts and sequence diagrams from text via JavaScript.
35 Mermaid alternatives
Cost / License
Free
Open Source (MIT)
Application typeApplication types
Diagram Editor
UML Modeling
Origin
Sweden
EU
Platforms
Mac
Windows
Linux
Online
JavaScript
Node.JS
Self-Hosted
Cloudron
Sweden
EU
Good alternative?Is Mermaid a good alternative to Seq Diagram?
reladraw
Like
reladraw is a text language for diagrams where you say where things go.
Cost / License
Free
Open Source (Apache-2.0)
Application type
Diagram Editor
Platforms
Self-Hosted
JavaScript
Typescript
npm
Mac
Windows
Linux
Good alternative?Is reladraw a good alternative to Seq Diagram?

3 of 3 Seq Diagram alternatives