Gaphor

Gaphor is ranked #6 of 24 in UML modeling software on The Geeks Club. It runs on Linux, macOS, Windows. There is a free plan.

Gaphor plans and pricing

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Gaphor Free 100% open source · Apache 2 license gaphor.org · 29 Sept 2026

Compared on UML modeling software

Free plan: Yes
UML diagram types: Class, Component, Action, Sequence, Interaction, State Machine, Use Case, Deployment, Information Flow
Code generation: Yes
Team collaboration: Yes
Deployment: desktop
Supported platforms: Windows, macOS, Linux
Model repository: Yes

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Gaphor

Purpose: Gaphor is a modeling application for UML, SysML, RAAML, and C4 used to visualize and document applications and systems.
Modeling standards: Gaphor implements a fully compliant UML 2 data model and the UML, SysML, and RAAML OMG standards, and supports the C4 model.
Diagram types: It supports diagrams including Class, Interaction, State Machine, Block Definition, and Requirements diagrams, and lets users mix diagram items.
Model styling: Users can customize diagrams with a built-in styling engine.
Extensibility: Gaphor can be extended with plugins and users can access their own extensions through the GUI or CLI.
Export: Gaphor exports diagrams as SVG, PNG, PDF, or EPS and can batch-export every diagram in a model.
HTML reports: It can generate a self-contained, static, interactive, read-only HTML report of a model that requires no server or backend to view.
Scripting: Gaphor can be used as a Python library with scripts or Jupyter notebooks to inspect, generate, or update models.
Documentation integration: Gaphor provides a Sphinx extension for embedding its diagrams in reStructuredText or Markdown documentation.
Support: The project provides community contact through Matrix chat and accepts issue reports through GitHub.
Windows distribution: Windows users can download an installer or portable version, or install Gaphor with Winget.
macOS requirement: The download page says Gaphor requires macOS 10.15 or newer and provides ARM and Intel installers.
Linux distribution: The download page recommends Flatpak for Linux and also lists Arch and Debian/Ubuntu packages.
Price from: Free

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Where it ranks on The Geeks Club

Best UML Modeling Software in 2026#6 of 24

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Sources

gaphor.org· checked 29 Sept 2026
docs.gaphor.org/en/latest/exporting.html· checked 29 Sept 2026
docs.gaphor.org/en/latest/scripting.html· checked 29 Sept 2026
docs.gaphor.org/en/latest/sphinx.html· checked 29 Sept 2026
gaphor.org/download/· checked 29 Sept 2026