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Gaphor

Flathub·Design & Creative

Gaphor is an open-source modeling tool that supports UML, SysML, RAAML, and C4 notations. It provides a fully compliant UML 2 data model, allowing users to create both simple visualizations and highly complex system models. Designed to be approachable for beginners while remaining powerful for professionals.

Free
Linux
GGaphor logo
Visit Flathub↗

Overview

5 features

In the Design & Creative space, Gaphor takes a focused approach. It focuses on creating and maintaining complex UML, SysML, and architecture diagrams without complex or expensive tools. Gaphor is an open-source project aimed at software engineers and system architects. Gaphor is free to use. It runs on Linux.

Behind Gaphor is Arjan J. Molenaar. Among its 5 catalogued features are UML Modeling, SysML Support, and C4 Modeling.

  • ✓UML Modeling
  • ✓SysML Support
  • ✓C4 Modeling
  • ✓RAAML Diagrams
  • ✓Fully Compliant Data Model

Tags

uml-toolsysml-modelingdiagram-editorarchitecture-modeling

Built with & integrations

Runs on
Linux

Trust & compliance

LicenseProprietary
Verified signals
✓ HTTPS✓ Free tier

Recent events

Latest indexed changes and source events

  1. IndexedJul 19, 8:29 PM

    Gaphor verified by the PulseGate indexer

    Source: PulseGate indexerOpen ↗

Frequently asked questions about Gaphor

What is Gaphor?
Gaphor focuses on creating and maintaining complex UML, SysML, and architecture diagrams without complex or expensive tools. It is catalogued under Design & Creative on PulseGate.
Who should use Gaphor?
Gaphor is an open-source project built for software engineers and system architects.
Does Gaphor have a free plan?
Yes — Gaphor is free to use.
What platforms does Gaphor run on?
Gaphor runs on Linux.
Is Gaphor still active?
PulseGate's liveness checks currently classify Gaphor as active.
What tools are similar to Gaphor?
Similar tools tracked by PulseGate include AxesWeb Accessibility Solution, Teecontrol Course Data, and Three Importer.AxesWeb Accessibility SolutionTeecontrol Course DataThree Importer
Who develops Gaphor?
Gaphor is developed by Arjan J. Molenaar.

At a glance

Platforms
Desktop
Languages
English
First seen
Jul 19, 2026
Activity
🟢 Active
Status
🟢 Active
Built for
software engineers and system architects
Model
Open source
Solves
Creating and maintaining complex UML, SysML, and architecture diagrams without complex or expensive tools.

Developer

Arjan J. Molenaar

Live coverage

Confidence
Medium · 70
Indexed
Jul 19, 2026
Lifecycle
Alive
Activity
Active
First seen
Jul 2026
Last seen
2d ago
Identity audit (9)
Entity ID
cmrs91gmk051r9a3s1254d9nv
Slug
gaphor-flathub-org
Verification state
Indexed for public listing
Claim / listing state
Unclaimed · listed: yes
Index status
Included in index
Latest evidence snapshot
Jul 19, 2026
Timeline basis
Indexed-at chronology (no inferred launch/funding milestones).
Last updated
Jul 21, 2026
Canonical URL
https://flathub.org/apps/org.gaphor.Gaphor

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