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StarUML alternatives: 4 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave StarUML: no real-time collaboration, and licence is per device. We ranked 4 alternatives by how directly each one replaces StarUML, then by reviews, real visits and how recently each app's facts were checked against its own website. Visual Paradigm currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Gaphor logoGaphorOpen sourceYesWindows, macOS, Linux4 of 462.6
2PlantUML logoPlantUMLOpen sourceYesWeb, Windows, macOS +24 of 459.6
  1. Gaphor logo

    1. GaphorTop pick

    Best for: Students and engineers wanting a free, approachable UML or SysML modeller

    Open sourceWindows, macOS, Linux

    62.6

    score / 100

    Why switch from StarUML

    Free, open-source UML and SysML modeller.

    Pros

    • Free and open source
    • Real UML 2 model, plus SysML and C4
    • Simple interface without hidden panels
    • Runs on all three desktop platforms

    Cons

    • Fewer features than commercial modellers
    • No team repository or real-time collaboration
    • Small community
    Visit Gaphor Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Gaphor a good StarUML alternative?

    Verified facts

    4 of 4 verified
    License
    Apache 2.0
    Checked Oct 25, 2026gaphor.org(opens source in a new tab)
    Standards
    UML, SysML, RAAML
    Checked Oct 25, 2026gaphor.org(opens source in a new tab)
    macOS requirement
    macOS 10.15 or newer
    Checked Oct 25, 2026gaphor.org(opens source in a new tab)
    Linux install
    Flatpak recommended
    Checked Oct 25, 2026gaphor.org(opens source in a new tab)
  2. PlantUML logo

    2. PlantUML

    Best for: Engineers documenting software with UML diagrams kept as text in the repo

    Open sourceSelf-hostableWeb, Windows, macOS, Linux, Self-hosted

    59.6

    score / 100

    Why switch from StarUML

    Write UML as text and keep it in the repo, for free.

    Pros

    • Very broad UML coverage
    • Plugins for most IDEs and documentation tools
    • Can be self-hosted as a rendering server
    • Free and open source

    Cons

    • Default visual style looks dated
    • Local use needs Java installed
    • Syntax has many inconsistencies between diagram types
    Visit PlantUML Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is PlantUML a good StarUML alternative?

    Verified facts

    4 of 4 verified
    Open source
    Yes
    Checked Oct 25, 2026plantuml.com(opens source in a new tab)
    License
    LGPL-3.0 (repo); GPL and other builds offered
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Licensing options
    Several licences, GPL build is most complete
    Checked Oct 25, 2026plantuml.com(opens source in a new tab)
    In-browser rendering
    JavaScript rendering engine
    Checked Oct 25, 2026plantuml.com(opens source in a new tab)

The best StarUML alternative for…

The highest-ranked app in this list for each need.

Visual Paradigm logo

Best StarUML alternative for most people

Visual Paradigm

Heavier suite with team repositories and round-trip engineering.

Gaphor logo

Best StarUML alternative for a free option

Gaphor

Free, open-source UML and SysML modeller.

Lucidchart logo

Best StarUML alternative for a free plan you can upgrade

Lucidchart

Browser-based UML with real-time collaboration for teams.

PlantUML logo

Best StarUML alternative for open source

PlantUML

Write UML as text and keep it in the repo, for free.

PlantUML logo

Best StarUML alternative for self-hosting

PlantUML

Write UML as text and keep it in the repo, for free.

Visual Paradigm logo

Best StarUML alternative for Mac

Visual Paradigm

Heavier suite with team repositories and round-trip engineering.

Visual Paradigm logo

Best StarUML alternative for Windows

Visual Paradigm

Heavier suite with team repositories and round-trip engineering.

Visual Paradigm logo

Best StarUML alternative for Linux

Visual Paradigm

Heavier suite with team repositories and round-trip engineering.

Lucidchart logo

Best StarUML alternative for iPhone and Android

Lucidchart

Browser-based UML with real-time collaboration for teams.

Visual Paradigm logo

Best StarUML alternative for working in the browser

Visual Paradigm

Heavier suite with team repositories and round-trip engineering.

StarUML alternatives: common questions

What is the best alternative to StarUML?

Visual Paradigm ranks first right now. Heavier suite with team repositories and round-trip engineering. Gaphor and PlantUML follow it in our ranking.

Is there a free alternative to StarUML?

Yes. Visual Paradigm (free plan + paid), Gaphor (open source), PlantUML (open source) and Lucidchart (free plan + paid) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to StarUML?

Yes: Gaphor and PlantUML. PlantUML can also be self-hosted.

Which StarUML alternatives work on Linux?

Visual Paradigm, Gaphor and PlantUML run on Linux.

Why do people switch from StarUML?

The complaints we hear most: no real-time collaboration; licence is per device; smaller user community than older modellers.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces StarUML, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.