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UCSF ChimeraX alternatives: 3 apps ranked by verified data

Facts checked Nov 1, 2026AppBreakup editorialHow we rank

Common reasons people leave UCSF ChimeraX: commercial users must buy a licence, and not open source under an OSI licence. We ranked 3 alternatives by how directly each one replaces UCSF ChimeraX, then by reviews, real visits and how recently each app's facts were checked against its own website. PyMOL currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1VMD logoVMDFreeNoWindows, macOS, Linux4 of 462.6
2Jmol logoJmolOpen sourceYesWindows, macOS, Linux +14 of 459.6
  1. VMD logo

    1. VMDTop pick

    Best for: Simulation researchers analysing molecular dynamics trajectories

    FreeWindows, macOS, Linux

    62.6

    score / 100

    Why switch from UCSF ChimeraX

    Free viewer better suited to large systems and molecular dynamics trajectories.

    Pros

    • Free download with source code included
    • Handles very large systems and long trajectories
    • Large plugin library and Tcl/Python scripting
    • Pairs closely with the NAMD simulation engine

    Cons

    • Dated interface with a steep learning curve
    • Licence restricts commercial use and redistribution
    • Stable releases come out infrequently
    Visit VMD 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 VMD a good UCSF ChimeraX alternative?

    Verified facts

    4 of 4 verified
    Price
    Free, includes source code
    Checked Nov 1, 2026ks.uiuc.edu(opens source in a new tab)
    Platforms
    macOS, Unix/Linux, Windows
    Checked Nov 1, 2026ks.uiuc.edu(opens source in a new tab)
    License
    Academic, research and internal business use
    Checked Nov 1, 2026ks.uiuc.edu(opens source in a new tab)
    Commercial use
    Requires a commercial licence
    Checked Nov 1, 2026ks.uiuc.edu(opens source in a new tab)
  2. Jmol logo

    2. Jmol

    Best for: Teachers, students and web developers who need a free structure viewer

    Open sourceWindows, macOS, Linux, Web

    59.6

    score / 100

    Why switch from UCSF ChimeraX

    Open-source viewer that also embeds in web pages, useful for teaching.

    Pros

    • Free and open source under the LGPL
    • JSmol embeds interactive 3D structures in web pages without Java
    • Reads a very wide range of chemistry file formats
    • Translated into many languages

    Cons

    • Desktop app needs Java installed
    • Dated look compared with PyMOL or ChimeraX
    • Not built for cryo-EM maps or very large trajectories
    Visit Jmol 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 Jmol a good UCSF ChimeraX alternative?

    Verified facts

    4 of 4 verified
    License
    GNU LGPL
    Checked Nov 1, 2026jmol.sourceforge.net(opens source in a new tab)
    Platforms
    Windows, macOS, Linux
    Checked Nov 1, 2026jmol.sourceforge.net(opens source in a new tab)
    Web version
    JSmol, no Java needed
    Checked Nov 1, 2026jmol.sourceforge.net(opens source in a new tab)
    Requirements
    Desktop app needs Java
    Checked Nov 1, 2026jmol.sourceforge.net(opens source in a new tab)

The best UCSF ChimeraX alternative for…

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

PyMOL logo

Best UCSF ChimeraX alternative for most people

PyMOL

The long-time standard for polished structure figures, with Python scripting.

VMD logo

Best UCSF ChimeraX alternative for a free option

VMD

Free viewer better suited to large systems and molecular dynamics trajectories.

Jmol logo

Best UCSF ChimeraX alternative for open source

Jmol

Open-source viewer that also embeds in web pages, useful for teaching.

PyMOL logo

Best UCSF ChimeraX alternative for Mac

PyMOL

The long-time standard for polished structure figures, with Python scripting.

PyMOL logo

Best UCSF ChimeraX alternative for Windows

PyMOL

The long-time standard for polished structure figures, with Python scripting.

PyMOL logo

Best UCSF ChimeraX alternative for Linux

PyMOL

The long-time standard for polished structure figures, with Python scripting.

Jmol logo

Best UCSF ChimeraX alternative for working in the browser

Jmol

Open-source viewer that also embeds in web pages, useful for teaching.

UCSF ChimeraX alternatives: common questions

What is the best alternative to UCSF ChimeraX?

PyMOL ranks first right now. The long-time standard for polished structure figures, with Python scripting. VMD and Jmol follow it in our ranking.

Is there a free alternative to UCSF ChimeraX?

Yes. VMD (free) and Jmol (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to UCSF ChimeraX?

Yes: Jmol.

Which UCSF ChimeraX alternatives work on Linux?

PyMOL, VMD and Jmol run on Linux.

Why do people switch from UCSF ChimeraX?

The complaints we hear most: commercial users must buy a licence; not open source under an OSI licence; less suited than VMD to analysing long simulation trajectories.

How is this list ranked?

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