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McXtrace - Monte Carlo Xray Tracing, is a joint venture by
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Our code is based on technology from 
Code repository (shared with 'McStas') is located at github.com/mccode-dev
For information on our progress, please subscribe to our user mailinglist..
- To download the latest release: download area
- For installation instructions :
- For a quick list of the available commands: commands
Recent McXtrace News
Migrating from McXtrace 1.x to 3.x? - Use the wiki-based guides
January 7th, 2026: McStas and McXtrace 3.6.5 released
McStas and McXtrace release 3.6.5 is now available.
McXtrace installation instructions are found on GitHub .
What's Changed - Main Changes:
Bugfixes, new features, all common to McStas and McXtrace:
- macOS bundles in 3.6.1 did not actually install that version but something earlier. Fixed by pinning in yml file, @willend in #2285
- PDF manuals had wrong version numbers, @willend in #2285
- Allow mcrun / mcdisplay to run / visualize without access to .c/.instr by @willend in #2281
- mcgui/mxgui editable font colors, handle long filenames without extreme window resizing by @willend in #2275
- Fix cross-platform sort-order issue in PowderN by @willend in #2272
- Platform-independent reflection list sort in Single_crystal by @willend in #2273
- mcrun/mxrun: feature addition - scan by seed by @willend in #2276
- Add mcplot toggle to "plot 1D-curves from 0-value" in linear mode by @willend in #2278
- Add commentstring to vim editor by @Lomholy in #2284
Other stuff
- %Example adjustments, McXtrace by @willend in #2269
- Test_SANS/Test_SAXS, supplement stats by x10 SPLIT by @willend in #2270
- Use ${{ matrix.mpi }} to ensure different output dirs by @willend in #2271
- Fix indentation bug - issue #2279 by @willend in #2280
- Temporarily disable this instr from McXtrace tests by @willend in #2283
Full Changelog:https://github.com/mccode-dev/McCode/compare/v3.6.1...v3.6.5
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