Download UCSF ChimeraX

ChimeraX Release Candidate ()

Please try these candidates for the next production release. See the change log for a list of improvements since the last production release. If needed, new candidate releases with bug fixes are made before the production release is made. If your work depends on a bundle provided by the ChimeraX Toolshed, you may want to defer updating until the bundle has also been updated to work with this version.

ChimeraX

Production releases are stable versions for ChimeraX Toolshed bundles to work with. You may need to use an older release if a bundle you wish to use has not been updated yet. Showing releases for .

Daily Build

Daily builds are generated automatically each night from the development source code (see the change log). While a given build may have unforeseen problems, these are often fixed by the next day. Showing releases for .

Technology Preview Build

This build uses PySide6, an alternative to PyQt6, as its UI library. The interface should not change in any user-visible way.
This build adds an experimental option to the volume command, 'surfaceAlgorithm', which can take 'marchingCubes' or 'flyingEdges' as values. Flying Edges is being tested as an alternative to our default surface generation algorithm, Marching Cubes, since it offers significantly faster surface generation. Making that step faster can reduce time-to-first-draw by 1.5-2x on average. On Linux, this build additionally depends on libgomp and will install it as a prerequisite. Windows and macOS users will not have to install any additional packages.