ResMap (Resolution Map) is a Python (NumPy/SciPy) application with a Tkinter GUI. It is an easy to use software package for computing the local resolution of 3D density maps studied in structural biology, primarily electron cryo-microscopy (cryo-EM).

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Requires 64bit architecture.
Tested on Windows 7+.


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Requires Mac OS X 10.6+.
Tested on 10.7+.


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Requires 64bit architecture.
Works on Fedora14, CentOS6, and Ubuntu 12.04.


Your distribution not supported?
Grab the source code.


Please read the manual for installation and usage instructions. Download manual

Simple interface. Cross-platform GUI.

ResMap provides a clear graphical interface. You can easily load your 3D density map (MRC format) and input your voxel spacing. Optional inputs are provided and explained right in the same window.

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Visualization? Your choice of 2D, 3D, or both.

ResMap outputs a 3D volume the same size of your input volume. You can immediately see the results with in-house 2D visualizations. If you have UCSF Chimera installed, ResMap can also animate the result in Chimera. (Thanks, Tom!)

Prefer the command line? We have that covered, too.

The exact same functionality can be accessed via the command line. This is useful if you want to batch process many volumes.

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If you find ResMap useful in your work, please consider citing us:

A. Kucukelbir, F.J. Sigworth, and H.D. Tagare, Quantifying the Local Resolution of Cryo-EM Density Maps, Nature Methods. Volume 11, Issue 1, Pages 63-65, 2014.

You may read the paper here:


For questions about the software and bug reports:

For general questions: or {fred.sigworth, hemant.tagare} [at]