Flow Cytometry Software

Frank Battye - Flow Cytometry Consulting

Weasel for Display and Analysis of Flow Cytometry Data

  • New! 19 November 2023 v3.8.1, a bug-fix version of v3.8 is now available. See the new version page for details.
  • All existing licences will be valid for this version.
  • 10 August 2023 The new Weasel revision, v3.8, is now available. Now with a powerful tool for discovering cell population changes by overlaying data files in all dotted display forms (2D and 3D dotplots, 2D and 3D biplots)  (see more..).  Also,  all dotted displays can have dots coloured according to the local cell density in the data space.  
  • Versions available for Macintosh, Windows PC and unix varieties (with Java).
  • A long heritage in exploratory data analysis through innovative visual display techniques.
  • See also the companion program ACluE for cell cluster discovery in multi-parameter data.

Weasel is available for public download.  A fully functional copy can be downloaded free for a 30 day trial.  Thereafter, a small licence fee is required. 


  • Common display forms (histograms, contour plots and dot plots: see the display browser below).
  • Batch mode processing.
  • Exporting merged and/or gated FCS data files. 
  • Export of high resolution graphics.
  • Numerical statistics. 
  • Handles multi-block data (Beckman-Coulter LMD, *Guava, *Cell-Dyn).

Earlier Release 19th May 2022: Weaselv3.7.2 a bug fix version of Weasel: v3.7.1 which was an enhancement of version 3.7 with Parallel Coordinates displays and expansion of the Population Linking technique. [See the New Version page for info]

Browse through displays of some of the features below... 

HISTOGRAMS: May have overlays of differing gates or from different data files. More than one parameter may be shown. Histogram orientation can also be changed to match 2D displays as shown in the inset.


Descriptions of some of the most useful Weasel features that are uncommon or even unique will feature on our Facebook pages. Visit us there from time to time to discover the latest entry. 

For more information, see the links below.


Latest version



Acquire a licence

Return to Frank Battye - Flow Cytometry Consulting

*Guava is a trademark of Millipore Corporation. Cell-Dyn is a trademark of Abbott Laboratories.

Copyright (c) 2015 Frank Battye