Flow Cytometry Software

Frank Battye - Flow Cytometry Consulting

Weasel for Display and Analysis of Flow Cytometry Data

Weasel is a computer program for off-line display and analysis of flow cytometry data.  Versions are available for Macintosh, Windows PC and for any system with Java (v1.7 or better) installed. 

See also the companion program ACluE for cluster analysis identification and delineation of sub-populations 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).
  • More exotic forms (3D dot plots, population linked displays, pseudo-imaging and biplots).
  • Batch mode processing.
  • Merging and exporting FCS data files. 
  • Export of high resolution graphics.
  • Numerical statistics. 
  • Handles multi-block data (Beckman-Coulter LMD, *Guava, *Cell-Dyn).

NEW! Released 21st November 2019: Weasel: v3.6 with Cluster Discovery On The Fly. [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.

For more information, see the links below.


Latest version



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

Copyright (c) 2015 Frank Battye