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downloads | disclaimer

Welcome to the VisSPA page. VisSPA is protected by copyright but free of charge. Before you download software you need to read my disclaimer (below).

This software is "Hello-ware". When you register on the download server, all you have to provide is a valid email address, but I would love to hear what organism(s) you are studying, and where you are located. The email address allows me to:

VisSPA is a user-friendly Windows program that accepts an alignment of sequences, interactively analyzes frequencies of residues at each position in groups of sequences and supports the generation of sequence logos. The frequency calculations and program name were initially inspired by VESPA (by Gerry Myers and Bette Korber of Los Alamos National Labs). The logos were inspired by the work of Tom Schneider (of NCI) and Jan Gorodkin and colleagues (DTU, Denmark)..

The program (as well as its icon and name) is protected by copyright but is distributed free of charge. Please do not give it to others - just send them here so that I can get some indication of how and where the software is being used. This helps me prioritize projects, prioritize enhancements, and notify users when a new release is available.


I want to acknowledge:

Downloads and version history

To obtain VisSPA: click this link to the download server. If the download server is not working, just write me an email message (address below) and I will kick the server.

Version 1.62 (May 2006) download (4.4 MB) is the only version that has been distributed beyond close colleagues.


This software is supplied as-is, with no warranty of any kind expressed or implied. I have made a reasonable effort to avoid errors in design and execution of this software, but will not be liable for its use or misuse. The user is solely responsible for the validity of any results generated. Specifically, the author and his employer are not liable for any damage or data loss resulting from the use of this software, even if it is due to negligence on the part of the author of this software.

This software and this document are the responsibility of Stuart Ray, M.D. The views expressed herein do not necessarily represent the views of Johns Hopkins University. [Note to human correspondents - you will need to remove "nospam" from this email address for it to work. My hope is that automated readers (spam factories) won't notice.]

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