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Visual MINTEQ – a free equilibrium speciation model


Note to all users: this site is no longer updated. For the most recent downloads, go to Please update your bookmarks!

Updated 5 December 2021. This is the main download page of Visual MINTEQ. Below you can download the most recent version, or selected older versions if the latest version doesn’t work for you. Various databases can also be downloaded. Currently, I use the Google and OneDrive platforms to distribute the software. Disregard the message saying that “We’re sorry, this file type is not currently supported” and click on the Download button. If the links don’t work please send me an e-mail!

Visual MINTEQ version 3.1

Posted by Jon Petter Gustafsson on November 26, 2020

Visual MINTEQ 3.1 can be downloaded from the following links:



Last modified 26 November 2020.

This is the official 3.1 version. This version relies on .NET Framework 4.5 and is adapted for Windows 8 and 10 users. Most Windows 7 users should also be able to use it without any problems – however, in case it does not launch, please download .NET Framework 4.5 from Microsoft and then try again. The version of 26 November corrects an error in the numerical optimization routine of the previous version, which caused poor convergence for some “pH from mass balance” problems.

Installation instructions: 1. Uninstall any previous version of Visual MINTEQ, 2. Save the file (link above) to your computer. 3. Extract the setup file from the zip file. 4. Click “setup.exe” to initiate installation. When using the software the first time, you will need to decide where to put your user-editable files. The default location is in the My Documents folder.

For information on the release of new versions, discussion etc., join the Visual MINTEQ group on Facebook.

Visual MINTEQ version 3.0

Posted by Jon Petter Gustafsson on August 15, 2016

This version from October 2012 is still available on the site although I strongly recommend version 3.1 as it includes a number of bug fixes not addressed in version 3.0. The OneDrive link is:

Last modified 18 October 2012.


Older Visual MINTEQ versions

Posted by Jon Petter Gustafsson on April 8, 2010

If you have a very old Windows operating system (i.e. Win98 or earlier), or if your .NET Framework doesn’t work, you can download version 2.40b from January 2006 below, which was the last version that did not use .NET Framework at all. Note however that this version lacks a large number of new functionalities present in later versions. OneDrive link:

Last modified 23 January 2006

Alternative thermodynamic databases

Posted by Jon Petter Gustafsson on April 8, 2010

In general, I recommend the use of the databases that accompany the standard version of the program, as included in the above setup package. However, there are other alternatives. Below are the databases of MINTEQA2 (version 4.0) and Lindsay’s databases, adapted for the Visual MINTEQ format in 2003. Unzip the files to your folder of user-editable files (this folder is defined on “Parameters” – “Various default settings”). Read the “readme” file before using any of these databases. The OneDrive links:

Visual MINTEQ thermodynamic databases in GWB format
Posted by Jon Petter Gustafsson on April 8, 2010

In 2005, the Visual MINTEQ thermodynamic databases were formatted for use with Geochemist’s Workbench. The zip file below contains three files, one thermodynamic database for GWB 5 or later, one for GWB 4, and one additional database for surface complexation reactions onto HFO (Dzombak & Morel, 1990). Extract all three files before use with GWB. See more details here.