CHEAQS Next

Current version


The current version of CHEAQS Next is 2019.5, dated December 2019. An additional version is under development, including the MSA_model, but only for 64-bits operating systems.

Next release


The current plan is to stop development of the current 32-bit version (just maintenance) and to focus entirely on the new 64-bit version. A first version (still incomplete) is available for 'sneak preview'.

Version History

2019.5 (December 2019)

This version has in total twenty amino acids in the database.

2019.3 (24 September 2019)

This version has five more amino acids added to the database so ten in total.

2019.2 (9 July 2019)

This version has five amino acids added to the database. In addition, a bug was fixed that caused adsorption to be skipped when organic complexation was also included.

2019.1 (27 February 2019)

This version has DTPA added to the database. In addition, some small bugs were fixed.

2018.1 (24 October 2018)

This version has citrate added to the database. In addition, some errors in the database as well as some small bugs were fixed.

2017.3 (7 July 2017)

A fourth model for organic complexation was added, the one developed by Cabaniss & Shuman (1988). Furthermore, equilibrium definitions for gas-solution-equilibria can be displayed. Also, a utility was added to delete user files in case the program is uninstalled.

2017.2 (14 March 2017)

Two more titration types were added, including a real chemical titration with volume change. Also, titration graphs can be shown in log-mode.

2017.1 (7 January 2017)

A third titration type is added.

2016.3 (17 September 2016)


2016.2 (11 June 2016)

Pie graphs added as output option, log-values show during output and some bug fixes.

2016.1 (13 January 2016)

Main new feature is the option to add items to the database interactively.

2015.3 (23 August 2015)

You can manipulate the database by removing or changing cations, ligands and species in an entirely new, easy-to-use interface (adding items to the database is foreseen for the near future).

In addition, CHEAQS Next remembers recent input and output files (if you like).

Convergence for high ionic strength samples was improved.

2015.2 (24 June 2015)


2015.1 (1 January 2015)


2014.0.9.4 (5 May 2014)

2014.0.9.3 (4 April 2014)

A bug causing a fresh installed program to hang was corrected. Sorry for inconvenience.

2014.0.9.2 (30 March 2014)


2014.0.9 (19 January 2014)

Some features that are included in CHEAQS Pro are not yet implemented in CHEAQS Next, such as calibrations.