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Which version of the GWB12 is right for you? The chart below shows the programs and features included with each:

Program Pro Std Ess
GSS GSS is a spreadsheet for manipulating and plotting geochemical datasets ✓ ✓ ✓
Rxn Rxn balances chemical reactions, calculates equilibrium constants, and more ✓ ✓ ✓
Act2 Act2 generates stability diagrams on activity, Eh, pe, pH, and fugacity axes ✓ ✓ ✓
Tact Tact makes temperature-activity and temperature-fugacity diagrams ✓ ✓ ✓
SpecE8 SpecE8 figures concentrations of aqueous and sorbed species, saturation, and gas fugacity ✓ ✓ ✓
Gtplot Gtplot displays data from GSS and the results of running SpecE8 and React ✓ ✓ ✓
TEdit TEdit is a graphical application for quickly and accurately editing and combining thermodynamic datasets ✓ ✓ ✓
React React traces reaction paths involving fluids, minerals, gases, and microbes ✓ ✓  
Phase2 Phase2 computes phase diagrams, "true" speciation maps, and more ✓    
P2plot P2plot renders diagrams computed by Phase2, and plots cross-sections through them ✓    
X1t X1t models reactive transport in groundwater flows in one linear, radial, or spherical coordinate ✓    
X2t X2t simulates reactive transport in two dimensions, including injecting and producing wells ✓    
Xtplot Xtplot renders and animates the results of X1t and X2t simulations ✓    
Feature Pro Std Ess
Spreadsheet for geochemical data ✓ ✓ ✓
Convert chemical units ✓ ✓ ✓
Time series, cross, and ternary plots ✓ ✓ ✓
Piper, Stiff, Durov, Schoeller diagrams ✓ ✓ ✓
Configure Stiff, Schoeller, and Radial diagrams from user interface ✓ ✓ ✓
Multiple Stiff, Schoeller, Radial, Bar, and Pie plots per page ✓ ✓ ✓
Show TDS as circles of varying radius on Piper, other plots ✓ ✓ ✓
Ion balance bar and pie charts ✓ ✓ ✓
Flag non-compliance ✓ ✓ ✓
Calculate mineral saturation and gas fugacity ✓ ✓ ✓
Mix samples ✓ ✓ ✓
Compare replicates and check standards ✓ ✓ ✓
Calculate redox state ✓ ✓ ✓
Check charge balance ✓ ✓ ✓
Compute TDS ✓ ✓ ✓
Eh-pH, activity, and fugacity diagrams ✓ ✓ ✓
Temperature-activity and temperature-fugacity diagrams ✓ ✓ ✓
Solubility diagrams ✓ ✓ ✓
Mosaic (ligand speciation) diagrams ✓ ✓ ✓
Calculate species’ concentration and activity coefficients ✓ ✓ ✓
Redox equilibrium and disequilibrium ✓ ✓ ✓
Use “Pitzer equations” to compute activity coefficients ✓ ✓ ✓
Sorption by Kd, Freundlich, and Langmuir models ✓ ✓ ✓
Calculate electrical conductivity by USGS and APHA methods ✓ ✓ ✓
Ion exchange ✓ ✓ ✓
Two-layer surface complexation model ✓ ✓ ✓
Stable isotope fractionation ✓ ✓ ✓
Gas and mineral buffering; pH-stat ✓ ✓ ✓
Partial pressure model ✓ ✓ ✓
Balance chemical reactions ✓ ✓ ✓
Compute equilibrium constants (log Ks) at temperature ✓ ✓ ✓
Derive equilibrium equations, temperatures ✓ ✓ ✓
Set line colors individually on x-y plots ✓ ✓ ✓
Paste graphs into Word, PowerPoint, Excel, Adobe Illustrator ✓ ✓ ✓
Choose 32 bit or even faster 64 bit version ✓ ✓ ✓
Option to automatically install maintenance releases ✓ ✓ ✓
Edit and combine thermodynamic datasets ✓ ✓ ✓
Create and edit datasets of surface reactions ✓ ✓ ✓
Flexible redox pivoting in thermodynamic datasets ✓ ✓ ✓
Dashboard keeps all your tools in one place ✓ ✓ ✓
Save graphics as eps, pdf, ai, png, emf, svg, and bmp files ✓ ✓ ✓
Plug-in to other programs ✓ ✓ ✓
Control scripts and batch processing ✓ ✓ ✓
Edit thermo and surface datasets in legacy formats ✓ ✓ ✓
Model water-rock interaction ✓ ✓  
Simulate fluid mixing ✓ ✓  
Speciation diagrams vs. pH, etc. ✓ ✓  
Closed and open chemical systems ✓ ✓  
Polythermal simulations ✓ ✓  
Fixed and sliding activity, fugacity ✓ ✓  
Combine equilibrium and kinetic reactions ✓ ✓  
Kinetics of mineral precipitation and dissolution ✓ ✓  
Aqueous complexation and dissociation kinetics ✓ ✓  
Sorption and desorption kinetics ✓ ✓  
Kinetics of redox transformation ✓ ✓  
Enzymes and catalysts ✓ ✓  
Gas transfer kinetics ✓ ✓  
Microbial catalysis and growth ✓ ✓  
Mixed microbial communities ✓ ✓  
Thermodynamic constraint on microbial metabolism ✓ ✓  
Specify form of kinetic rate laws ✓ ✓  
Chain together kinetic reaction paths ✓ ✓  
Turbo scripting speeds rate law evaluation ✓ ✓  
Transient medium and fluid properties ✓ ✓  
Account for heat sources and sinks ✓ ✓  
Report factors limiting time steps ✓ ✓  
Paste any plot into Excel as numerical data ✓ ✓  
Compute phase and "true" speciation diagrams ✓    
Reactive and bioreactive transport ✓    
Multithreaded (parallel execution on multicore chips) ✓    
Advection, dispersion, and diffusion ✓    
Uniform or heterogeneous medium ✓    
Dual porosity (stagnant zones) ✓    
Advective and conductive heat transfer ✓    
Colloidal transport ✓    
Stable isotope transport ✓    
Any number of boundary, injection fluids ✓    
Unlimited number of reaction intervals ✓    
Turn wells off and on, vary pumping rates ✓    
Recirculation wells ✓    
Import flow fields ✓    
Linear, radial, and spherical coordinates in 1-D ✓    
Rectilinear and axisymmetric coordinates in 2-D ✓    
Regular and adaptive grids ✓    
Map view, color mask, and contour plots ✓    
Animation and output for video ✓    
Quick video output to compact frame images ✓    
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