5.2 For which problems is ChemApp the better tool, and for which is ChemSage/FactSage?
If you need an interactive, standalone program that can output results in the form of tables and graphs, and can automatically calculate phase diagrams, use ChemSage/FactSage. It is an everyday desktop tool that is easy to learn and does not require programming knowledge at all.
If you need to perform equilibrium calculation from within your own or third-party programs, need to handle complex, repetitive calculations, and want a flexible programmer's library for your projects, use ChemApp.
Needless to say, many users utilise both tools.