ChemApp is used in programs from such areas as process simulation and optimisation, computational fluid dynamics (CFD), solidification and casting simulation, crystal growth, kinetically controlled production processes, etc. The ChemApp web page contains examples from several application areas.
In general, ChemApp can be applied in all areas where ChemSage and FactSage have already been successfully applied, a brief list of which is given in the table below.
| Sintering | Aluminium electrolysis |
| Roasting | Silver alloys with SiC |
| Purification of metals | Casting processes |
| Waste treatment | Incineration |
| Heat treatment cycles | Electron beam melting |
| Alloy research studies | Ore reduction |
| Precipitation studies | Corrosion |
| Dispersion strengthening | Castings |
| Hard metal compounds | Extraction |
| Combustion | Electronic materials |
| Nitrates in water | High TC superconductors |
| Steels | Ceramics |
| Tungsten halogenides | Slags |
| Cement manufacture | Molten salts |
| Dioxine | Organics |
| Glasses | Geochemistry/planetology |
| Silicides |