Refprop 91 [hot] Free Jun 2026

If you are currently using REFPROP 9.1, should you switch? Here is a quick comparison:

For educators and students, NIST provides an excellent, 100% and legal alternative: mini-REFPROP . This is an official teaching tool, not a "cracked" version of the full software.

RefProp 9.1 free is suitable for a wide range of applications, including:

If your goal is to analyze refrigeration cycles (which is the primary use case for REFPROP), the model from NIST often includes some functionality. 3. Academic Access

No. REFPROP is commercial software distributed by NIST. It requires a purchased license to use legally.

REFPROP (Reference Fluid Thermodynamic and Transport Properties) is a critical software database developed by the ⁠National Institute of Standards and Technology (NIST) . It is the gold standard for engineers and researchers who need accurate thermodynamic properties—such as density, viscosity, enthalpy, and vapor pressure—for pure fluids and mixtures.