NIST maintains REFPROP as a commercial product. As of the last pricing models, a single-user license for REFPROP costs several hundred dollars (around $325–$500 depending on the version and institutional discounts). A site license can cost thousands.
If you are a student, check if your or engineering department already holds a site license. Many academic institutions provide access to the full version of REFPROP 10.0 for research purposes at no cost to the student. refprop 91 free
: Matches REFPROP formulations for the majority of standard technical fluids. NIST maintains REFPROP as a commercial product
Allows you to generate isothermal, isobaric, and isochoric data tables. If you are a student, check if your
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developed by the National Institute of Standards and Technology (NIST) . Searching for a "REFPROP 9.1 free" download often exposes users to malicious third-party websites, software piracy risks, or broken, outdated files.