For single‑point properties (not mixture curves), the NIST WebBook is free and browser‑based. It uses the same underlying REFPROP routines.
If you’ve landed on this page searching for “REFPROP 10 free download 2021,” you’re likely a chemical engineer, thermodynamics researcher, or HVAC professional. REFPROP is the gold standard for calculating fluid properties, but confusion about its availability often leads users to seek unauthorized free copies. refprop 10 free download 2021
This article explains why you can’t legally download REFPROP 10 for free in 2021—or any other year—and provides safe, affordable alternatives. For single‑point properties (not mixture curves), the NIST
If you need the software for professional or academic work, here is how you should acquire it: In 2021, NIST charged a one-time license fee
Why was there such a high demand for REFPROP 10 in 2021? The update introduced several critical improvements:
NIST does not offer REFPROP 10 as freeware. The common myth of a “free 2021 version” stems from:
In 2021, NIST charged a one-time license fee of $325 for government/academic users and $650 for commercial users. No subscription, but no free full version either.
