Refprop 91 Free |verified| Instant

The current standard release (Version 10) costs $325.00 for a single-user license.

You can purchase the latest version directly from NIST. While 9.1 is older, purchasing the current version often grants you the most up-to-date data, which is more reliable for modern engineering applications. 3. The Mini-RefProp (Free Version) NIST does offer a "Mini-RefProp" for free. refprop 91 free