Refprop 91 Free [repack]

It is open-source (forever free), cross-platform, and supports Python, C++, MATLAB, Excel, and more.

No. NIST REFPROP has never been freeware. A single-user license for REFPROP 9.1 was ~$325 (later versions are $375+). However:

Because it is proprietary software, finding a legal "free" version—especially for version 9.1—requires understanding how NIST distributes its data and what legitimate alternatives exist. Understanding RefProp 9.1

Avoid the security and accuracy risks of downloading "REFPROP 9.1 free" cracked files. Use the for quick checks, CoolProp for free programming integration, or purchase a genuine license from NIST for mission-critical engineering projects. refprop 91 free

Understanding REFPROP 9.1: Features, Limitations, and Legal Free Alternatives

NIST REFPROP 9.1 is proprietary software and is not officially available for free; it requires a paid license from the National Institute of Standards and Technology (NIST). While version 9.1 is a widely used legacy version, it has been officially superseded by Version 10 , which currently costs approximately for a single-user license. Official Procurement Options

While the full version of REFPROP 9.1 is a paid commercial product, NIST offers a limited, free version for educational purposes: A single-user license for REFPROP 9

: Accessible directly via the official NIST TRC mini-REFPROP portal . Option B: Third-Party Trial Managers

Cracked versions often modify DLL files. A single corrupted byte can alter calculation outputs. Relying on inaccurate thermodynamic data can cause catastrophic design failures in HVAC, aerospace, or chemical processing systems. 3. Legal and Compliance Risks

Searching for "REFPROP 9.1 free download" may point to third-party "software informer" sites or trial versions. Use caution with these sources: Security Risk Use the for quick checks, CoolProp for free

Crucially, while mini-REFPROP is a legitimate free tool, it has significant limitations compared to the full, paid software, and NIST provides no technical support for it due to its limited staff.

NIST does not offer the full version of REFPROP 9.1 or its successor, REFPROP 10, for free. The software requires a paid license to support ongoing research and database maintenance.

While a full-featured standard license of REFPROP is a paid resource, NIST and its partner networks provide specific avenues to access its underlying data engine without a monetary cost. Option A: mini-REFPROP (The Official Free Version)

: Released in 2013, this version introduced a 64-bit DLL and expanded the database to 121 pure fluids. It replaced older NIST 12 and 14 databases and is widely used for interfacing with Excel, Python, and MATLAB.

: It does not allow custom multi-component mixture generation outside of basic air or simple nitrogen/oxygen/methane blends, and it does not come with official technical support.