# CoolProp/CoolProp

Thermophysical properties for the masses

Repository: https://github.com/CoolProp/CoolProp
Canonical: https://ross.abutalabs.com/products/coolprop
Homepage: http://coolprop.org/
Language: C++
License: MIT
License Family: permissive
Topics: fluid-properties, thermodynamics
Last push: 2026-09-02T20:25:06+00:00

## Health v2 (maintenance only)
Score: 92/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 100, release rhythm 78, longevity 100
- inputs: {"age_days": 4494, "days_push": 0, "days_rel": 66, "gap_med": 61, "n_releases_24m": 8}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1067, forks 382 (observed 2026-09-03T02:15:05.385556+00:00)

## What it is
CoolProp is an open-source C++ library providing thermophysical property data for pure fluids, mixtures, incompressible fluids, and brines, with wrappers for many languages including Python, MATLAB, Java, C#, and Excel. It offers functionality similar to NIST REFPROP but free and permissively licensed under MIT.

## Use cases
- look up thermodynamic properties of refrigerants like R134a
- compute water and steam properties with IAPWS-IF97
- calculate humid air and psychrometric properties
- model mixture properties with Helmholtz energy equations of state
- get fluid transport properties like viscosity and thermal conductivity in Python
- replace REFPROP with a free open-source fluid property library
- simulate heat pump and HVAC cycles with fluid property calls

## When to choose
- you need accurate thermophysical fluid properties across many programming environments
- you want a free, commercially usable alternative to NIST REFPROP
- you need fast tabular interpolation for large-scale simulations
- you work with psychrometrics, brines, or incompressible fluids

## When to avoid
- you need experimental data or properties for fluids not in the database
- you require certified reference-grade accuracy for legal or metrological purposes
- you need a GUI-based property calculator rather than a library

## Facets
- artifact type: library
- maturity: stable
- function: simulation, math, sdk
- domain: simulation, cross-platform
- platform: cpp, python, cross-platform, windows
- tags: thermophysical-properties, equations-of-state, fluid-properties, refprop-alternative, psychrometrics, helmholtz-energy, steam-tables, engineering, thermodynamics, linux, macos

## Member repositories
- CoolProp/CoolProp (main) score 92

## Provenance
- Observed fields: from GitHub, fetched 2026-09-03T02:15:05.385556+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:56:53.720104+00:00, confidence not recorded.
  - readme: https://github.com/CoolProp/CoolProp (fetched 2026-09-03T02:15:05.385556+00:00, sha 27a2fc4b9bc9)
  - homepage: http://coolprop.org/ (fetched 2026-08-29T12:58:35.897243+00:00, sha 999ecf2500f4)
- Data as of 2026-08-30T08:39:29.467469+00:00.