thermo
The premium Open Source alternative to Aspen HYSYS
🎯 Best for:Chemical engineering property calculations.
What is thermo?
Replaces the property calculation modules of Aspen Plus and HYSYS. It offers a comprehensive library of 20,000+ compounds with rigorous thermodynamic and phase equilibrium models.
Tech Stack
PythonChemistry & Materials
Why thermo?
- • Massive compound database
- • Rigorous EOS models
- • Pure Python/NumPy stack
Limitations
- • No graphical interface
- • Steep learning curve
- • Performance vs C++ engines
7/10/2026
Last Update
136
Forks
11
Issues
MIT
License
Financial Leak Detected
Stop the "SaaS Tax"
Your team could be burning cash. Switching to thermo instantly boosts your runway.
Competitor Cost
-$1,440
/ year (est. based on Aspen HYSYS)
Self-Hosted
$0
/ year
Team Size10 Users
150+
SAVE 100%