Open-source Modelica-based modeling and simulation environment.
Best UniSim Design Alternatives ranked by AI · updated Aug 2026
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UniSim Design is a steady-state and dynamic process simulator for oil and gas, refining, chemicals, and power engineering teams. It combines rigorous flowsheet modeling with control, safety, and operator-training capabilities within Honeywell's process-automation ecosystem.
Developer: Honeywell
Price: N/A
🎯 process.honeywell.com/us/en/products/advanced-automation/unisim-design
Top 6 UniSim Design alternatives
Aspen Plus is a leading process simulation software used in various industries for engineering design and optimization.
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DWSIM is an open-source chemical process simulator that allows the simulation of chemical processes through a user-friendly graphical interface.
CHEMCAD is a process simulation suite for chemical, pharmaceutical, environmental, and general process engineers. It supports steady-state flowsheets, equipment sizing, heat integration,...
Pros
- Generally easier to learn than PRO/II or Aspen Plus
- Covers steady-state simulation, sizing, dynamics, and utility calculations
- Often a practical fit for smaller engineering teams
Cons
- Fewer advanced industry-specific capabilities than AspenTech platforms
- Smaller ecosystem and training community than PRO/II
- Less dominant for large refinery and upstream projects
Petro-SIM is a steady-state and dynamic process simulator for refining, oil and gas, petrochemical, and energy applications. It combines petroleum property modeling...
Pros
- Strong petroleum assay and characterization capabilities for refining workflows
- Supports steady-state and dynamic simulation in one environment
- Includes models suited to crude distillation, hydrotreating, catalytic cracking, and gas processing
Cons
- Commercial licensing is typically quote-based and costly for small teams
- Smaller general-purpose user community than Aspen HYSYS or Aspen Plus
- Less accessible for students and independent users than DWSIM
6
Pro/II
AVEVA
PRO/II is a steady-state process simulation platform for chemical, petrochemical, refining, and energy engineers. It models flowsheets using extensive thermodynamic methods and...
Pros
- Broad coverage of chemical, refining, and petrochemical unit operations
- Strong thermodynamic and electrolyte modeling capabilities
- Established workflows for industrial engineering studies
Cons
- Commercial licensing is typically less accessible than DWSIM
- Interface and workflows can feel dated compared with newer cloud-oriented tools
- Steeper learning curve than CHEMCAD for smaller projects
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