Aspen Plus is a leading process simulation software used in various industries for engineering design and optimization.
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Best HYSYS Alternatives ranked by AI · updated Aug 2026
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HYSYS is a process simulator focused on hydrocarbons, refining, gas processing, and energy applications. It supports steady-state and dynamic modeling with specialized equipment, thermodynamics, and control-oriented workflows.
Top 6 HYSYS alternatives
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
PRO/II is a steady-state process simulator for chemical, petrochemical, refining, polymer, and related engineering applications. It models flowsheets, unit operations, thermodynamic systems,...
Pros
- Broad unit-operation and thermodynamic coverage for industrial flowsheets
- Strong support for refining, petrochemical, chemical, and polymer processes
- Integrates with AVEVA engineering and process design workflows
Cons
- Commercial licensing is typically quote-based and costly
- Interface and workflow can feel less modern than newer simulators
- Less accessible for students and small teams than free alternatives
5
UniSim Design
Honeywell
UniSim Design is a steady-state and dynamic process simulator for oil and gas, refining, chemicals, and power engineering teams. It combines rigorous...
Pros
- Strong connection between steady-state, dynamic, and control studies
- Well suited to Honeywell automation and operator-training environments
- Good hydrocarbon, refining, and gas-processing support
Cons
- Can be less convenient for users outside Honeywell-centered environments
- Chemical-process coverage is not as broad as Aspen Plus in some areas
- Commercial licensing and training can be costly
6
gPROMS
Siemens
gPROMS is a model-based process engineering platform for advanced process modeling, parameter estimation, optimization, and digital-twin development. It is aimed at research...
Pros
- More powerful than PRO/II for custom equation-oriented models
- Strong parameter estimation, optimization, and model-based design tools
- Well suited to dynamic systems and digital-twin development
Cons
- Much steeper learning curve than PRO/II for conventional flowsheets
- Requires stronger programming and mathematical-modeling skills
- Less convenient for quick standard unit-operation studies
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