Open process simulator

Design your process

OpSim is an open source Chemical Engineering Process Simulator with a user friendly drag-and-drop graphical user interface and an underlying high performance simulation engine.

 Learn about OpSim

 Download OpSim 0.01

Why OpSim?

Fee to use software

We believe that making something great starts with the basis. OpSim is well designed software with the user in mind from the beginning. OpSim is cross-platform and runs equally well on Linux, Windows and Macintosh computers. It comes with a large component and module database. No need to start hacking yourself, but if you want, you can easily extend its functionality with Python.

You are free to use OpSim for any purpose, including commercially or for education. This freedom is being defined by OpSim’s GNU General Public License (GPL).

Blazingly fast

Performance is not just an afterthought, we baked it in from the start!

Properties database

The properties database contains a growing collection of components

Use everywhere

OpSim is platform and architecture independent!

Easily extendable

Every aspect of OpSim can be automated and extended with Python

Free / Open Source

OpSim is an open source project, it's free for commercial use

Get involved

Making OpSim better every day

We always welcome new contributors! OpSim is a huge and ambitious project and there is more work than our small core team can handle. Take a look at the different areas on where you might want to help out with:

  • Developers Are you up for the challenge and want to contribute? Check out OpSim on GitHub.
  • Website If you want to help us maintain the website, please ask on the forum.
  • Non-Developers We are always in need of translators, artists, testers, writers, and anything else you can think of, please ask on the forum.
  • Suggestions Submit suggestions and improvements on our GitHub page to make OpSim better.
  • Report Bugs Help make OpSim a more stable program by reporting bugs.

If you have any questions, please check out the OpSim forum. On this forum the community comes together to help each other out.

  • Physical properties

    Simulations of physical properties of pure components and mixtures

  • Numerical solver

    Simulation of equipment performance

  • Scriptable

    Script and adjust every aspect of OpSim

  • Mass and energy balances

    A great way to make closed energy and mass balances

  • Process simulation data

    Export to applications like Open Office and MS Excel

  • Flowsheet editor

    Build your simulations rapidly from the flowsheet editor