Vensim is industrial-strength simulation software for improving the performance of real systems. Vensim’s rich feature set emphasizes model quality, connections to data, flexible distribution, and advanced algorithms. Configurations for everyone from students to professionals.

Vensim is used for developing, analyzing, and packaging dynamic feedback models. We emphasize:

  • High quality, with dimensional consistency and Reality Check™
  • Connections to data and sophisticated calibration methods
  • Instant output with continuous simulation in SyntheSim
  • Flexible model publication
  • Model analysis, including optimization and Monte Carlo simulation

Vensim contains many industry-leading technical advances in simulation technology.

Read more in the Vensim brochure.


Vensim Pro and DSS licenses with current maintenance now include a Ventity subscription! Learn more.


See our Comparison Chart for different Vensim configurations.

Latest Release – Vensim 10.2.0

Vensim 10 is now ready for download. See the release notes for details.

Professional & DSS

Read the Vensim Brochure. Vensim Professional is what is needed for managing large and complicated models. It provides Causal TracingTM of structure and behavior, and has Monte Carlo sensitivity, optimization and subscripting (array) capabilities. Vensim DSS adds an interface development tool for creating management flight simulators, external functions and macros, compiled simulations, and more.

Custom Vensim applications (flight simulators and other interfaces to models) can be developed with the Venapp builder, or in a programming language such as Visual Basic, C, C++, Visual C++, Delphi, Excel, and multimedia authoring tools, or in Sable (below).

PLE Plus

Vensim PLE Plus bridges the gap between the inexpensive (or free) PLE and our higher configurations. PLE Plus is fully featured for its price point and includes data connectivity, multiple views, Monte Carlo sensitivity simulations, game simulations, and the new model-user interface (Input and Output Controls).


Vensim PLE (Personal Learning Edition) is software that gets you started in system dynamics modeling and is free for educational use and inexpensive for commercial use. Vensim PLE is ideal for classroom use and personal learning of system dynamics.

Model Reader

The Vensim Model Reader is free software which allows you to publish models constructed with Vensim and distribute them to other people. Your model and the Vensim model reader can be copied and passed to as many people as you want, giving people access to your model without their needing to purchase Vensim.


The Molecules software is used for constructing system dynamics models from “chunks” or molecules of system dynamics structure. This software is a collaborative effort among a number of authors.

History of Vensim

The history of Vensim is here.


Ventana Systems is committed to complying with Section 508 of the Rehabilitation Act when providing electronic and information technology solutions to our customers. We incorporate the Section 508 design guidelines into our software user interface planning and our website.

To help meet this commitment, both Vensim and our website satisfy federal guidelines for accessibility under Section 508, requiring federal agencies to ensure that information technology is accessible to persons with disabilities.

If you have difficulty accessing the information on our web pages, or have ideas or comments that would help us improve the accessibility and usability of our website or the information available on our website, please contact us. Please indicate the nature of your accessibility problem, the web page you were visiting or feature of Vensim you had trouble with and we will be happy to help.

Vensim is Y2K compliant.