Doing Classic SD in Ventity

Ventity extends the System Dynamics paradigm with a number of features that enable dynamic cohorts, agents, networks and other hybrid simulation features. However, Ventity is pretty great for simple, aggregate dynamic models, too. You don’t need to know about its advanced features to put the entity architecture to good use by automating suites of policy

Ventity 4.4 release

This is a full version 4 release. There are no major new features beyond the many introduced in the v4 beta. The emphasis is on speed and memory improvements in the simulation engine. Diagram tool behavior is a little more Vensim-like, with fewer clicks required to accomplish some tasks, and the toolbar now includes a

Ventity 4 beta release

This is a preliminary version 4 release. New features and improvements: Vector export of charts Slider moves in large models interrupt and restart the current simulation, reducing lag Bar charts Save sliders as a dataset Navigation history for moving forward-back through model diagrams “Select all” for savelists Action logging Macros Components Diagram bounding box and

Community Coronavirus Model

This video explores a simple epidemic model, parameterized for a community confronting coronavirus. The video is in Vensim, but we’ve now translated the model to Ventity: Community corona There’s another copy at, where you can share comments. Also, check back here for updates to the model and a companion video, to be released

Ventity 3.0.2 Released

This is a minor maintenance release. Adds string functions for attribute initialization. Fixes license grace period. Improves consistency of computation when actions are triggered by random events at start of period. Reduces flicker in GIS visualization rendering. Provides control-drag for drawing initial arrows between stocks. Improves lat-lon defaults for GIS visualization with fixed coordinates. Improves

Ventity 3.0 Released

We’re pleased to announce the release of Ventity 3.0. There are many small improvements, plus two big new features: user-defined custom macros: and a visualizer for geospatial data: Check it out!

Vensim Import

This video covers Ventity’s features for importing Vensim models.0:00 – a quick overview of the import feature and how we think about it1:37 – importing a simple model of stock management18:05 – importing a more complex, subscripted competitive market model

Dynamic Simulation > Spreadsheets

This video explores the improvements possible when a complex spreadsheet model is translated into Vensim. The same insights apply with respect to Ventity, and in many cases Ventity’s flexible data infrastructure and dynamic cohort capabilities would provide further advantages.

Ventity 2.1 Release

We’re excited to announce the newest Ventity release: version 2.1 This update comes along with a new option for Encrypting your Ventity models, ensuring only verified users can access your model. Encryption is only available for use in non-evaluation versions of Ventity for security reasons. Along with Encryption, we’ve been working on streamlining the Error