Latest release

Dymola 2021x is the latest release version. It can be downloaded by registered users from the support center.

Dymola 2021x

Dymola in dark mode.

We are delighted to announce that Dymola 2021x was released on November 27, 2020.

Editing and user interface

Importing FMU code modules is common. It is now possible to precisely control which FMU signals should be exposed or hidden, making the interface easier to use. When drawing diagrams, connections can be automatically routed to avoid existing components.

On popular request, Dymola can be run in “dark” mode for a new experience.


Static simulation (initialization) has become up 2x faster for many common types of models. To help understand the model’s behavior, equation systems can be visualized with a dependency graph.

Model libraries

The Modelica Standard Library 4.0.0 is the default in Dymola 2021x. Automatic conversion scripts are applied when opening models that used MSL 3.2.3.

The new Aviation Systems Library models propulsion and aerodynamics of fixed-wing and rotary-wing aircraft.