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The main window of the PyGTK GUI for ASCEND. There are more screenshots.

ASCEND is a free open-source software program for solving small to very large mathematical models. ASCEND can solve systems of non-linear equations, linear and nonlinear optimisation problems, and dynamic systems expressed in the form of differential/algebraic equations.

There is an ASCEND Overview with more information about ASCEND capabilities. Alternatively, you can look at some screenshots or some example problems solved using ASCEND.

Current version 0.9.8: Download (Windows, Linux, Mac)
Please read the Installation notes!

News: ASCEND is migrating to Github, with new CI via Github Actions. (more news)

In this wiki...

This wiki is open to contributions from anyone. All we ask is that you register with your email address. Note that there is some earlier content from our previous website gradually being migrated to this wiki.

Get the source code

ASCEND is free open-source software released under the General Public License.

Source code (as well as binary) releases are available from our download page on SourceForge.

Open access to our github repository is available, or you can browse our code online.

How to participate

ASCEND is currently research-quality software and contributions from users are very much encouraged. If you have a hard problem that you can't solve with ASCEND, please let us know! You might also want to submit bug reports or contact us directly.

We are working on expanding our ASCEND Model Library. Please contact us if you have any interesting ASCEND models that you are prepared to share with us.