FREEDOM251

Freedom251 › Physics Simulation Software

ASCEND

by ASCEND

Free plan LinuxMacWindows

Visit ASCEND Alternatives Pricing

ASCEND's own site

What ASCEND is

ASCEND is free desktop software for engineers and scientists working with mathematical models and systems of equations. Users build larger models from smaller submodels using a specialized modeling language. It solves nonlinear equations, linear and nonlinear optimization problems, and dynamic systems expressed as differential/algebraic equations. Its graphical interface lets users load models, select a solver or integrator, and inspect the solving process. ASCEND also handles measurement units and conversions, including between inches, feet, centimeters, meters, and kilometers. Thermodynamics capabilities cover distillation and flash problems and include IAPWS-IF97 steam tables. The interface is available through C, C++, and Python, and Python scripts can automate model loading and solving. External libraries can add solvers, integrators, methods, relations, and import handlers; external methods can be written in Python. ASCEND runs on Linux, macOS, and Windows, is released under the General Public License, and the homepage identifies version 0.9.8 as current.

Who it suits

ASCEND suits engineers and scientists who need to model and solve systems of equations, including optimization or dynamic-system problems. It may also suit users who want to automate solving through Python or extend the software with external libraries.

What it does well

  • Free and released under the General Public License.
  • Supports several equation and optimization problem types.
  • Includes unit handling and conversions.
  • Python scripts can automate model loading and solving.
  • Available for Linux, macOS, and Windows.

What to know first

  • The homepage identifies version 0.9.8 as current.
  • The tool is focused on modeling and solving equations.

Plans

PlanBilled and limitsPrice
ASCENDFree open-source softwareFree

As ascend4.org lists them, read 11 Oct 2026. The maker's own page has the final word.

Getting started

  1. Visit https://ascend4.org/.
  2. Choose the download or installation route for Linux, macOS, or Windows.
  3. Install the desktop software.
  4. Load a model in the graphical interface.
  5. Choose a solver or integrator and inspect the solution process.

Verdict

ASCEND provides modeling, solving, unit handling, and thermodynamics capabilities in a free desktop package. Its equation-focused purpose and identified current version are worth considering before adopting it.

Questions

How much does ASCEND cost?

The ASCEND plan is free. It is described as free, open-source software.

Is there a free trial?

No. ASCEND has no free trial; its pricing model is free.

Which platforms does ASCEND support?

ASCEND is available for Linux, macOS, and Windows as desktop software.

What can ASCEND solve?

It can solve nonlinear equations, linear and nonlinear optimization problems, and dynamic systems expressed as differential/algebraic equations.

Is ASCEND open source?

Yes. ASCEND is released under the General Public License.

Who makes ASCEND?

The maker is ASCEND, founded in 1978.

Facts from ASCEND's own pages

Authoring tools
Yes · ascend4.org, 21 Sept 2026
Automation
ASCEND exposes its interface through C, C++, and Python, and users can automate model loading and solving with Python scripts. · ascend4.org, 11 Oct 2026
Current release
The homepage identifies version 0.9.8 as the current version. · ascend4.org, 11 Oct 2026
Data export
Yes · ascend4.org, 21 Sept 2026
Delivery mode
desktop · ascend4.org, 21 Sept 2026
Extensions
External libraries can add solvers, integrators, methods, relations, and import handlers; external methods can also be written in Python. · ascend4.org, 11 Oct 2026
Founded
1978 · ascend4.org, 28 Sept 2026
Free plan
Yes · ascend4.org, 21 Sept 2026
GUI
The GUI lets users load models, choose a solver or integrator, and inspect how the model is solved. · ascend4.org, 11 Oct 2026
License
ASCEND is released under the General Public License. · ascend4.org, 11 Oct 2026
Modeling
It lets users build complex models from simpler submodels using a special-purpose modeling language. · ascend4.org, 11 Oct 2026
Platforms
The site lists downloads for Windows, Linux, and Mac; it says macOS installation may require building from source. · ascend4.org, 11 Oct 2026
Problem types
It can solve nonlinear equations, linear and nonlinear optimization problems, and dynamic systems expressed as differential/algebraic equations. · ascend4.org, 11 Oct 2026
Purpose
ASCEND solves systems of equations and is aimed at engineers and scientists. · ascend4.org, 11 Oct 2026
Support
The site invites users to report bugs, contact the team, and contribute models and other work. · ascend4.org, 11 Oct 2026
Thermodynamics
It includes thermodynamics capabilities for distillation and flash problems and integrates IAPWS-IF97 steam tables. · ascend4.org, 11 Oct 2026
Units
ASCEND handles units of measurement and converts between units such as inches, feet, centimeters, meters, and kilometers. · ascend4.org, 11 Oct 2026

Where ASCEND stands on Freedom251

Look at these too