OpenLSTO

OpenLSTO is open-source C++ software for level set based structural topology optimization. It best suits researchers and technically comfortable users working on 2D designs; its focused compliance objective comes with a terminal-based workflow and separate post-processing.

Overview

OpenLSTO implements the M2DO lab’s method to minimize compliance—equivalently, to maximize stiffness—subject to a volume constraint. That narrow scope makes it a purposeful option for this particular optimization problem, not a general-purpose design environment. The project is maintained by researchers at UC San Diego and Cardiff University and is released under the Apache 2.0 license.

Key features

• 2D compliance optimization: The first light version addresses 2D design domains and a volume constraint. It is a fit for that defined problem, but not for users who need a broader range of objectives or design dimensions.
• C++ implementation: Simple serial cases can be compiled and run with a C++ compiler alone, avoiding external libraries for that workflow. The project favors in-house components where possible; more advanced capabilities using external software are planned.
• Terminal execution: Runs through command-line arguments, which suits scripting-oriented work but offers no graphical workflow in the described version.
• Solution visualization: OpenLSTO can output .vtk files for ParaView. Users therefore need a separate visualization tool to inspect and post-process results.

Pricing

OpenLSTO costs free. The free, open-source plan provides the first light version for 2D compliance minimization under a volume constraint. There is no separate free trial; users can obtain the project by cloning its repository or downloading a ZIP file. Its main trade-off is scope: the described version focuses on that one 2D optimization setup.

Platforms

OpenLSTO supports Linux, macOS, and Windows. Its command-line interface and C++ compilation requirement make platform support most useful to people comfortable building and running software in a terminal.

Who it's for

OpenLSTO is best for researchers, students, and engineering users who need level set topology optimization for a 2D compliance problem and can work with command-line tools. It is less suitable for users who expect an integrated graphical interface, built-in visualization, or optimization beyond the stated objective and constraint.

Pros and cons

• Pro — Free and open source: The Apache 2.0 license makes the software available without a paid plan.
• Pro — Lean serial setup: Simple cases can compile with only a C++ compiler, reducing reliance on third-party dependencies.
• Con — Narrow first-version scope: The described release addresses 2D compliance minimization under a volume constraint, limiting its use for other optimization problems.
• Con — Separate result inspection: Users must post-process output with a visualization tool such as ParaView.
• Con — Terminal-only execution: Command-line arguments may be a poor fit for users seeking a graphical design workflow.

Alternatives

For a broader directory of options, browse Generative Design Software.

• TopOpt is another free option if its MATLAB code for minimum compliance and buckling optimization, including MATLAB and COM offerings, better matches your workflow.
• Avocado is a free alternative for users seeking an early-development project that requires a PlayStation BIOS; game compatibility varies.
• Dakota is worth considering if you want free open-source software under the GNU LGPL rather than a tool focused on OpenLSTO’s stated 2D method.
• ICEM Surf may suit Windows users who want a learning edition for personal use; its commercial licenses are a separate option.
• nTop offers a free non-commercial Education license for students, educators, and academic researchers, with commercial licensing as a separate route.
• OpenMDAO is a free Apache 2.0 framework for users seeking a framework rather than OpenLSTO’s specific topology-optimization implementation.
• Plato offers a free open-source version with a limited set of objectives and constraints, or a licensed version for eligible U.S. government agencies and contractors.
• Z88Arion is a free Windows-only option with German-language support; commercial use requires a separate license.

Verdict

Choose OpenLSTO if you need a free, open-source implementation of level set topology optimization for 2D compliance minimization and are comfortable compiling and running C++ software from a terminal. Its focused method and light serial setup are the reasons to choose it; look elsewhere if you need a graphical workflow, integrated visualization, or a wider optimization scope.