Ansys optiSLang vs OpenLSTO

Ansys optiSLang automates simulation workflows and connects them to optimization methods for parametric design studies. It coordinates processes between heterogeneous CAx tools across an enterprise. Its capabilities include design optimization, robustness and reliability analysis, reduced-order modeling, model calibration, design of experiments and sensitivity analysis. The open ecosystem connects with more than 100 third-party CAE/CAD applications and in-house solutions through Ansys nodes, scripting, text interfaces or custom integrations. It integrates with Ansys Minerva for workflow publishing and simulation process and data management. The optiSLang AI+ add-on provides machine-learning methods for sensitivity analysis, optimization and robust design. Windows and Linux installations are supported, alongside web and self-hosted platforms. The 2026 R1 release expands Python controls and support for cloud and HPC deployment workflows, and adds or enhances connections for Rocky, FreeFlow, LS-OPT and Ansys SimAI. Pricing is available on request and a 30-day trial is listed. An enterprise license is required to build apps and conduct a much higher number of concurrent variations.

OpenLSTO is open-source C++ software for structural topology optimization using a level set method. It seeks to minimize compliance, or maximize stiffness, within a volume constraint in a two-dimensional design domain. Developed and maintained by researchers at UC San Diego and Cardiff University, the described first light version is limited to that 2D problem. It runs through command-line arguments in a terminal; simple serial cases without external libraries can be compiled and executed with a C++ compiler. OpenLSTO produces.vtk solution files that ParaView can read, so users need a data visualization tool for post-processing. The project favors in-house components where possible and is available under the Apache 2.0 license. It runs on Linux, macOS, and Windows, with repository-clone and ZIP download options. The software is free: the OpenLSTO plan is free. The project says expanded capabilities using externally provided software are planned for a more advanced version.