Ansys optiSLang vs FreeTO

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.

FreeTO is free, open-source MATLAB software for initializing, optimizing, and post-processing free-form 3D topology optimization problems. It accepts STL files for a design domain and load-carrying subdomains, together with mesh controls and a target volume fraction. A structured hexahedral mesh is used, and optimized structures have smooth boundaries. Inputs can define supports, force magnitudes, up to nine additional load cases, and regions that must remain unchanged. SIMP is the documented default optimization method, and SEMDOT is also supported. Topologies can be mirrored across up to three specified symmetry planes. Results include compliance, volume fraction, density arrays, element counts, optimization histories, visual topology displays, and an optional STL file. Sample problems cover a GE bracket, airplane bracket, human hand model, and quadcopter. The repository uses an MIT license and other open-source codes. Its available optimizer is optimality criteria; the MMA implementation is commented out, with code available by email request.