occt

OCCT is an acronym that may refer to more than one software project. The two most common uses are Open CASCADE Technology and OverClock Checking Tool.

Open CASCADE Technology (OCCT) is an open-source software development platform used to build applications for computer-aided design, manufacturing, and engineering (CAD/CAM/CAE). It provides a comprehensive kernel for 3D surface and solid modeling, topology, visualization, data exchange, and meshing. The platform includes components for geometry processing, data interoperability with formats such as STEP and IGES, and rendering facilities. OCCT is written in C++ and is designed to be cross-platform, running on Windows, Linux, and macOS. It is widely employed by developers to implement geometry kernels, CAD tools, and visualization pipelines, and it serves as the foundation for both commercial and research projects.

OverClock Checking Tool (OCCT) is a Windows-based diagnostic and stress-testing utility used to evaluate hardware stability and cooling performance. It provides targeted tests for CPU, GPU, and memory, along with real-time monitoring of system sensors such as temperatures, voltages, power draw, and fan speeds. Users can configure test duration, intensity, and workload, and the tool generates logs and reports that help assess stability under load and validate overclock settings. OCCT is commonly used by hardware enthusiasts, system integrators, and IT professionals to verify stability and thermal behavior during benchmarking and overclocking.

In common usage, OCCT can refer to either project depending on the context. The two aims—open-source CAD technology and hardware stress testing—belong to distinct domains and are not related in functionality.