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OCCT vs FurMark: catalog facts
OCCT	FurMark
Freemium Free for individuals, with offerings for professional and business use.	Free Free to use; proprietary software from Geeks3D.
Windows, Linux	Windows, Linux, Command line
Stress testing, benchmarking and monitoring in one tool Free for individual users	Very intensive GPU load for stability testing OpenGL and Vulkan benchmarks with online scores
Closed source Professional use is a separate offering	Closed source Extreme load can push poorly cooled hardware to its limits
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License: Proprietary
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.