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

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