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FurMark vs GtkStressTesting: catalog facts
FurMark	GtkStressTesting
Free Free to use; proprietary software from Geeks3D.	Free Free and open source under the GPLv3.
Windows, Linux, Command line	Linux
Very intensive GPU load for stability testing OpenGL and Vulkan benchmarks with online scores	Stress testing and monitoring in one graphical tool Includes benchmarking
Closed source Extreme load can push poorly cooled hardware to its limits	Linux only Stress tests put heavy load on hardware and should be watched
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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