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GtkStressTesting vs FurMark: catalog facts
GtkStressTesting	FurMark
Free Free and open source under the GPLv3.	Free Free to use; proprietary software from Geeks3D.
Linux	Windows, Linux, Command line
Stress testing and monitoring in one graphical tool Includes benchmarking	Very intensive GPU load for stability testing OpenGL and Vulkan benchmarks with online scores
Linux only Stress tests put heavy load on hardware and should be watched	Closed source Extreme load can push poorly cooled hardware to its limits
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License: Proprietary
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.