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Prime95 vs GtkStressTesting: catalog facts
Prime95	GtkStressTesting
Free Free to download and use under the GIMPS free software license.	Free Free and open source under the GPLv3.
Windows, macOS, Linux	Linux
Standard, demanding CPU and memory stress test Builds for Windows, macOS, Linux and FreeBSD	Stress testing and monitoring in one graphical tool Includes benchmarking
Not an OSI open source license Dated interface	Linux only Stress tests put heavy load on hardware and should be watched
Downloadable app	Downloadable app
Closed source	Open source
License: GIMPS free software license	License: GPL-3.0-or-later
Not stated if an account is 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.