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Prime95 vs stress-ng: catalog facts
Prime95	stress-ng
Free Free to download and use under the GIMPS free software license.	Free Free and open source.
Windows, macOS, Linux	Linux, Command line
Standard, demanding CPU and memory stress test Builds for Windows, macOS, Linux and FreeBSD	Stresses CPU, memory, I/O and kernel interfaces Stressors can be run individually or combined
Not an OSI open source license Dated interface	Command line only Can make a system unresponsive if used carelessly
Downloadable app	Downloadable app
Closed source	Open source
License: GIMPS free software license	License: GPL-2.0
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 2, 2026

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