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stress-ng vs Prime95: catalog facts
stress-ng	Prime95
Free Free and open source.	Free Free to download and use under the GIMPS free software license.
Linux, Command line	Windows, macOS, Linux
Stresses CPU, memory, I/O and kernel interfaces Stressors can be run individually or combined	Standard, demanding CPU and memory stress test Builds for Windows, macOS, Linux and FreeBSD
Command line only Can make a system unresponsive if used carelessly	Not an OSI open source license Dated interface
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License: GIMPS free software license
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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