Prime95

Automated

Free Mersenne prime search and CPU stress-testing software distributed as part of GIMPS.

Visit website Pricing page

Active plans

Total changes

Last change

Jul 18, 2026

Price trend

no history

What we know about Prime95’s pricing

Stable

Changes in 12 months

Cadence

Only change tracked, 2mo ago

Direction

New plan recently added

Category position

—

Not enough peers tracked yet

Current pricing

Free

monthly

Free

CPU stress testing
Mersenne prime search participation
Cross-platform: Windows, Mac OS X, Linux, FreeBSD
Free GIMPS software license
Regular version updates

Price history

Last 1 changes

Date	Plan	Change	Old	New	Δ%
Jul 18, 2026	Free	new plan	—	$0	—

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