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ProcessSpy vs Mac Performance Monitor: catalog facts
ProcessSpy	Mac Performance Monitor
Free Offered as a direct download from the developer's site.	Free Free and open source.
macOS	macOS
Per-process CPU and memory history Recall of processes that have already exited	Recorded history to find when a slowdown began Compare process traces on one timeline
macOS only, and requires macOS 14 or later	Apple silicon only Requires macOS 15 or later
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
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.