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FSMonitor vs ProcessActivityView: catalog facts
FSMonitor	ProcessActivityView
Paid Paid app with a free 14-day trial.	Free Freeware from NirSoft, free to use and redistribute unmodified.
macOS, Command line	Windows
Captures creations, deletions, renames and attribute changes Filtering by path, event type or process	Per-file counts of opens, reads, writes and bytes Shows which DLL opened each file
macOS only Paid after the trial	The published requirements list versions through Windows 8 Injects a DLL into the inspected process
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License: Freeware
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 8, 2026

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