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FSMonitor vs FileActivityWatch: catalog facts
FSMonitor	FileActivityWatch
Paid Paid app with a free 14-day trial.	Free Freeware from NirSoft with no paid tier.
macOS, Command line	Windows
Captures creations, deletions, renames and attribute changes Filtering by path, event type or process	Links each file operation to the process that made it Folder and drive summary modes
macOS only Paid after the trial	Requires running as Administrator Windows only
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.