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Process Explorer vs System Informer: catalog facts
Process Explorer	System Informer
Free Free to download and use, published by Microsoft as part of the Sysinternals suite. The…	Free Free and open source under the MIT licence.
Windows	Windows
Finds which process has a particular file or directory open Process tree shows parent and child relationships, not just a flat list	Open source under the MIT licence, unlike the Sysinternals equivalents Detailed stack traces with kernel-mode, WOW64 and .NET support
Windows only Closed source, though published by Microsoft	Windows 10 or later only Its kernel driver is sometimes flagged by security software
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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