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Responder vs NetExec: catalog facts
Responder	NetExec
Free The software is free under its open-source licence. Hosting, hardware and external…	Free The open-source software is available without a license fee. Hosting, hardware and…
Linux, Command line	Windows, macOS, Linux, Command line
It answers failed name lookups and runs rogue authentication servers for many protocols, which demonstrates the risk of…	Groups service checks and authentication testing in a command-line toolkit.
It captures real credentials from real users, so it is only ever appropriate inside an authorised engagement.	Requires careful credential handling and permission to test the environment.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: BSD-2-Clause
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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