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Nmap vs fnmap: catalog facts
Nmap	fnmap
Free Free for end users under the Nmap Public Source License. Redistributing Nmap inside a…	Free Free and open source under the GPL-2.0 or later licence.
Windows, macOS, Linux, Command line	Linux
Host discovery, port scanning, service and version detection and OS fingerprinting in one tool The Nmap Scripting Engine adds hundreds of Lua scripts for specific checks	Graphical interface for nmap scans Quick Scan option for common scans
The licence is custom, not OSI-approved, and is incompatible with GPLv2 Companies redistributing Nmap in their own products need a commercial OEM licence	Intended for authorized testing of networks you own or may scan Little recent activity visible on the developer site
Downloadable app	Downloadable app
Not stated if open source	Open source
License: Nmap Public Source License	License: GPL-2.0-or-later
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 1, 2026

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