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fnmap vs Zenmap: catalog facts
fnmap	Zenmap
Free Free and open source under the GPL-2.0 or later licence.	Free Free, usually distributed together with Nmap.
Linux	Windows, macOS, Linux
Graphical interface for nmap scans Quick Scan option for common scans	Saved scan profiles for repeat scans Interactive command creator for Nmap options
Intended for authorized testing of networks you own or may scan Little recent activity visible on the developer site	Depends on Nmap, which must also be installed Intended for authorized testing of networks you own or may scan
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0-or-later	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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