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Nuclei vs ZAP: catalog facts
Nuclei	ZAP
Freemium The Nuclei command-line scanner and its templates are free and open source under the MIT…	Free Free and open source under the Apache licence.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Browser extension
Checks are readable YAML templates, so you can review and write them yourself Community templates cover trending vulnerabilities within days	Intercepting proxy plus automated scanning in one free tool API and automation framework make it usable inside CI pipelines
Only legitimate against systems you are authorised to scan Coverage depends on the template library; an untemplated vulnerability is invisible	Active scanning can damage a live application and must only be run with permission Java application with a heavy interface
Downloadable app	Downloadable app, Browser extension
Open source	Open source
License: MIT	License: Apache-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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