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Amass vs Shodan: catalog facts
Amass	Shodan
Free The software is free under its open-source licence. Hosting, hardware and external…	Freemium Free searches with a paid membership and API tiers for wider access.
Windows, macOS, Linux, Command line	Web, Browser extension
It combines passive open-source intelligence with active reconnaissance and stores the results in a graph database you…	Searchable index of exposed devices and services worldwide Monitor feature alerts on changes to your own IP ranges
Active reconnaissance touches the target directly, so it must only be pointed at systems you are authorised to…	Most useful features require a paid membership Account required for meaningful searches
Downloadable app	Hosted service, Browser extension
Open source	Closed source
License: Apache-2.0	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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