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

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