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SecurityTrails vs CertGraph: catalog facts
SecurityTrails	CertGraph
Freemium An API key is available on sign-up; larger data services are aimed at security teams.	Free Free and open source under the GPL-2.0-or-later license.
Web	Windows, macOS, Linux, Web, Command line
Historical DNS and WHOIS records going back years Subdomain and associated domain discovery	Builds a graph from certificate alternative names Supports HTTPS and SMTP certificate collection
Requires an account to use Oriented towards business security teams rather than casual users	The Censys driver requires API keys.
Web application, Hosted service	Downloadable app, Web application
Closed source	Open source
License not stated	License: GPL-2.0-or-later
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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