Compare software

CertGraph vs SecurityTrails: catalog facts
CertGraph	SecurityTrails
Free Free and open source under the GPL-2.0-or-later license.	Freemium An API key is available on sign-up; larger data services are aimed at security teams.
Windows, macOS, Linux, Web, Command line	Web
Builds a graph from certificate alternative names Supports HTTPS and SMTP certificate collection	Historical DNS and WHOIS records going back years Subdomain and associated domain discovery
The Censys driver requires API keys.	Requires an account to use Oriented towards business security teams rather than casual users
Downloadable app, Web application	Web application, Hosted service
Open source	Closed source
License: GPL-2.0-or-later	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 October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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