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CertGraphCensys
Free

Free and open source under the GPL-2.0-or-later license.

 Freemium

Free basic search with paid plans for the full platform.

Windows, macOS, Linux, Web, Command line Web
  • Builds a graph from certificate alternative names
  • Supports HTTPS and SMTP certificate collection
  • Searchable map of hosts, services and TLS certificates
  • Attack surface and adversary investigation tooling
  • The Censys driver requires API keys.
  • Full platform is enterprise-focused with paid plans
  • Account required to use search
Downloadable app, 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

Checked October 8, 2026

Checked September 23, 2026

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