crt.sh vs Device Authority DDKG: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros and cons, compared head to head.
crt.sh is a free external attack surface management tool. Device Authority DDKG is a commercial non-human identity tool by Device Authority. Compare features, ratings, integrations, and community reviews side by side to find the best external attack surface management fit for your security stack. Independent and vendor-neutral: our scores and rankings are earned, never bought — sponsored placement is always labeled.
CST VerdictShort answer
Security teams doing threat intelligence or domain monitoring should use crt.sh as a free, fast way to spot certificate issuance anomalies that signal domain takeover or phishing campaigns before they scale. Certificate Transparency logs index roughly 15 billion certificates, giving you real-time visibility into what's been legitimately issued against your domains and competitors' infrastructure. Skip this if you need automated alerting or integration into your SIEM; crt.sh is a lookup tool, not a monitoring platform, and catching malicious certificates requires manual checks or custom scripting. Mid-market and enterprise teams managing heterogeneous device fleets with legacy hardware will find real value in Device Authority DDKG because it anchors device trust to immutable hardware attributes rather than certificates that rot or get mismanaged. The patented dynamic key generation approach eliminates the PKI sprawl most organizations struggle with, and NIST PR.AA coverage confirms the authentication foundation is solid. Skip this if your devices are short-lived cloud instances or you're standardized on traditional certificate infrastructure; DDKG's strength is brownfield IoT and industrial environments where you can't simply replace hardware or mandate certificate rotation.
