crt.sh vs SurfaceDiff: 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. SurfaceDiff is a commercial external attack surface management tool by SurfaceDiff. 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 VerdictBased on our analysis of core features, integrations, company size fit, deployment model, here is our conclusion:
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.
Data verified Sep 2026
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