What is the difference between censys-subdomain-finder vs crt.sh?

**censys-subdomain-finder**: A tool for performing subdomain enumeration using Censys API.. **crt.sh**: Bash script for subdomain enumeration via crt.sh certificate transparency logs. Core capabilities include Subdomain enumeration via certificate transparency logs, Automated querying of crt.sh website, Parsing and filtering of crt.sh output.. Both serve the External Attack Surface Management market but differ in approach, feature depth, and target audience.

Is censys-subdomain-finder a good alternative to crt.sh?

censys-subdomain-finder and crt.sh serve similar External Attack Surface Management use cases: both are External Attack Surface Management tools, both cover Subdomain Enumeration. Key differences: censys-subdomain-finder is open-source. Review the feature comparison above to determine which fits your requirements.

censys-subdomain-finder vs crt.sh: Features, Integrations, Reviews (2026) | CybersecTools

censys-subdomain-finder vs crt.sh: Side-by-Side Comparison (2026)

Features, pricing, ratings, and pros & cons — compared head-to-head.

censys-subdomain-finder is a free external attack surface management tool. crt.sh is a free external attack surface management tool. Compare features, ratings, integrations, and community reviews side by side to find the best external attack surface management fit for your security stack.

CST Verdict

Based on our analysis of NIST CSF 2.0 coverage, core features, integrations, company size fit, here is our conclusion:

crt.sh

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 May 2026