Top picks: Amass, censys-enumeration, assetfinder — plus 45 more compared.
Attack SurfaceEvaluating crt.sh alternatives comes down to matching Attack Surface capabilities to your environment, integrations, and budget rather than chasing feature parity. The options below are compared on what actually drives a switch: coverage, deployment fit, pricing, and real reviews from security teams. Independent and vendor-neutral: we never sell rankings.
crt.sh is a free External Attack Surface Management tool. Security professionals most commonly compare it with Amass, censys-enumeration, assetfinder, ScanCannon, and Threat Surface - Attack Surface Management. All 48 alternatives are matched by shared capabilities, tags, and NIST CSF 2.0 coverage.
A closer look at the 8 most relevant alternatives and competitors to crt.sh, including their key features and shared capabilities.
Amass is an open-source OWASP tool for comprehensive attack surface mapping and asset discovery through domain reconnaissance and subdomain enumeration.
Shares 5 capabilities with crt.sh: Reconnaissance, Open Source, Network Reconnaissance, DNS Security +1 more
A script to extract subdomains/emails for a given domain using SSL/TLS certificate dataset on Censys.
Shares 4 capabilities with crt.sh: Enumeration, SSL, Reconnaissance, Subdomain Enumeration
A command-line tool for discovering domains and subdomains related to a target domain during reconnaissance activities.
Shares 4 capabilities with crt.sh: Enumeration, Reconnaissance, Network Reconnaissance, Subdomain Enumeration
A Python-based tool for external attack surface discovery and reconnaissance across large-scale networks, focusing on IP address and subdomain enumeration.
Shares 4 capabilities with crt.sh: Enumeration, Reconnaissance, DNS Security, Subdomain Enumeration
EASM platform for continuous discovery and risk assessment of external assets.
Shares 3 capabilities with crt.sh: Reconnaissance, Security Scanning, Subdomain Enumeration
Domain exposure monitoring tool for leaked creds, subdomains & dark web data.
Shares 3 capabilities with crt.sh: Enumeration, Reconnaissance, Subdomain Enumeration
AI-powered EASM platform for digital asset discovery and monitoring.
Shares 3 capabilities with crt.sh: Reconnaissance, Security Scanning, Subdomain Enumeration
ASM platform monitoring external attack surface, dark web leaks & 3rd-party risks.
Shares 3 capabilities with crt.sh: SSL, DNS Security, Subdomain Enumeration
Amass is an open-source OWASP tool for comprehensive attack surface mapping and asset discovery through domain reconnaissance and subdomain enumeration.
A script to extract subdomains/emails for a given domain using SSL/TLS certificate dataset on Censys.
A command-line tool for discovering domains and subdomains related to a target domain during reconnaissance activities.
A Python-based tool for external attack surface discovery and reconnaissance across large-scale networks, focusing on IP address and subdomain enumeration.
EASM platform for continuous discovery and risk assessment of external assets.
Domain exposure monitoring tool for leaked creds, subdomains & dark web data.
AI-powered EASM platform for digital asset discovery and monitoring.
ASM platform monitoring external attack surface, dark web leaks & 3rd-party risks.
FestIn discovers open S3 buckets associated with a domain using crawling and DNS reconnaissance techniques.
A domain reconnaissance tool that automates subdomain discovery, port scanning, and monitoring with support for multiple data sources and notification integrations.
SOCRadar Attack Surface Management is an EASM platform that continuously discovers, monitors, and assesses internet-facing digital assets for vulnerabilities and security risks.
Platform for external attack surface management and application security testing
Monitors internet-facing subdomains for vulnerabilities and misconfigurations
External attack surface monitoring with dark web intelligence and scanning
Maps external attack surface including assets, dark web exposure, and leaks.
Passive pre-sale domain diagnostic tool for vCISOs, MSPs & MSSPs.
External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports.
Agentless EASM platform for asset discovery, exposure mgmt & risk reduction.
Curated Google dork search tool for OSINT and web reconnaissance.
Cloud_enum is a multi-cloud OSINT tool that enumerates publicly accessible resources across AWS, Azure, and Google Cloud platforms for security assessment purposes.
Sublist3r is a python tool for enumerating subdomains using OSINT and various search engines.
Python utility for testing the existence of domain names under different TLDs to find malicious subdomains.
A full-featured reconnaissance framework for web-based reconnaissance with a modular design.
A multi-cloud DNS security tool that detects dangling DNS records and potential subdomain takeover vulnerabilities by scanning cloud infrastructure and DNS zones.
A black-box reconnaissance tool that discovers cloud infrastructure, files, and applications across major cloud providers for security testing purposes.
A powerful enumeration tool for discovering assets and subdomains.
A high-performance DNS stub resolver for bulk lookups and reconnaissance (subdomain enumeration)
A subdomain enumeration tool for bug hunting and pentesting
An automation framework that runs multiple open-source subdomain bruteforcing tools in parallel using Docker Compose and custom wordlists.
A subdomain scan tool that helps you find subdomains of a given domain.
CloudScraper is an enumeration tool that discovers cloud storage resources including S3 buckets, Azure blobs, and DigitalOcean Spaces across target environments.
A Chrome extension that automatically detects and lists Amazon S3 buckets while browsing websites.
A tool for enumerating and analyzing Amazon S3 buckets associated with specific targets to identify potential security misconfigurations.
A tool to identify potential subdomain takeovers by checking if a CNAME record resolves to the scope address.
A tool for taking a list of resolved subdomains and outputting any corresponding CNAMES en masse.
ASM platform that scans external attack surfaces hourly for vulnerabilities
External attack surface management platform with continuous asset discovery
Internet intelligence platform for asset discovery and attack surface mapping
Automated ASM tool for multi-cloud environments with continuous asset discovery
Active attack surface mgmt solution for discovering & remediating unknown risks
DNS security posture management across multicloud and on-prem environments
Attack surface management platform with dark web & brand monitoring capabilities
Discovers and inventories internet-facing assets including subdomains, IPs, and apps.
Customizable ASM platform for asset discovery, monitoring, and enrichment
Internet-connected asset search engine with vulnerability scanning capabilities
Attack surface management platform for discovering and securing exposed assets
Automated digital asset discovery and monitoring for external attack surface
External attack surface management platform for asset discovery and monitoring
Common questions security professionals ask when evaluating alternatives and competitors to crt.sh.
The most popular alternatives to crt.sh include Amass, censys-enumeration, assetfinder, ScanCannon, and Threat Surface - Attack Surface Management. These External Attack Surface Management tools offer similar capabilities and are frequently compared by security professionals evaluating their options.
There are 48 alternatives to crt.sh listed on CybersecTools, all within the External Attack Surface Management category. Each alternative is matched based on shared capabilities, tags, and NIST CSF coverage areas.
crt.sh is a free External Attack Surface Management tool. You can use it at no cost. Both free and commercial alternatives are available for comparison.
crt.sh is a External Attack Surface Management tool within the broader Attack Surface category. It is used by security professionals for external attack surface management capabilities and can be compared against 48 similar tools.
