The product
Bash script for subdomain enumeration via crt.sh certificate transparency logs.
The closest crt.sh alternatives are ctlogs.dev, MGM Security Partners recon me and DDactic Attack Surface Discovery. Picking a crt.sh alternative comes down to fit: External Attack Surface Management coverage, your environment, your integrations and your budget. So each option below shows what it covers, how it deploys, its pricing model and the company behind it.
45 alternativesClosest matches: ctlogs.dev, MGM Security Partners recon me, DDactic Attack Surface DiscoveryPage updated Nov 2026
The product
Bash script for subdomain enumeration via crt.sh certificate transparency logs.
crt.sh is a free External Attack Surface Management solution. The closest matches by shared tags and NIST CSF 2.0 coverage are ctlogs.dev, MGM Security Partners recon me, DDactic Attack Surface Discovery, SurfaceDiff, and Attack Surface Scan. All 45 alternatives on this page are ranked the same way.
These 8 solutions overlap most with crt.sh. Each row says what the product does and, when the overlap is big enough, which capabilities it shares.
Fast Certificate Transparency search and JSON API for subdomain reconnaissance.
Key features: Real-time Certificate Transparency Search, Automated Subdomain Enumeration, High-Performance REST JSON API, Wildcard & Fingerprint Matching, SSL/TLS Certificate History Tracking
Shares 4 capabilities with crt.sh: SSL, Reconnaissance, DNS Security, Subdomain Enumeration
recon me is an OSINT tool developed by mgm Security Partners and used as part of the company's OSINT analysis service. The tool collects and correlates publicly available information about an organization's external attack surface, including domains, subdomains, servers, technologies used, metadata, and publicly accessible files. It supports two scan modes: - Passive scan: queries public directory services such as Whois, DNS, and MX records to identify servers, subdomains, email addresses, technologies, and operators (e.g. Amazon, Akamai) without any interaction with target systems. - Active scan: directly examines the target domain without performing attacks, to identify additional services, technologies, or unintentionally exposed files. Results from recon me are combined with manual expert analysis and used to produce a report detailing identified assets, potential vulnerabilities, misconfigurations, and prioritized recommendations. The output is intended to give organizations a view of their public attack surface from an attacker's perspective and can serve as a basis for further security testing such as penetration tests.</description> <parameter name="summary">Proprietary OSINT tool for mapping an organization's public attack surface
Key features: 8 listed. See them on the MGM Security Partners recon me page.
Shares 5 capabilities with crt.sh: Reconnaissance, Security Scanning, Network Reconnaissance, DNS Security +1 more
View MGM Security Partners recon meMGM Security Partners recon me alternativescrt.sh vs MGM Security Partners recon me
Scans domains to discover attack surface, vulnerabilities, and generate hardening
Key features: 10 listed. See them on the DDactic Attack Surface Discovery page.
Shares 5 capabilities with crt.sh: SSL, Reconnaissance, Security Scanning, DNS Security +1 more
View DDactic Attack Surface DiscoveryDDactic Attack Surface Discovery alternativescrt.sh vs DDactic Attack Surface Discovery
Continuous external attack surface monitoring that shows what changed between scans.
Key features: 9 listed. See them on the SurfaceDiff page.
Shares 4 capabilities with crt.sh: Reconnaissance, Security Scanning, DNS Security, Subdomain Enumeration
View SurfaceDiffSurfaceDiff alternativescrt.sh vs SurfaceDiff
Agentless external attack surface monitoring with continuous change detection.
Key features: 10 listed. See them on the Attack Surface Scan page.
Shares 4 capabilities with crt.sh: SSL, Security Scanning, DNS Security, Subdomain Enumeration
View Attack Surface ScanAttack Surface Scan alternativescrt.sh vs Attack Surface Scan
AI-powered EASM platform for digital asset discovery and monitoring.
Key features: 5 listed. See them on the Cylana EASM page.
Shares 3 capabilities with crt.sh: Reconnaissance, Security Scanning, Subdomain Enumeration
View Cylana EASMCylana EASM alternativescrt.sh vs Cylana EASM
AI-enhanced EASM platform for external attack surface discovery and monitoring.
Key features: 10 listed. See them on the TRaViS page.
Shares 3 capabilities with crt.sh: Reconnaissance, Security Scanning, Subdomain Enumeration
ASM platform monitoring external attack surface, dark web leaks & 3rd-party risks.
Key features: 10 listed. See them on the ThreatDefence Integrated ASM page.
Shares 3 capabilities with crt.sh: SSL, DNS Security, Subdomain Enumeration
View ThreatDefence Integrated ASMThreatDefence Integrated ASM alternativescrt.sh vs ThreatDefence Integrated ASM
Fast Certificate Transparency search and JSON API for subdomain reconnaissance.
Scans domains to discover attack surface, vulnerabilities, and generate hardening
Continuous external attack surface monitoring that shows what changed between scans.
Agentless external attack surface monitoring with continuous change detection.
AI-powered EASM platform for digital asset discovery and monitoring.
AI-enhanced EASM platform for external attack surface discovery and monitoring.
ASM platform monitoring external attack surface, dark web leaks & 3rd-party risks.
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
Maps external attack surface including assets, dark web exposure, and leaks.
Agentless EASM platform for asset discovery, exposure mgmt & risk reduction.
Sn1per Professional 2026: automated penetration testing & attack surface management
External attack surface monitoring with dark web intelligence and scanning
Passive pre-sale domain diagnostic tool for vCISOs, MSPs & MSSPs.
External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports.
External attack surface management built on the DNS you already control.
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
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
EASM platform that discovers, attributes, and actively validates external assets and risks
ASM platform that scans external attack surfaces hourly for vulnerabilities
Automated digital asset discovery and monitoring for external attack surface
External attack surface management platform for asset discovery and monitoring
External attack surface mapping service to discover exposed digital assets
OSINT tool for mapping & monitoring risk ecosystems on Clear & Deep Web.
Continuous external asset discovery and monitoring with daily domain scans.
ASM platform for continuous discovery and risk validation of internet-exposed assets.
DNS posture mgmt platform for real-time DNS & WHOIS change monitoring.
Agentless external attack surface & dark web monitoring platform.
Continuous, agentless discovery and threat-intel enrichment of external internet-facing
Internet-wide scanning platform for discovering exposed devices, services
External attack surface scanning for MSPs to identify vulnerabilities
Independent security scoring and attestation for third-party managed web apps
Cloud platform for continuous visibility & mgmt of external attack surfaces
AI-powered attack surface management platform for cybersecurity monitoring
Common questions when weighing alternatives to crt.sh.
The closest matches to crt.sh by shared tags and NIST CSF 2.0 coverage are ctlogs.dev, MGM Security Partners recon me, DDactic Attack Surface Discovery, SurfaceDiff, and Attack Surface Scan. All of them are External Attack Surface Management products.
This page shows 45 alternatives to crt.sh, all in the External Attack Surface Management category. Each one is matched on shared tags and NIST CSF 2.0 areas, and the closest matches rank first.
crt.sh is a free External Attack Surface Management product. You can use it at no cost. Only commercial alternatives are listed here. Free and open source products are under /free.
crt.sh is a External Attack Surface Management product in the Exposure & Vulnerability Management category. You can compare it with the 45 other External Attack Surface Management products on this page.
Need the answer fast? Best Attack Surface Management Solutions for Business picks Palo Alto Networks Cortex Xpanse, Microsoft Defender EASM, Mandiant Attack Surface Management and 4 more.See the shortlist
