# crt.sh vs DDactic Attack Surface Discovery: side-by-side comparison (2026) [crt.sh](https://cybersectools.com/tools/crt-sh) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. [DDactic Attack Surface Discovery](https://cybersectools.com/tools/ddactic-attack-surface-discovery) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [DDactic](https://cybersectools.com/companies/ddactic). Features, integrations, deployment and the company behind each one, side by side. Need the answer fast? [Best Attack Surface Management Solutions for Business](https://cybersectools.com/shortlists/best-attack-surface-solutions) picks Palo Alto Networks Cortex Xpanse, Microsoft Defender EASM, Mandiant Attack Surface Management and 4 more. ## Side-by-side comparison | | crt.sh | DDactic Attack Surface Discovery | |---|---|---| | Pricing model | Free | Commercial | | Category | External Attack Surface Management | External Attack Surface Management | | Verified | No | No | | Deployment type | On-Premises | Cloud | | Company size fit | Startup, SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise | | Company | – | DDactic | | Headquarters | – | – | ### Use cases and capabilities | | crt.sh | DDactic Attack Surface Discovery | |---|---|---| | Subdomain Enumeration | Yes | Yes | | Reconnaissance | Yes | Yes | | Open Source | Yes | – | | Bug Bounty | Yes | – | | Enumeration | Yes | – | | Network Reconnaissance | Yes | – | | SSL | Yes | Yes | | DNS Security | Yes | Yes | | Security Scanning | Yes | Yes | | Vulnerability | – | Yes | | DDoS | – | Yes | | Network Scanning | – | Yes | | Port Scanning | – | Yes | | Data Breach | – | Yes | ### Core features **crt.sh** 5 features listed. Sign in on the page to see them. **DDactic Attack Surface Discovery** 10 features listed. Sign in on the page to see them. ### Integrations **crt.sh** 1 integration listed. Sign in on the page to see them. **DDactic Attack Surface Discovery** 12 integrations listed. Sign in on the page to see them. ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [crt.sh](https://cybersectools.com/tools/crt-sh) fits if you need to run it on your own servers, you need a free product and you want an open-source product. - [DDactic Attack Surface Discovery](https://cybersectools.com/tools/ddactic-attack-surface-discovery) fits if you want a cloud product. ## crt.sh vs DDactic Attack Surface Discovery FAQ Common questions when comparing crt.sh vs DDactic Attack Surface Discovery for external attack surface management. ### What is the difference between crt.sh and DDactic Attack Surface Discovery? **crt.sh**: Bash script for subdomain enumeration via crt.sh certificate transparency logs. **DDactic Attack Surface Discovery**: Scans domains to discover attack surface, vulnerabilities, and generate hardening. Built by DDactic. The table above shows where their features, integrations, deployment and company size fit differ. ### Who makes crt.sh and DDactic Attack Surface Discovery? **crt.sh** is open-source. **DDactic Attack Surface Discovery** is made by DDactic founded in 2026-01-01T00:00:00.000Z. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit. ### Is crt.sh a good alternative to DDactic Attack Surface Discovery? Often, yes. crt.sh and DDactic Attack Surface Discovery are both External Attack Surface Management products, and both cover Subdomain Enumeration, DNS Security, Security Scanning. Key differences: crt.sh is Free while DDactic Attack Surface Discovery is Commercial. Use the table above to see where features, deployment and company size fit differ. ## Related comparisons - [crt.sh vs SurfaceDiff](https://cybersectools.com/compare/crt-sh-vs-surfacediff) - [crt.sh vs MGM Security Partners recon me](https://cybersectools.com/compare/crt-sh-vs-mgm-security-partners-recon-me) - [crt.sh vs Cylana EASM](https://cybersectools.com/compare/crt-sh-vs-cylana-easm) - [DDactic Attack Surface Discovery vs SurfaceDiff](https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-surfacediff) - [DDactic Attack Surface Discovery vs MGM Security Partners recon me](https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-mgm-security-partners-recon-me) - [DDactic Attack Surface Discovery vs Cylana EASM](https://cybersectools.com/compare/cylana-easm-vs-ddactic-attack-surface-discovery) ## Alternatives to each - [See all crt.sh alternatives](https://cybersectools.com/alternatives/crt-sh) - [See all DDactic Attack Surface Discovery alternatives](https://cybersectools.com/alternatives/ddactic-attack-surface-discovery) --- Source: https://cybersectools.com/compare/crt-sh-vs-ddactic-attack-surface-discovery For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/crt-sh.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on crt.sh and DDactic Attack Surface Discovery: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md