# Amass vs crt.sh: side-by-side comparison (2026)

[Amass](https://cybersectools.com/tools/amass) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. [crt.sh](https://cybersectools.com/tools/crt-sh) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. 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

| | Amass | crt.sh |
|---|---|---|
| Pricing model | Free | Free |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | On-Premises | On-Premises |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| GitHub stars | 14,260 | – |
| Last commit | Sep 2025 | – |

### Use cases and capabilities

| | Amass | crt.sh |
|---|---|---|
| Reconnaissance | Yes | Yes |
| Open Source | Yes | Yes |
| Network Reconnaissance | Yes | Yes |
| Subdomain Enumeration | Yes | Yes |
| DNS Security | Yes | Yes |
| Bug Bounty | – | Yes |
| Enumeration | – | Yes |
| SSL | – | Yes |
| Security Scanning | – | Yes |

### Core features

**Amass**

No features listed.

**crt.sh**

5 features listed. Sign in on the page to see them.

### Integrations

**Amass**

No integrations listed.

**crt.sh**

1 integration listed. Sign in on the page to see them.

## Amass vs crt.sh FAQ

Common questions when comparing Amass vs crt.sh for external attack surface management.

### What is the difference between Amass and crt.sh?

**Amass**: Amass is an open-source OWASP tool for comprehensive attack surface mapping and asset discovery through domain reconnaissance and subdomain enumeration.

**crt.sh**: Bash script for subdomain enumeration via crt.sh certificate transparency logs.

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes Amass and crt.sh?

**Amass** is open-source with 14,260 GitHub stars. **crt.sh** is open-source. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Amass a good alternative to crt.sh?

Often, yes. Amass and crt.sh are both External Attack Surface Management products, and both cover Subdomain Enumeration, Reconnaissance, Open Source. Key differences: Amass is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Amass vs MGM Security Partners recon me](https://cybersectools.com/compare/amass-vs-mgm-security-partners-recon-me)
- [Amass vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/amass-vs-ddactic-attack-surface-discovery)
- [Amass vs SurfaceDiff](https://cybersectools.com/compare/amass-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 DDactic Attack Surface Discovery](https://cybersectools.com/compare/crt-sh-vs-ddactic-attack-surface-discovery)
- [crt.sh vs SurfaceDiff](https://cybersectools.com/compare/crt-sh-vs-surfacediff)

## Alternatives to each

- [See all Amass alternatives](https://cybersectools.com/alternatives/amass)
- [See all crt.sh alternatives](https://cybersectools.com/alternatives/crt-sh)

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Source: https://cybersectools.com/compare/amass-vs-crt-sh

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/amass.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Amass and crt.sh: 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