# Amass vs Projectdiscovery.io | Chaos: 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. [Projectdiscovery.io | Chaos](https://cybersectools.com/tools/projectdiscoveryio-or-chaos) 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, Google Mandiant Attack Surface Management and 4 more.

## Side-by-side comparison

| | Amass | Projectdiscovery.io \| Chaos |
|---|---|---|
| Pricing model | Free | Free |
| 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 |
| GitHub stars | 14,260 | – |
| Last commit | Sep 2025 | – |

### Use cases and capabilities

| | Amass | Projectdiscovery.io \| Chaos |
|---|---|---|
| Reconnaissance | Yes | – |
| Open Source | Yes | – |
| Network Reconnaissance | Yes | – |
| Subdomain Enumeration | Yes | Yes |
| DNS Security | Yes | Yes |

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [Amass](https://cybersectools.com/tools/amass) fits if you need to run it on your own servers and you want an open-source product.
- [Projectdiscovery.io | Chaos](https://cybersectools.com/tools/projectdiscoveryio-or-chaos) fits if you want a cloud product.

## Amass vs Projectdiscovery.io | Chaos FAQ

Common questions when comparing Amass vs Projectdiscovery.io | Chaos for external attack surface management.

### What is the difference between Amass and Projectdiscovery.io | Chaos?

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

**Projectdiscovery.io | Chaos**: A powerful enumeration tool for discovering assets and subdomains.

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

### Is Amass a good alternative to Projectdiscovery.io | Chaos?

Often, yes. Amass and Projectdiscovery.io | Chaos are both External Attack Surface Management products, and both cover DNS Security, Subdomain Enumeration. 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 SurfaceDiff](https://cybersectools.com/compare/amass-vs-surfacediff)
- [Amass vs ctlogs.dev](https://cybersectools.com/compare/amass-vs-ctlogsdev)
- [Projectdiscovery.io | Chaos vs MGM Security Partners recon me](https://cybersectools.com/compare/mgm-security-partners-recon-me-vs-projectdiscoveryio-or-chaos)
- [Projectdiscovery.io | Chaos vs SurfaceDiff](https://cybersectools.com/compare/projectdiscoveryio-or-chaos-vs-surfacediff)
- [Projectdiscovery.io | Chaos vs ctlogs.dev](https://cybersectools.com/compare/ctlogsdev-vs-projectdiscoveryio-or-chaos)

## Alternatives to each

- [See all Amass alternatives](https://cybersectools.com/alternatives/amass)
- [See all Projectdiscovery.io | Chaos alternatives](https://cybersectools.com/alternatives/projectdiscoveryio-or-chaos)

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Source: https://cybersectools.com/compare/projectdiscoveryio-or-chaos-vs-amass

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 Projectdiscovery.io | Chaos: 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