# DDactic Attack Surface Discovery vs s3viewer: side-by-side comparison (2026)

[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). [s3viewer](https://cybersectools.com/tools/s3viewer) 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

| | DDactic Attack Surface Discovery | s3viewer |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| GitHub stars | – | 448 |
| Last commit | – | Jul 2023 |
| Company | DDactic | – |
| Headquarters | – | – |

### Use cases and capabilities

| | DDactic Attack Surface Discovery | s3viewer |
|---|---|---|
| Subdomain Enumeration | Yes | – |
| Vulnerability | Yes | – |
| DDoS | Yes | – |
| DNS Security | Yes | – |
| Network Scanning | Yes | – |
| Security Scanning | Yes | – |
| Port Scanning | Yes | – |
| SSL | Yes | – |
| Data Breach | Yes | – |
| Reconnaissance | Yes | – |
| Azure | – | Yes |
| S3 | – | Yes |
| AWS | – | Yes |
| Misconfiguration | – | Yes |

### Core features

**DDactic Attack Surface Discovery**

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

**s3viewer**

No features listed.

### Integrations

**DDactic Attack Surface Discovery**

12 integrations listed. Sign in on the page to see them.

**s3viewer**

No integrations listed.

## Which one fits you

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

- [DDactic Attack Surface Discovery](https://cybersectools.com/tools/ddactic-attack-surface-discovery) fits if you are a startup.
- [s3viewer](https://cybersectools.com/tools/s3viewer) fits if you need a free product and you want an open-source product.

## DDactic Attack Surface Discovery vs s3viewer FAQ

Common questions when comparing DDactic Attack Surface Discovery vs s3viewer for external attack surface management.

### What is the difference between DDactic Attack Surface Discovery and s3viewer?

**DDactic Attack Surface Discovery**: Scans domains to discover attack surface, vulnerabilities, and generate hardening. Built by DDactic.

**s3viewer**: A storage exploration tool that provides unified access to view publicly accessible Amazon S3 buckets, Azure Blob storage, FTP servers, and HTTP directory listings.

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

### Who makes DDactic Attack Surface Discovery and s3viewer?

**DDactic Attack Surface Discovery** is made by DDactic founded in 2026-01-01T00:00:00.000Z. **s3viewer** is open-source with 448 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is DDactic Attack Surface Discovery a good alternative to s3viewer?

Often, yes. DDactic Attack Surface Discovery and s3viewer are both External Attack Surface Management products. Key differences: DDactic Attack Surface Discovery is Commercial while s3viewer is Free, s3viewer is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [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 ThreatDefence Integrated ASM](https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-threatdefence-integrated-asm)
- [s3viewer vs SurfaceDiff](https://cybersectools.com/compare/s3viewer-vs-surfacediff)
- [s3viewer vs MGM Security Partners recon me](https://cybersectools.com/compare/mgm-security-partners-recon-me-vs-s3viewer)
- [s3viewer vs ThreatDefence Integrated ASM](https://cybersectools.com/compare/s3viewer-vs-threatdefence-integrated-asm)

## Alternatives to each

- [See all DDactic Attack Surface Discovery alternatives](https://cybersectools.com/alternatives/ddactic-attack-surface-discovery)
- [See all s3viewer alternatives](https://cybersectools.com/alternatives/s3viewer)

---

Source: https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-s3viewer

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

More on DDactic Attack Surface Discovery and s3viewer: 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