# Cylana EASM vs s3viewer: side-by-side comparison (2026)

[Cylana EASM](https://cybersectools.com/tools/cylana-easm) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Cylana](https://cybersectools.com/companies/cylana). [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

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

### Use cases and capabilities

| | Cylana EASM | s3viewer |
|---|---|---|
| Network Discovery | Yes | – |
| Subdomain Enumeration | Yes | – |
| Attack Detection | Yes | – |
| Reconnaissance | Yes | – |
| Security Scanning | Yes | – |
| Inventory | Yes | – |
| Network Mapping | Yes | – |
| Visibility | Yes | – |
| Vulnerability | Yes | – |
| Digital Risk Protection | Yes | – |
| Azure | – | Yes |
| S3 | – | Yes |
| AWS | – | Yes |
| Misconfiguration | – | Yes |

### Core features

**Cylana EASM**

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

**s3viewer**

No features listed.

## Which one fits you

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

- [s3viewer](https://cybersectools.com/tools/s3viewer) fits if you need a free product and you want an open-source product.

## Cylana EASM vs s3viewer FAQ

Common questions when comparing Cylana EASM vs s3viewer for external attack surface management.

### What is the difference between Cylana EASM and s3viewer?

**Cylana EASM**: AI-powered EASM platform for digital asset discovery and monitoring. Built by Cylana.

**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 Cylana EASM and s3viewer?

**Cylana EASM** is made by Cylana. **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 Cylana EASM a good alternative to s3viewer?

Often, yes. Cylana EASM and s3viewer are both External Attack Surface Management products. Key differences: Cylana EASM 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

- [Cylana EASM vs Attaxion](https://cybersectools.com/compare/attaxion-vs-cylana-easm)
- [Cylana EASM vs Vulneri ASM](https://cybersectools.com/compare/cylana-easm-vs-vulneri-asm-attack-surface-management)
- [Cylana EASM vs MGM Security Partners recon me](https://cybersectools.com/compare/cylana-easm-vs-mgm-security-partners-recon-me)
- [s3viewer vs Attaxion](https://cybersectools.com/compare/attaxion-vs-s3viewer)
- [s3viewer vs Vulneri ASM](https://cybersectools.com/compare/s3viewer-vs-vulneri-asm-attack-surface-management)
- [s3viewer vs MGM Security Partners recon me](https://cybersectools.com/compare/mgm-security-partners-recon-me-vs-s3viewer)

## Alternatives to each

- [See all Cylana EASM alternatives](https://cybersectools.com/alternatives/cylana-easm)
- [See all s3viewer alternatives](https://cybersectools.com/alternatives/s3viewer)

---

Source: https://cybersectools.com/compare/cylana-easm-vs-s3viewer

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

More on Cylana EASM 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