# s3viewer vs Vulneri ASM: side-by-side comparison (2026)

[s3viewer](https://cybersectools.com/tools/s3viewer) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. [Vulneri ASM](https://cybersectools.com/tools/vulneri-asm-attack-surface-management) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Vulneri](https://cybersectools.com/companies/vulneri). 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

| | s3viewer | Vulneri ASM |
|---|---|---|
| Pricing model | Free | Commercial |
| 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 | – | Vulneri |
| Headquarters | – | – |

### Use cases and capabilities

| | s3viewer | Vulneri ASM |
|---|---|---|
| Azure | Yes | – |
| S3 | Yes | – |
| AWS | Yes | – |
| Misconfiguration | Yes | Yes |
| Attack Paths | – | Yes |
| Vulnerability Prioritization | – | Yes |
| Reconnaissance | – | Yes |
| Network Discovery | – | Yes |
| Visibility | – | Yes |
| Security Reporting | – | Yes |
| Inventory | – | Yes |
| Third Party Security | – | Yes |
| Vulnerability | – | Yes |

### Core features

**s3viewer**

No features listed.

**Vulneri ASM**

10 features 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.

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

## s3viewer vs Vulneri ASM FAQ

Common questions when comparing s3viewer vs Vulneri ASM for external attack surface management.

### What is the difference between s3viewer and Vulneri ASM?

**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.

**Vulneri ASM**: ASM platform for continuous discovery and risk validation of internet-exposed assets. Built by Vulneri.

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

### Who makes s3viewer and Vulneri ASM?

**s3viewer** is open-source with 448 GitHub stars. **Vulneri ASM** is made by Vulneri. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is s3viewer a good alternative to Vulneri ASM?

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

## Related comparisons

- [s3viewer vs Attaxion](https://cybersectools.com/compare/attaxion-vs-s3viewer)
- [s3viewer vs CyCognito EASM Platform](https://cybersectools.com/compare/cycognito-easm-platform-vs-s3viewer)
- [s3viewer vs Cylana EASM](https://cybersectools.com/compare/cylana-easm-vs-s3viewer)
- [Vulneri ASM vs Attaxion](https://cybersectools.com/compare/attaxion-vs-vulneri-asm-attack-surface-management)
- [Vulneri ASM vs CyCognito EASM Platform](https://cybersectools.com/compare/cycognito-easm-platform-vs-vulneri-asm-attack-surface-management)
- [Vulneri ASM vs Cylana EASM](https://cybersectools.com/compare/cylana-easm-vs-vulneri-asm-attack-surface-management)

## Alternatives to each

- [See all s3viewer alternatives](https://cybersectools.com/alternatives/s3viewer)
- [See all Vulneri ASM alternatives](https://cybersectools.com/alternatives/vulneri-asm-attack-surface-management)

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Source: https://cybersectools.com/compare/s3viewer-vs-vulneri-asm-attack-surface-management

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/s3viewer.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on s3viewer and Vulneri ASM: 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