# DNS Assistant vs s3viewer: side-by-side comparison (2026)

[DNS Assistant](https://cybersectools.com/tools/dns-assistant) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [DNS Assistant](https://cybersectools.com/companies/dns-assistant). [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

| | DNS Assistant | 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 | DNS Assistant | – |
| Headquarters | – | – |

### Use cases and capabilities

| | DNS Assistant | s3viewer |
|---|---|---|
| DNS Security | Yes | – |
| Alerting | Yes | – |
| RBAC | Yes | – |
| Multi Tenancy | Yes | – |
| REST API | Yes | – |
| MFA | Yes | – |
| Configuration Management | Yes | – |
| Misconfiguration | Yes | Yes |
| Azure | – | Yes |
| S3 | – | Yes |
| AWS | – | Yes |

### Core features

**DNS Assistant**

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

**s3viewer**

No features listed.

### Integrations

**DNS Assistant**

3 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.

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

## DNS Assistant vs s3viewer FAQ

Common questions when comparing DNS Assistant vs s3viewer for external attack surface management.

### What is the difference between DNS Assistant and s3viewer?

**DNS Assistant**: DNS posture mgmt platform for real-time DNS & WHOIS change monitoring. Built by DNS Assistant.

**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 DNS Assistant and s3viewer?

**DNS Assistant** is made by DNS Assistant founded in 2025-01-01T00:00:00.000Z. **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 DNS Assistant a good alternative to s3viewer?

Often, yes. DNS Assistant and s3viewer are both External Attack Surface Management products, and both cover Misconfiguration. Key differences: DNS Assistant 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

- [DNS Assistant vs Cyber Exposure Manager](https://cybersectools.com/compare/dns-assistant-vs-galileo-security)
- [DNS Assistant vs Intruder Attack Surface Management](https://cybersectools.com/compare/dns-assistant-vs-intruder-attack-surface-management)
- [DNS Assistant vs Detectify Surface Monitoring](https://cybersectools.com/compare/detectify-surface-monitoring-vs-dns-assistant)
- [s3viewer vs Cyber Exposure Manager](https://cybersectools.com/compare/galileo-security-vs-s3viewer)
- [s3viewer vs Intruder Attack Surface Management](https://cybersectools.com/compare/intruder-attack-surface-management-vs-s3viewer)
- [s3viewer vs Detectify Surface Monitoring](https://cybersectools.com/compare/detectify-surface-monitoring-vs-s3viewer)

## Alternatives to each

- [See all DNS Assistant alternatives](https://cybersectools.com/alternatives/dns-assistant)
- [See all s3viewer alternatives](https://cybersectools.com/alternatives/s3viewer)

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Source: https://cybersectools.com/compare/dns-assistant-vs-s3viewer

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

More on DNS Assistant 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