# ShadowServer vs Unit221B eWitness: side-by-side comparison (2026)

[ShadowServer](https://cybersectools.com/tools/shadowserver) is a free [threat intel platforms](https://cybersectools.com/categories/tip) solution. [Unit221B eWitness](https://cybersectools.com/tools/unit221b-ewitness) is a commercial [threat intel platforms](https://cybersectools.com/categories/tip) solution by [Unit 221B](https://cybersectools.com/companies/unit-221b). Features, integrations, deployment and the company behind each one, side by side.

Need the answer fast? [Best Threat Intelligence Platform Solutions for Business](https://cybersectools.com/shortlists/best-threat-intelligence-platforms) picks Recorded Future Threat Intelligence, Google Threat Intelligence, CrowdStrike Falcon Adversary Intelligence and 4 more.

## Side-by-side comparison

| | ShadowServer | Unit221B eWitness |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | Threat Intel Platforms | Threat Intel Platforms |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Enterprise, Mid-Market |
| Company | – | Unit 221B |
| Headquarters | – | – |

### Use cases and capabilities

| | ShadowServer | Unit221B eWitness |
|---|---|---|
| DDoS | Yes | – |
| Threat Feed | Yes | Yes |
| Threat Research | – | Yes |
| Security Research | – | Yes |
| Investigation | – | Yes |
| Cyber Threat Intelligence | – | Yes |
| Dark Web Monitoring | – | Yes |

### Core features

**ShadowServer**

No features listed.

**Unit221B eWitness**

5 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.

- [ShadowServer](https://cybersectools.com/tools/shadowserver) fits if you are a startup or a small business and you need a free product.

## ShadowServer vs Unit221B eWitness FAQ

Common questions when comparing ShadowServer vs Unit221B eWitness for threat intel platforms.

### What is the difference between ShadowServer and Unit221B eWitness?

**ShadowServer**: A nonprofit security organization that collects and shares threat data to make the Internet more secure.

**Unit221B eWitness**: Threat intel platform for discovering cybercrime on encrypted chat networks, built by Unit 221B.

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

### Is ShadowServer a good alternative to Unit221B eWitness?

Often, yes. ShadowServer and Unit221B eWitness are both Threat Intel Platforms products, and both cover Threat Feed. Key differences: ShadowServer is Free while Unit221B eWitness is Commercial. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [ShadowServer vs Ninja Signal](https://cybersectools.com/compare/ninja-signal-vs-shadowserver)
- [ShadowServer vs Validin](https://cybersectools.com/compare/shadowserver-vs-validin)
- [ShadowServer vs Cypho](https://cybersectools.com/compare/cypho-vs-shadowserver)
- [Unit221B eWitness vs Ninja Signal](https://cybersectools.com/compare/ninja-signal-vs-unit221b-ewitness)
- [Unit221B eWitness vs Validin](https://cybersectools.com/compare/unit221b-ewitness-vs-validin)
- [Unit221B eWitness vs Cypho](https://cybersectools.com/compare/cypho-vs-unit221b-ewitness)

## Alternatives to each

- [See all ShadowServer alternatives](https://cybersectools.com/alternatives/shadowserver)
- [See all Unit221B eWitness alternatives](https://cybersectools.com/alternatives/unit221b-ewitness)

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Source: https://cybersectools.com/compare/shadowserver-vs-unit221b-ewitness

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

More on ShadowServer and Unit221B eWitness: 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