# GreyNoise Block vs Opsis OSINT: side-by-side comparison (2026)

[GreyNoise Block](https://cybersectools.com/tools/greynoise-block) is a commercial [threat intel platforms](https://cybersectools.com/categories/tip) solution by [GreyNoise, Inc](https://cybersectools.com/companies/greynoise-inc). [Opsis OSINT](https://cybersectools.com/tools/opsis-osint) is a commercial [threat intel platforms](https://cybersectools.com/categories/tip) solution by [Opsis](https://cybersectools.com/companies/opsis). 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

| | GreyNoise Block | Opsis OSINT |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | Threat Intel Platforms | Threat Intel Platforms |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| Company | GreyNoise, Inc. | Opsis |
| Headquarters | – | – |

### Use cases and capabilities

| | GreyNoise Block | Opsis OSINT |
|---|---|---|
| Attack Detection | Yes | – |
| IP Lookup | Yes | – |
| Vulnerability Exploitation | Yes | – |
| Cyber Threat Intelligence | Yes | Yes |
| OSINT | – | Yes |
| Reconnaissance | – | Yes |
| Search | – | Yes |
| Investigation | – | Yes |
| Social Media | – | Yes |
| Enumeration | – | Yes |
| Fingerprinting | – | Yes |
| GDPR | – | Yes |
| REST API | – | Yes |

### Core features

**GreyNoise Block**

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

**Opsis OSINT**

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

### Integrations

**GreyNoise Block**

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

**Opsis OSINT**

No integrations listed.

## Which one fits you

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

- [Opsis OSINT](https://cybersectools.com/tools/opsis-osint) fits if you are a startup and you want the lower starting price (from $14.99 per month).

## GreyNoise Block vs Opsis OSINT FAQ

Common questions when comparing GreyNoise Block vs Opsis OSINT for threat intel platforms.

### What is the difference between GreyNoise Block and Opsis OSINT?

**GreyNoise Block**: Real-time threat intel platform detecting malicious scanning & exploitation. Built by GreyNoise, Inc.

**Opsis OSINT**: OSINT search: find the accounts behind an email, username or domain across 1,000+ sites. Built by Opsis.

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

### Who makes GreyNoise Block and Opsis OSINT?

**GreyNoise Block** is made by GreyNoise, Inc. **Opsis OSINT** is made by Opsis. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is GreyNoise Block a good alternative to Opsis OSINT?

Often, yes. GreyNoise Block and Opsis OSINT are both Threat Intel Platforms products, and both cover Cyber Threat Intelligence. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [GreyNoise Block vs SecurityTrails API](https://cybersectools.com/compare/greynoise-block-vs-securitytrails)
- [GreyNoise Block vs koat Platform](https://cybersectools.com/compare/greynoise-block-vs-koat-platform)
- [GreyNoise Block vs Validin](https://cybersectools.com/compare/greynoise-block-vs-validin)
- [Opsis OSINT vs SecurityTrails API](https://cybersectools.com/compare/opsis-osint-vs-securitytrails)
- [Opsis OSINT vs koat Platform](https://cybersectools.com/compare/koat-platform-vs-opsis-osint)
- [Opsis OSINT vs Validin](https://cybersectools.com/compare/opsis-osint-vs-validin)

## Alternatives to each

- [See all GreyNoise Block alternatives](https://cybersectools.com/alternatives/greynoise-block)
- [See all Opsis OSINT alternatives](https://cybersectools.com/alternatives/opsis-osint)

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Source: https://cybersectools.com/compare/greynoise-block-vs-opsis-osint

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

More on GreyNoise Block and Opsis OSINT: 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