# Censys Python Library vs SurfaceDiff: side-by-side comparison (2026)

[Censys Python Library](https://cybersectools.com/tools/censys-python-library) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. [SurfaceDiff](https://cybersectools.com/tools/surfacediff) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [SurfaceDiff](https://cybersectools.com/companies/surfacediff). Features, integrations, deployment and the company behind each one, side by side.

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## Side-by-side comparison

| | Censys Python Library | SurfaceDiff |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| GitHub stars | 457 | – |
| Last commit | Dec 2025 | – |
| Company | – | SurfaceDiff |
| Headquarters | – | – |

### Use cases and capabilities

| | Censys Python Library | SurfaceDiff |
|---|---|---|
| Reconnaissance | Yes | Yes |
| DNS Security | – | Yes |
| Port Scanning | – | Yes |
| TLS | – | Yes |
| Subdomain Enumeration | – | Yes |
| Network Scanning | – | Yes |
| Security Scanning | – | Yes |
| Alerting | – | Yes |
| Visibility | – | Yes |
| Web Security | – | Yes |

### Core features

**Censys Python Library**

No features listed.

**SurfaceDiff**

9 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.

- [Censys Python Library](https://cybersectools.com/tools/censys-python-library) fits if you need a free product and you want an open-source product.

## Censys Python Library vs SurfaceDiff FAQ

Common questions when comparing Censys Python Library vs SurfaceDiff for external attack surface management.

### What is the difference between Censys Python Library and SurfaceDiff?

**Censys Python Library**: An easy-to-use and lightweight API wrapper for Censys APIs with support for Python 3.8+.

**SurfaceDiff**: Continuous external attack surface monitoring that shows what changed between scans, built by SurfaceDiff.

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

### Who makes Censys Python Library and SurfaceDiff?

**Censys Python Library** is open-source with 457 GitHub stars. **SurfaceDiff** is made by SurfaceDiff. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Censys Python Library a good alternative to SurfaceDiff?

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

## Related comparisons

- [Censys Python Library vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/censys-python-library-vs-ddactic-attack-surface-discovery)
- [Censys Python Library vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-censys-python-library)
- [Censys Python Library vs Trickest ASM - Attack Surface Management](https://cybersectools.com/compare/censys-python-library-vs-trickest-asm-attack-surface-management)
- [SurfaceDiff vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-surfacediff)
- [SurfaceDiff vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-surfacediff)
- [SurfaceDiff vs Trickest ASM - Attack Surface Management](https://cybersectools.com/compare/surfacediff-vs-trickest-asm-attack-surface-management)

## Alternatives to each

- [See all Censys Python Library alternatives](https://cybersectools.com/alternatives/censys-python-library)
- [See all SurfaceDiff alternatives](https://cybersectools.com/alternatives/surfacediff)

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Source: https://cybersectools.com/compare/censys-python-library-vs-surfacediff

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

More on Censys Python Library and SurfaceDiff: 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