# Censys Python Library vs ctlogs.dev: 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. [ctlogs.dev](https://cybersectools.com/tools/ctlogsdev) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Apps34](https://cybersectools.com/companies/apps34). Features, integrations, deployment and the company behind each one, side by side.

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## Side-by-side comparison

| | Censys Python Library | ctlogs.dev |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | Verified |
| Deployment type | Cloud | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Startup |
| GitHub stars | 457 | – |
| Last commit | Dec 2025 | – |
| Company | – | Apps34 |
| Headquarters | – | – |

### Use cases and capabilities

| | Censys Python Library | ctlogs.dev |
|---|---|---|
| Reconnaissance | Yes | Yes |
| OSINT | – | Yes |
| SSL | – | Yes |
| TLS | – | Yes |
| REST API | – | Yes |
| Cyber Threat Intelligence | – | Yes |
| DNS Security | – | Yes |
| Attack Detection | – | Yes |
| Subdomain Enumeration | – | Yes |

### Core features

**Censys Python Library**

No features listed.

**ctlogs.dev**

- Real-time Certificate Transparency Search
- Automated Subdomain Enumeration
- High-Performance REST JSON API
- Wildcard & Fingerprint Matching
- SSL/TLS Certificate History Tracking
- Attack Surface Mapping
- Historical Log Archiving
- Instant Domain & Issuer Filtering

### Integrations

**Censys Python Library**

No integrations listed.

**ctlogs.dev**

- REST API
- cURL
- Python
- JSON
- Webhooks
- SIEM

## 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 are a small business or a mid-market company or an enterprise, you need a free product and you want an open-source product.

## Censys Python Library vs ctlogs.dev FAQ

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

### What is the difference between Censys Python Library and ctlogs.dev?

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

**ctlogs.dev**: Fast Certificate Transparency search and JSON API for subdomain reconnaissance, built by Apps34. Core capabilities include Real-time Certificate Transparency Search, Automated Subdomain Enumeration, High-Performance REST JSON API.

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

### Who makes Censys Python Library and ctlogs.dev?

**Censys Python Library** is open-source with 457 GitHub stars. **ctlogs.dev** is made by Apps34. 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 ctlogs.dev?

Often, yes. Censys Python Library and ctlogs.dev are both External Attack Surface Management products, and both cover Reconnaissance. Key differences: Censys Python Library is Free while ctlogs.dev 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 SurfaceDiff](https://cybersectools.com/compare/censys-python-library-vs-surfacediff)
- [Censys Python Library vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-censys-python-library)
- [Censys Python Library vs MGM Security Partners recon me](https://cybersectools.com/compare/censys-python-library-vs-mgm-security-partners-recon-me)
- [ctlogs.dev vs SurfaceDiff](https://cybersectools.com/compare/ctlogsdev-vs-surfacediff)
- [ctlogs.dev vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-ctlogsdev)
- [ctlogs.dev vs MGM Security Partners recon me](https://cybersectools.com/compare/ctlogsdev-vs-mgm-security-partners-recon-me)

## Alternatives to each

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

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

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 ctlogs.dev: 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