# crt.guru vs ctlogs.dev: side-by-side comparison (2026)

[crt.guru](https://cybersectools.com/tools/crtguru) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Crt.guru](https://cybersectools.com/companies/crtguru). [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.

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

| | crt.guru | ctlogs.dev |
|---|---|---|
| Pricing model | Commercial | 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 |
| Company | Crt.guru | Apps34 |
| Headquarters | – | – |

### Use cases and capabilities

| | crt.guru | ctlogs.dev |
|---|---|---|
| TLS | Yes | Yes |
| SSL | Yes | Yes |
| PCI DSS | Yes | – |
| NIST | Yes | – |
| Security Scanning | Yes | – |
| Alerting | Yes | – |
| Security Compliance Training | Yes | – |
| Security Reporting | Yes | – |
| Vulnerability | Yes | – |
| REST API | Yes | Yes |
| Reconnaissance | – | Yes |
| OSINT | – | Yes |
| Cyber Threat Intelligence | – | Yes |
| DNS Security | – | Yes |
| Attack Detection | – | Yes |
| Subdomain Enumeration | – | Yes |

### Core features

**crt.guru**

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

**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

**crt.guru**

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

**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.

- [crt.guru](https://cybersectools.com/tools/crtguru) fits if you are a small business or a mid-market company or an enterprise.

## crt.guru vs ctlogs.dev FAQ

Common questions when comparing crt.guru vs ctlogs.dev for external attack surface management.

### What is the difference between crt.guru and ctlogs.dev?

**crt.guru**: External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports. Built by Crt.guru.

**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 crt.guru and ctlogs.dev?

**crt.guru** is made by Crt.guru. **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 crt.guru a good alternative to ctlogs.dev?

Often, yes. crt.guru and ctlogs.dev are both External Attack Surface Management products, and both cover SSL, TLS, REST API. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [crt.guru vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-crtguru)
- [crt.guru vs SurfaceDiff](https://cybersectools.com/compare/crtguru-vs-surfacediff)
- [crt.guru vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/crtguru-vs-ddactic-attack-surface-discovery)
- [ctlogs.dev vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-ctlogsdev)
- [ctlogs.dev vs SurfaceDiff](https://cybersectools.com/compare/ctlogsdev-vs-surfacediff)
- [ctlogs.dev vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/ctlogsdev-vs-ddactic-attack-surface-discovery)

## Alternatives to each

- [See all crt.guru alternatives](https://cybersectools.com/alternatives/crtguru)
- [See all ctlogs.dev alternatives](https://cybersectools.com/alternatives/ctlogsdev)

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Source: https://cybersectools.com/compare/crtguru-vs-ctlogsdev

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

More on crt.guru 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