# Certstream vs SecurityTrails API™: side-by-side comparison (2026)

[Certstream](https://cybersectools.com/tools/certstream) is a free [threat intel feeds](https://cybersectools.com/categories/threat-intel-feeds) solution. [SecurityTrails API™](https://cybersectools.com/tools/securitytrails-apitm) is a commercial [threat intel feeds](https://cybersectools.com/categories/threat-intel-feeds) solution by [SecurityTrails](https://cybersectools.com/companies/securitytrails). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Certstream | SecurityTrails API™ |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | Threat Intel Feeds | Threat Intel Feeds |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| Company | – | SecurityTrails |
| Headquarters | – | – |

### Use cases and capabilities

| | Certstream | SecurityTrails API™ |
|---|---|---|
| SSL | Yes | – |
| DNS Security | – | Yes |
| Cyber Threat Intelligence | – | Yes |
| Subdomain Enumeration | – | Yes |
| IP Address | – | Yes |
| Reconnaissance | – | Yes |
| Threat Research | – | Yes |
| REST API | – | Yes |
| Fingerprinting | – | Yes |
| Investigation | – | Yes |

### Core features

**Certstream**

No features listed.

**SecurityTrails API™**

10 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.

- [Certstream](https://cybersectools.com/tools/certstream) fits if you are a startup and you need a free product.

## Certstream vs SecurityTrails API™ FAQ

Common questions when comparing Certstream vs SecurityTrails API™ for threat intel feeds.

### What is the difference between Certstream and SecurityTrails API™?

**Certstream**: Real-time monitoring tool for newly issued SSL certificates.

**SecurityTrails API™**: API providing historical & current DNS, WHOIS, and domain intelligence data. Built by SecurityTrails.

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

### Is Certstream a good alternative to SecurityTrails API™?

Often, yes. Certstream and SecurityTrails API™ are both Threat Intel Feeds products. Key differences: Certstream is Free while SecurityTrails API™ is Commercial. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Certstream vs Packet Forensics Cyber Intelligence](https://cybersectools.com/compare/certstream-vs-packet-forensics-cyber-intelligence)
- [Certstream vs IPQS IP Address Abuse Feed](https://cybersectools.com/compare/certstream-vs-ipqs-ip-address-abuse-feed)
- [Certstream vs Farsight Security DNSDB](https://cybersectools.com/compare/certstream-vs-farsight-security-dnsdb)
- [SecurityTrails API™ vs Packet Forensics Cyber Intelligence](https://cybersectools.com/compare/packet-forensics-cyber-intelligence-vs-securitytrails-apitm)
- [SecurityTrails API™ vs IPQS IP Address Abuse Feed](https://cybersectools.com/compare/ipqs-ip-address-abuse-feed-vs-securitytrails-apitm)
- [SecurityTrails API™ vs Farsight Security DNSDB](https://cybersectools.com/compare/farsight-security-dnsdb-vs-securitytrails-apitm)

## Alternatives to each

- [See all Certstream alternatives](https://cybersectools.com/alternatives/certstream)
- [See all SecurityTrails API™ alternatives](https://cybersectools.com/alternatives/securitytrails-apitm)

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Source: https://cybersectools.com/compare/certstream-vs-securitytrails-apitm

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

More on Certstream and SecurityTrails API™: 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