# GreatHorn Mailbox Intelligence vs Phishing Catcher: side-by-side comparison (2026)

[GreatHorn Mailbox Intelligence](https://cybersectools.com/tools/greathorn-mailbox-intelligence) is a commercial [anti-phishing](https://cybersectools.com/categories/anti-phishing) solution by [GreatHorn](https://cybersectools.com/companies/greathorn). [Phishing Catcher](https://cybersectools.com/tools/phishing-catcher) is a free [anti-phishing](https://cybersectools.com/categories/anti-phishing) solution. Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | GreatHorn Mailbox Intelligence | Phishing Catcher |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | Anti-Phishing | Anti-Phishing |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| GitHub stars | – | 1,757 |
| Last commit | – | Dec 2020 |
| Company | GreatHorn | – |
| Headquarters | – | – |

### Use cases and capabilities

| | GreatHorn Mailbox Intelligence | Phishing Catcher |
|---|---|---|
| Microsoft 365 | Yes | – |
| TLS | – | Yes |

### Core features

**GreatHorn Mailbox Intelligence**

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

**Phishing Catcher**

No features listed.

### Integrations

**GreatHorn Mailbox Intelligence**

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

**Phishing Catcher**

No integrations listed.

## Which one fits you

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

- [GreatHorn Mailbox Intelligence](https://cybersectools.com/tools/greathorn-mailbox-intelligence) fits if you want a cloud product.
- [Phishing Catcher](https://cybersectools.com/tools/phishing-catcher) fits if you need to run it on your own servers, you need a free product and you want an open-source product.

## GreatHorn Mailbox Intelligence vs Phishing Catcher FAQ

Common questions when comparing GreatHorn Mailbox Intelligence vs Phishing Catcher for anti-phishing.

### What is the difference between GreatHorn Mailbox Intelligence and Phishing Catcher?

**GreatHorn Mailbox Intelligence**: Email security tool empowering users to identify & report phishing threats. Built by GreatHorn.

**Phishing Catcher**: Catch possible phishing domains in near real time by looking for suspicious TLS certificate issuances reported to the Certificate Transparency Log (CTL) via the CertStream API.

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

### Who makes GreatHorn Mailbox Intelligence and Phishing Catcher?

**GreatHorn Mailbox Intelligence** is made by GreatHorn. **Phishing Catcher** is open-source with 1,757 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is GreatHorn Mailbox Intelligence a good alternative to Phishing Catcher?

Often, yes. GreatHorn Mailbox Intelligence and Phishing Catcher are both Anti-Phishing products. Key differences: GreatHorn Mailbox Intelligence is Commercial while Phishing Catcher is Free, Phishing Catcher is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [GreatHorn Mailbox Intelligence vs Egress Defend](https://cybersectools.com/compare/egress-defend-vs-greathorn-mailbox-intelligence)
- [GreatHorn Mailbox Intelligence vs PhishingBox KillPhish](https://cybersectools.com/compare/greathorn-mailbox-intelligence-vs-phishingbox-killphish)
- [GreatHorn Mailbox Intelligence vs Detect-Phish](https://cybersectools.com/compare/detect-phish-vs-greathorn-mailbox-intelligence)
- [Phishing Catcher vs Egress Defend](https://cybersectools.com/compare/egress-defend-vs-phishing-catcher)
- [Phishing Catcher vs PhishingBox KillPhish](https://cybersectools.com/compare/phishing-catcher-vs-phishingbox-killphish)
- [Phishing Catcher vs Detect-Phish](https://cybersectools.com/compare/detect-phish-vs-phishing-catcher)

## Alternatives to each

- [See all GreatHorn Mailbox Intelligence alternatives](https://cybersectools.com/alternatives/greathorn-mailbox-intelligence)
- [See all Phishing Catcher alternatives](https://cybersectools.com/alternatives/phishing-catcher)

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Source: https://cybersectools.com/compare/greathorn-mailbox-intelligence-vs-phishing-catcher

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

More on GreatHorn Mailbox Intelligence and Phishing Catcher: 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