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GreatHorn: The API-First Email Security Play
A lean, $21.8M-funded startup targeting the $12B email security gap with a cloud-native approach.
In a market dominated by legacy appliances and sprawling suites, GreatHorn is betting everything on the API. They're not just another email filter; they're a cloud-native shield for Microsoft 365 and Google Workspace, designed to stop business email compromise (BEC) where it starts: in the API layer.
"GreatHorn isn't fighting the last war; they're building the API layer for the next generation of email attacks."
The Founder-Led Vision
Led by CEO Kevin O'Brien, GreatHorn's leadership team is deeply embedded in the security landscape. With a lean team of 23 engineers and customer success professionals, they are executing a focused, high-velocity strategy. The company's structure suggests a founder-led product vision, prioritizing engineering excellence over bloated sales overhead—a classic sign of a technical founder's playbook.
The Traffic Paradox
Despite a modest global rank of #1.8M, GreatHorn commands a healthy 12,999 monthly visits with a striking 49% direct traffic share. This indicates strong brand recall and a user base that knows exactly where to find them. The organic search traffic (33%) is likely driven by highly specific security queries rather than broad keyword stuffing, pointing to a targeted, intent-driven acquisition strategy.
The keyword data reveals a fascinating signal. Terms like 'us-west-2.amazonses.com' and 'amazonses' appear frequently. This suggests GreatHorn's audience is deeply technical—likely DevOps engineers and security architects troubleshooting email delivery infrastructure. They aren't just buying software; they are solving complex, infrastructure-level problems where email security overlaps with cloud delivery.
- API-Native Architecture: Built specifically for M365 & Google Workspace, not retrofitted.
- Lean Operations: 23 employees generating $2.3M in revenue (~$100k per employee).
- Strategic Funding: $21.8M raised provides a long runway in a crowded market.
- Technical Audience: High intent traffic from infrastructure engineers, not just IT managers.
The API Moat is Real
GreatHorn is positioning itself as the essential security layer for the modern cloud office suite, proving that in security, speed and specificity win over feature bloat.
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Comprehensive Email Security for Microsoft 365 & Google Workspace
GreatHorn is an API, cloud-native email security solution that mitigates the risk of business email compromise across Microsoft 365 and Google Workspace.
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About greathorn.com
GreatHorn is an API, cloud-native email security solution that mitigates the risk of business email compromise across Microsoft 365 and Google Workspace.
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greathorn.com uses 20 technologies across their website including Font Awesome, reCAPTCHA, PHP, and more.
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greathorn.com receives approximately 13.0K monthly visitors and ranks #1,888,073 globally. The website has a bounce rate of 52% with visitors viewing an average of 1.6 pages per visit. Users spend an average of 0:07 on the site.
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