Castle lets you block bad bots, account takeovers, transaction fraud, and spam — all without the hassle of CAPTCHAs.
| Website | https://castle.io |
| Revenue | $5.5 million |
| Employees | 54 (26 on RocketReach) |
| Founded | 2015 |
| Phone | +1 415-254-9225 |
| Industry | Software Development, Security Software, Software Development & Design, Software |
| Web Rank | 3 Million |
| Keywords | Bot Detection, Account Takeover Protection, Bot Mitigation, Spam Prevention, Fraud Detection, Abuse Prevention, Security, Online Fraud, E-Commerce Security, Payment Security, Risk Management, Cybersecurity, Authentication, Web Security, Authorization, Data Protection, Access Control |
| Competitors | Amazon, Microsoft, Google, Broadcom, Okta, Akamai Technologies, Ping Identity, Auth0 by Okta, Duo Security, OneLogin by One Identity +35 more (view full list) |
| SIC | SIC Code 737 Companies, SIC Code 73 Companies |
| NAICS | NAICS Code 5415 Companies, NAICS Code 54 Companies, NAICS Code 541 Companies |
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Castle Questions
The Castle annual revenue was $5.5 million in 2026.
Johan Brissmyr is the CEO and Co-founder of Castle.
26 people are employed at Castle.
The NAICS codes for Castle are [5415, 54, 541].
The SIC codes for Castle are [737, 73].
Top Castle Employees
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Johan Brissmyr
CEO and Co-founder at Castle
New York, United States21 -
Sebastian Wallin
Co-Founder at Castle
Malmö, SE23 -
Lisa Rydje
VP of Operations at Castle
New York, NY, US23 -
Antoine Vastel
VP of Research at Castle
Nantes, FR1 -
3
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Nadia E.
Staff Solutions Architect at Castle
New York, NY, US4 -
2
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11
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Rafał Malinowski
Staff Software Engineer at Castle
Szczecin, PL2
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