About

2014

San Francisco, California

Security & Compliance

Instantly stop automated and human-originated account takeovers, fake accounts, and any behavior that violates your platform policies.

Funding

$11.6 million

Undisclosed

First Round Capital, Index Ventures, Y Combinator, F-Prime

Castle customers include Atlassian, Rent the Runway, Wonolo, Yieldstreet, GoTo, and DailyPay.

Sebastian Wallin: Co-Founder & Chief Architect of Castle. Former Co-Founder of Popdevelop.

Lisa Rydje: Chief of Staff at Castle. Former Group Lead at Feministiskt initiativ.

Valerie Kirk: Director of Business Operations at Castle. Former Operations Manager at Etheric Networks.