Castle Intelligence

Castle is a user identity company founded by Johan Brissmyr and Sebastian Wallin based in San Francisco. Castle offers an end-to-end solution for user security and account takeover (ATO) prevention. Developers use Castle's APIs to detect automated credential stuffing attacks and human-powered ATOs, automate the recovery process, and breathe easy with zero false lockouts or support queues. Castle is funded by First Round, Index Ventures and Y Combinator.