Overview
Developer-first bot detection and fraud prevention. No CAPTCHAs required.
Castle stops bots and fraud through behavioral analysis - no puzzles for your users to solve.
Choose your path
Protect logins
Detect account takeovers and credential stuffing
Stop fake signups
Block bot registrations and human multi-accounting
Secure transactions
Block or review high-value transactions in real time
Full integration - Want end-to-end setup? Start with the Integration guide.
Updated 1 day ago
What’s Next