WorkOS Radar is a comprehensive solution that offers device fingerprinting, intelligent rate limiting, and out-of-the-box detections for bot detection and prevention. It automatically blocks common threats like credential stuffing and brute force attacks, with flexible settings that can be tailored to your app. Castle is another robust solution that uses AI scoring, whitelist/blacklist, custom rules, and behavioral analysis to detect and prevent fraud. Both solutions offer more features than Auth0, Stytch, and Arcjet, which are more basic and rely on IP addresses, making them prone to false positives. When choosing a solution, consider the fees, implementation time, and the sturdiness of the defenses offered.