Alternatives to Castle

Arkose Labs provides AI security solutions to protect against bot attacks and fraud.

Reduced Real-Time Bidding (RTB) infrastructure costs by filtering low-value impressions using machine learning.

Verifies digital interactions to distinguish humans from bots and AI, protecting against fraud and abuse.

Combats phishing and fraud at scale with an agentic AI platform.

Server-side bot and agent management platform that identifies humans, good bots, bad bots, and AI agents before traffic lands.

Keycard provides secure, digital identity and access management solutions for businesses, specifically for AI agents.

Truffle Security provides a platform for continuous security testing and vulnerability management.

Financial fraud prevention platform combating authorized push payment fraud for banks.

Unified platform for continuous application security, fusing SAST, SCA, secrets scanning, IaC scanning, and pentesting into a single, exploit-validated record per vulnerability.

Secure, identity-based connectivity platform replacing VPNs, SASE, and PAM for modern teams and workloads.

ShieldSquare provides a bot mitigation and management solution to protect online businesses from automated threats and fraud.

AppSec platform with built-in ASPM for unified security, development, and operations.

Developer-first security platform providing continuous AI-driven penetration testing and vulnerability remediation.

Cybersecurity threat intelligence and security operations platform.

Real-time threat intelligence platform.

Radware Bot Manager offers AI-powered, real-time bot protection for web, mobile, and APIs.

AI-powered platform for mobile threat intelligence and fraud prevention.

Cybersecurity startup focused on identity and access management solutions.

Agentic endpoint security for AI coding, providing visibility, governance, and real-time protection.

AI-native defense platform for software development.

Kasada protects websites, mobile apps, and APIs from automated attacks with real-time threat detection.

Behavioral biometrics platform that analyzes human-device interaction patterns to detect fraud and authenticate users.

Comprehensive LLM cybersecurity startup addressing evolving threats across business touchpoints.

AI-powered cybersecurity training platform using CyberGPT for phishing simulation and threat defense.

Adaptive edge security management to optimize existing Web Application Firewalls (WAFs).

Cyber insurance and risk mitigation platform for SMEs in Europe.

Agentic identity security team using AI agents to investigate and remediate access risks.

Building the secure control layer for enterprise AI agents.

AI-powered security solutions for large language models.

Automated API security testing to proactively identify and eliminate complex application security risks.

Cybersecurity platform for third-party risk management and supply chain security.

Design-led product security solutions for the AI era, automating security design reviews.

Darkid provides edge-native device recognition for first-party account security, fraud, and abuse prevention without logins or cookies.

Imperva is a cybersecurity leader protecting critical applications, APIs, and data for organizations globally with an integrated security approach.

AI-powered cybersecurity agents for proactive threat detection and response.

An AI-native cybersecurity platform that protects organizations from AI-driven cyberattacks using deception technology and autonomous response.

Security startup using AI and VoIP to combat fraud and identity theft.

Transmit Security provides a customer identity and access management (CIAM) platform for secure and frictionless digital identity journeys.

QIZ Security helps organizations manage cryptographic risk by providing visibility, automation, context, and actionable insights into their cryptographic layer, ensuring adaptability to emerging security demands.

Cybersecurity solutions provider focused on vulnerability management, detection, and response.

dWallet Labs is a cybersecurity and blockchain startup focused on securing digital assets.

Global cybersecurity leader providing AI-powered, cloud-delivered security solutions for enterprises and governments.

Securely stores and manages passwords, secrets, and access for individuals, businesses, and AI agents.

AI-powered authentication and authorization platform for secure access.

F5's cloud-native solution for detecting and mitigating sophisticated bot attacks across web and mobile applications.

Ent is the Intent-Aware Workspace Security Platform that protects work as it happens. It reads human, AI, and application activity in real time and steps in at the moment of risk, not days later.

Measures quantum-decryption risk to sensitive data with its Decryption Blast Radius score.

Ossprey develops software supply chain security technology that helps organizations detect malicious code hidden within open-source software packages before it reaches production environments.

AI-powered bot protection and fraud prevention for websites and mobile applications.

Mobile app security and API protection platform for preventing fraud and abuse.

Pando Cyber Security provides a unified platform for enterprise cybersecurity risk management and compliance.

Machine identity protection platform for securing machine-to-machine communication and applications.

Cloud security platform identifying and removing critical risks across AWS, Azure, GCP, and Kubernetes.

Device intelligence platform for fraud prevention, bot detection, and enhanced customer experiences.

Authentication and authorization for modern apps.

AI-powered platform for proactive threat intelligence and risk management.

AI-powered platform for secure and compliant software development and deployment.

AI-powered platform for managing and mitigating software supply chain risks.

Verify JWT signatures with OpenID discovery and JWKS support for various algorithms.

The all-in-one security platform for the Solana ecosystem, scanning programs, hiring verified auditors, and earning bounties.