Castle
YC W16Block bots & bad behavior
San Francisco, CA, USA; RemoteFounded 201520 employeescastle.io
Team
20
Founded
2015
About
Instantly stop automated and human-originated account takeovers, fake accounts, and any behavior that violates your platform policies.
Tags
Developer Tools SaaS Security Fraud Detection Security
No open roles at this time.
Similar Security startups
AmberBox Gunshot Detection
Detect Gunshots | Inform Law Enforcement | Empower First Responders
Security
Open Jobs —
Team —
Founded 2020
Infisical
Unified platform for secrets, certs, and privileged access management
Developer ToolsSaaSB2B
Open Jobs 8
Team 50
Founded 2023
Better Auth
The authentication framework for TypeScript
Developer ToolsSecurityOpen Source
Open Jobs —
Team 4
Founded 2025
Cotool
AI Agents for Security Operations Teams
SaaSComplianceSecurity
Open Jobs —
Team 4
Founded 2025