cside is a cybersecurity company that focuses on client-side security through its platform, Gatekeeper. This platform protects websites from browser-based attacks, script compromises, and supply chain threats by monitoring and blocking malicious third-party scripts in real-time. Founded by experienced security engineers, cside operates as a fully remote team dedicated to enhancing client-side security for businesses of all sizes. Gatekeeper features a hybrid proxy and agent system that inspects third-party scripts before execution, providing dynamic threat detection and real-time blocking of malicious code. The platform also offers a unified dashboard for management, script inventory, and integration with identity providers. cside emphasizes accessibility with transparent pricing, self-service onboarding, and robust customer support via Slack and Microsoft Teams. The company is compliant with various security frameworks and has recently expanded its offerings through AWS Marketplace and a partner program for resellers.