Doppel is the AI-native Social Engineering Defense platform, protecting organizations, their people, and their customers from phishing, deepfake attacks, brand and executive impersonation, online scams, and other social engineering threats. Powered by agentic AI and the Doppel Threat Graph, Doppel unifies Digital Risk Protection, Human Risk Management, and Email Security on one platform. It combines real-time threat intelligence, AI-powered detection, automated takedowns, email protection, and threat-informed security training to disrupt attacks across digital channels. By turning live threats into simulations and training, Doppel helps organizations strengthen both their technical defenses and employee resilience. Founded in 2022 and headquartered in San Francisco, Doppel announced a $70 million Series C in November 2025, bringing its total disclosed funding at the time to $124 million. Its investors include Bessemer Venture Partners, Andreessen Horowitz, CrowdStrike CEO George Kurtz, and MUFG Innovation Partners.