C3 vs Core Security Cobalt Strike: side-by-side comparison (2026)

C3: C3 is a framework by WithSecureLabs for rapid prototyping of custom command and control channels that integrates with existing offensive security toolkits.

Core Security Cobalt Strike: Post-exploitation threat emulation platform for red team operations. Built by Core Security.

The table above shows where their features, integrations, deployment and company size fit differ.

C3 is open-source with 1,735 GitHub stars. Core Security Cobalt Strike is made by Core Security. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Often, yes. C3 and Core Security Cobalt Strike are both Red-Team & Adversary Emulation products, and both cover Red Team, C2. Key differences: C3 is Free while Core Security Cobalt Strike is Commercial, C3 is open-source. Use the table above to see where features, deployment and company size fit differ.