Onyx Platform vs Repello MCP Gateway: Side-by-Side Comparison (2026)

Onyx Platform: AI control plane for enterprise AI agent security, governance, and observability. built by Onyx Security. Core capabilities include Real-time AI agent activity monitoring across LLMs and frameworks, Session replay and audit trail for compliance and forensics, Shadow AI and unapproved model deployment detection..

Repello MCP Gateway: Security gateway for monitoring and protecting MCP-based AI agent tool calls. built by Repello AI. Core capabilities include Prompt injection detection and blocking, Tool poisoning attack detection, MCP traffic inspection and filtering..

Both serve the Agentic AI Security market but differ in approach, feature depth, and target audience.

Onyx Platform differentiates with Real-time AI agent activity monitoring across LLMs and frameworks, Session replay and audit trail for compliance and forensics, Shadow AI and unapproved model deployment detection. Repello MCP Gateway differentiates with Prompt injection detection and blocking, Tool poisoning attack detection, MCP traffic inspection and filtering.

Onyx Platform is developed by Onyx Security. Repello MCP Gateway is developed by Repello AI. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Onyx Platform and Repello MCP Gateway serve similar Agentic AI Security use cases: both are Agentic AI Security tools, both cover MCP Security. Review the feature comparison above to determine which fits your requirements.