Promptbrake

PromptBrake is a security testing platform for LLM-powered API endpoints that detects prompt injection, data leaks, and unsafe tool behavior through automated scans. The platform tests for system prompt leaks, cross-user data exposure, indirect prompt injection via external content, policy confusion, multi-turn escalation, and function call injection. PromptBrake works with OpenAI, Claude, Gemini, and compatible API endpoints, delivering PASS/WARN/FAIL results with evidence and remediation guidance for each vulnerability. Every scan runs against a dev or staging API key that is not stored, and no credit card is required. The tool is designed for founders, product managers, engineers, and operators who need security validation before shipping AI features. PromptBrake is free to use and provides clear evidence and retesting workflows for identified issues.