LUCID verifies AI-generated code using formal methods, not another LLM review. It extracts testable claims, checks them against specs, and produces fix plans. Reverse mode creates specifications before code generation to prevent hallucinations. Spec → Constrain → Generate → Verify 100% pass rate on HumanEval +65% improvement on SWE-bench (300 real GitHub bugs) 21 critical bugs found in 4 production apps Free tier available. Patent pending.