Comparisons that start from LLM Guard, the open-source toolkit of input and output scanners for LLM applications, against other runtime guardrail libraries.
Security scanners against structured output validation: LLM Guard and Guardrails AI compared on prompt injection and data leakage detection, validator ecosystems, hosted versus self-run components, licenses and where each fits in an LLM request path.
Replacing LLM Guard's prompt and response scanners after Protect AI archived it in July 2026: what LlamaFirewall's PromptGuard 2, CodeShield and regex scanners cover, what has no direct equivalent, and how to plan the switch.
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