PromptShield is the only fully open-source, self-hosted security gateway for LLM applications. It catches SSNs, emails, credit cards, passwords, and API keys in real time with PII detection. Define security rules without touching code using simple YAML policies, and see exactly what's being blocked with real-time audit trails. Everything runs on Docker Compose in your own infrastructure. No SaaS, no third parties, no data leaving your systems.

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Hey Product Hunt! 👋 I built PromptShield because there's no real open-source, fully self-hosted security layer for LLMs. Sure, there are other tools but they're SaaS, they're closed, they want your data. You lock down your API, your database, your auth. The LLM? Just... open. So I built what I needed, a gateway that sits between your app and the model. Catches PII leaking. You write a YAML policy once, it works. No code changes. Everything stays on your infrastructure. That's it. That's the whole thing. If you ship LLMs to production and you're terrified about exactly what I'm terrified about and you don't want some third party touching your data, then this is for you. Upvote if you get it.