FilterPrompt — AI Firewall for LLM Applications
FilterPrompt is a drop-in AI firewall proxy for LLM apps. It inspects every prompt and response across OpenAI, Anthropic, Google Gemini, Azure OpenAI, and any OpenAI-compatible endpoint to block prompt injection, redact PII, stop jailbreaks, and enforce per-tenant policy in real time. This page is a non-JavaScript fallback — open the site in a modern browser to load the full application, or follow the links below to read the per-page content.
Explore FilterPrompt
- What is an AI firewall? — category overview and threat model.
- Prompt injection protection — direct, indirect, and tool-call defenses.
- LLM PII redaction & DLP — inbound and outbound data loss prevention.
- Multi-tenant AI gateway — for SaaS platforms shipping LLM features.
- OWASP LLM Top 10 coverage — every risk mapped to a control.
- AI firewall comparison — FilterPrompt vs Lakera, Cloudflare, PromptShield, Akamai, F5.
- How it works — the Prompt Filter Engine pipeline.
- Benchmark methodology — how we measure detection accuracy.
- About FilterPrompt
From the FilterPrompt blog
- All articles
- Prompt Injection 101: Direct, Indirect & How to Defend
- PII & DLP for LLMs: A Practical Redaction Playbook
- Designing a Multi-Tenant AI Gateway
- From Zero to Secured GPT in 10 Minutes
- Inside the Prompt Filter Engine — Layered Detection Explained
- OWASP LLM Top 10 — Mapped to Firewall Rules
- Prompt Firewall Tutorial: Build Production LLM Security in One Afternoon
- How to Implement an LLM Firewall: A Step-by-Step Guide
- Prompt Injection Prevention Techniques That Actually Work in 2025
- AI Firewall Comparison Guide
- Best Practices for LLM Security
- Free LLM Security Tools: An Honest 2025 Roundup
- Open Source Prompt Firewall Options
- Prompt Firewall vs AI Gateway
- AI Firewall for Startups
- The 2025 LLM Security Checklist
- Lakera vs Cloudflare Firewall for AI vs FilterPrompt
- LLM Firewall for RAG Applications