Tool Comparison

LLM Guard vs AI Privacy Gateway

LLM Guard vs AI Privacy Gateway — an in-depth comparison to help you choose the right AI data privacy tool for your stack.

TL;DR: LLM Guard — Open-source security toolkit for LLM interactions. AI Privacy Gateway takes a different approach: a standalone proxy that masks PII at the network layer, requiring zero code changes and keeping data 100% local.

About LLM Guard

LLM Guard is an open-source Python library that provides input/output sanitization, PII detection, and prompt injection detection for LLM applications.

What LLM Guard Does Well

Strengths

  • Comprehensive sanitization features (PII, prompt injection, toxicity)
  • Open source with active community
  • Well-documented Python API

Limitations

  • Library-only — no standalone proxy or gateway
  • Requires code changes to integrate
  • Python-only — no cross-language SDK

Detailed Comparison: LLM Guard vs AI Privacy Gateway

Dimension LLM Guard AI Privacy Gateway
Architecture Python library (require code integration) Standalone proxy (no code changes)
Integration pip install + add to code 30-second Docker deploy, change base URL
Performance Python-based detection Rust engine — 10x faster
PII Entities Standard Western formats 14+ types with Chinese ID, phone formats
License MIT MIT

Why Teams Choose AI Privacy Gateway Over LLM Guard

1

Zero Code Changes

Unlike LLM Guard's approach, AI Privacy Gateway works as a network proxy. Deploy the Docker container, change the API base URL — done in 30 seconds.

2

Data Never Leaves Your Infrastructure

All PII masking happens locally. Your data is never sent to a third-party cloud for processing. This is critical for GDPR, HIPAA, and PIPL compliance.

3

MIT Open Source

Full source code available. No vendor lock-in, no per-seat pricing, no usage limits. Deploy anywhere, audit everything.

4

14+ Entity Types

Comprehensive PII detection including phone numbers, emails, ID cards, bank cards, names, addresses, API keys, and Chinese-specific formats.

When LLM Guard Might Be the Better Choice

No tool is perfect for every situation. Here is when LLM Guard might make more sense:

However, if you need a self-hosted, open-source, zero-code-change solution that works across all your AI APIs, AI Privacy Gateway is the clear choice.

Try AI Privacy Gateway — Free and Open Source

Deploy in 30 seconds. Compare for yourself.

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Frequently Asked Questions

Is AI Privacy Gateway a replacement for LLM Guard?

It depends on your use case. AI Privacy Gateway is specifically designed for AI API privacy — masking PII before it reaches any LLM provider. If LLM Guard serves a broader or different purpose, they may be complementary rather than direct replacements.

Can I use both LLM Guard and AI Privacy Gateway together?

Yes. Many teams use multiple privacy tools for defense-in-depth. AI Privacy Gateway sits at the network layer, so it works alongside any other tool in your stack.

How does the performance compare?

AI Privacy Gateway adds less than 1ms latency per request (Rust-based detection engine). LLM Guard's performance characteristics depend on its architecture.