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Head-to-head · LLM Security Tools

LLM Guard vs ZeroTrusted AI Firewall

  • Updated Sep 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score LLM Guard #2 in LLM Security Tools 8.2/10 Open source ✓ 4 of 5 features Visit LLM Guard
ZeroTrusted AI Firewall #6 in LLM Security Tools 7.0/10 Pricing on request · 15-day trial ✓ 5 of 5 features Visit ZeroTrusted.ai

LLM Guard leads on 0 checks, ZeroTrusted AI Firewall on 1, and 5 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreLLM Guard · 8.2/10
  • Most featuresZeroTrusted AI Firewall · 5 of 5

LLM Guard scores higher on our rubric for llm security tools: 8.2 against 7.0 out of 10; our editors rank them #2 and #6.

ZeroTrusted AI Firewall offers model-abuse detection; LLM Guard doesn't publish it. On deployment model, ZeroTrusted AI Firewall gives you Hybrid where LLM Guard offers Self-hosted.

LLM Guard is the better fit for self-hosted prompt and output scanning. ZeroTrusted AI Firewall is the better fit for security teams needing broad inline AI protection.

  • LLM Guard fits best

    Self-hosted prompt and output scanning

  • ZeroTrusted AI Firewall fits best

    Security teams needing broad inline AI protection

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. How we rank.

Side by side

Feature LLM Guard 8.2/10 Visit ↗ ZeroTrusted AI Firewall 7.0/10 Visit ↗
At a glance
Editor score 8.2 7.0
Ranking #2 in LLM Security Tools #6 in LLM Security Tools
Best for Self-hosted prompt and output scanning Security teams needing broad inline AI protection
Pricing model Free Paid
Starting price Not published Not published
Free plan Not published —
Free trial — —
Deployment Self-hosted Cloud, Self-hosted, Browser extension
Built for Small business, Mid-market, Enterprise Mid-market, Enterprise
Features LLM Guard 4/5 · ZeroTrusted AI Firewall 5/5
Prompt injection defense ✓ ✓
PII redaction ✓ ✓
Secrets detection ✓ ✓
Output guardrails ✓ ✓
Model-abuse detection Not published ✓ (best)
Specs
Deployment model Self-hosted Hybrid
Our review
Pros
  • Detects direct and indirect prompt injection attempts
  • Redacts PII, API tokens, private keys, and high-entropy strings
  • Integrates with OpenAI, LangChain, LlamaIndex, and LiteLLM
  • Inspects prompts, responses, and tool calls with policy rules
  • Redacts PII, PHI, classified data, and secrets
  • Supports SaaS, on-premises, air-gapped, and multi-cloud deployment
Cons
  • The project and associated models were archived on July 9, 2026
  • No longer under active development or maintenance
  • Requires self-hosted deployment through a local API or Docker
  • Custom enterprise pricing can make budgeting less direct
  • No free plan is available
  • The published offering centers on one Enterprise plan
Our verdict

LLM Guard is an open-source Python toolkit from Protect AI for securing applications that use large language models. It is designed for teams and developers who need self-hosted scanning of prompts and model outputs rather than a hosted…

Read the review →

ZeroTrusted AI Firewall is an AI security layer for organizations operating LLMs, agents, and AI APIs. It inspects prompts, model responses, and tool calls in real time, with controls for prompt injection, jailbreaks, data exfiltration,…

Read the review →
  1. LLM GuardLLM Security Tools 8.2Open source
  2. ZeroTrusted AI FirewallLLM Security Tools 7.0Pricing on request · 15-day trial

Strengths and trade-offs

  • LLM Guard — where it wins

    • Detects direct and indirect prompt injection attempts
    • Redacts PII, API tokens, private keys, and high-entropy strings
    • Integrates with OpenAI, LangChain, LlamaIndex, and LiteLLM

    Where it doesn't

    • The project and associated models were archived on July 9, 2026
    • No longer under active development or maintenance
    • Requires self-hosted deployment through a local API or Docker

  • ZeroTrusted AI Firewall — where it wins

    • Inspects prompts, responses, and tool calls with policy rules
    • Redacts PII, PHI, classified data, and secrets
    • Supports SaaS, on-premises, air-gapped, and multi-cloud deployment

    Where it doesn't

    • Custom enterprise pricing can make budgeting less direct
    • No free plan is available
    • The published offering centers on one Enterprise plan

More comparisons

All LLM security tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

Last updated · How we research and update