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Head-to-head · LLM Security Tools

LLM Guard vs PromptGuard

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score LLM Guard #2 in LLM Security Tools 9.2/10 Open source ✓ 4 of 5 features Visit LLM Guard
PromptGuard #5 in LLM Security Tools 8.9/10 Free plan Free plan✓ 0 of 5 features Visit PromptGuard

LLM Guard leads on 0 checks, PromptGuard on 0, and 5 are even. Who comes out ahead on the 5 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 · 9.2/10
  • Free planonly PromptGuard
  • Most featuresLLM Guard · 4 of 5

LLM Guard scores higher on our rubric for llm security tools: 9.2 against 8.9 out of 10; our editors rank them #2 and #5.

LLM Guard is the better fit for self-hosted prompt and output scanning. PromptGuard is the better fit for affordable teams needing LLM red teaming.

  • LLM Guard fits best

    Self-hosted prompt and output scanning

  • PromptGuard fits best

    Affordable teams needing LLM red teaming

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Side by side

Feature LLM Guard 9.2/10 Visit ↗ PromptGuard 8.9/10 Visit ↗
At a glance
Editor score 9.2 8.9
Ranking #2 in LLM Security Tools #5 in LLM Security Tools
Best for Self-hosted prompt and output scanning Affordable teams needing LLM red teaming
Pricing model Free Free plan + paid
Starting price Open source $19/seat/mo
Free plan Not checked yet ✓ (best)
Free trial — —
Deployment Self-hosted Cloud, Self-hosted, Desktop, Browser extension
Support Email, Community, Docs Email, Community, Docs
Integrations 4 integrations 12 integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features LLM Guard 4/5 · PromptGuard 0/5
Prompt injection defense ✓ (best) Not checked yet
PII redaction ✓ (best) Not checked yet
Secrets detection ✓ (best) Not checked yet
Output guardrails ✓ (best) Not checked yet
Model-abuse detection Not checked yet Not checked yet
Specs
Deployment model Self-hosted Not checked yet
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
  • Automated assessments cover 20+ attack vectors and fuzzed variants
  • Integrates with OpenAI, Anthropic, Gemini, Bedrock, Mistral, and more
  • Supports CI/CD regression testing, API scanning, and tool-call validation
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
  • The Free plan includes only prompt injection and PII detection
  • Scale and Premium do not show prices in the published plan details
  • Advanced enterprise controls are concentrated in the 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 →

PromptGuard is an AI security platform for teams that need to test and protect LLM applications across development and production. It sits between applications and model providers, detecting prompt injection, jailbreak attempts, PII…

Read the review →
  1. LLM GuardLLM Security Tools 9.2Open source
  2. PromptGuardLLM Security Tools 8.9Free plan

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

  • PromptGuard — where it wins

    • Automated assessments cover 20+ attack vectors and fuzzed variants
    • Integrates with OpenAI, Anthropic, Gemini, Bedrock, Mistral, and more
    • Supports CI/CD regression testing, API scanning, and tool-call validation

    Where it doesn't

    • The Free plan includes only prompt injection and PII detection
    • Scale and Premium do not show prices in the published plan details
    • Advanced enterprise controls are concentrated in the Enterprise plan

More comparisons

All LLM security tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update