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Head-to-head · LLM Security Tools

Guardrails AI vs PromptGuard

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Guardrails AI #1 in LLM Security Tools 9.3/10 Open source ✓ 4 of 5 features Visit Guardrails AI
PromptGuard #5 in LLM Security Tools 8.9/10 Free plan Free plan✓ 0 of 5 features Visit PromptGuard

Guardrails AI 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 scoreGuardrails AI · 9.3/10
  • Free planonly PromptGuard
  • Most featuresGuardrails AI · 4 of 5

Guardrails AI scores higher on our rubric for llm security tools: 9.3 against 8.9 out of 10; our editors rank them #1 and #5.

Guardrails AI is the better fit for open-source runtime validation and policy enforcement. PromptGuard is the better fit for affordable teams needing LLM red teaming.

  • Guardrails AI fits best

    Open-source runtime validation and policy enforcement

  • PromptGuard fits best

    Affordable teams needing LLM red teaming

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Side by side

Feature Guardrails AI 9.3/10 Visit ↗ PromptGuard 8.9/10 Visit ↗
At a glance
Editor score 9.3 8.9
Ranking #1 in LLM Security Tools #5 in LLM Security Tools
Best for Open-source runtime validation and policy enforcement 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 Cloud, Self-hosted Cloud, Self-hosted, Desktop, Browser extension
Platforms Web Web, Windows, macOS, Chrome extension
Support Community, Docs Email, Community, Docs
Compliance SOC 2 GDPR, SSO/SAML
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Guardrails AI 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 Hybrid Not checked yet
Our review
Pros
  • Covers PII, prompt injection, jailbreaks, secrets, and hallucinations
  • Supports runtime validation for both LLM inputs and outputs
  • Runs in cloud or on-premises environments with customizable validators
  • 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
  • Validator selection and customization require policy-design work
  • Guardrails Pro is a separate offering for centralized management
  • Its focus is runtime governance rather than broader model development
  • 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

Guardrails AI is an open-source framework for building, governing, and scaling production generative-AI applications across LLMs and deployment environments. It is designed for developers who need runtime controls around model…

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. Guardrails AILLM Security Tools 9.3Open source
  2. PromptGuardLLM Security Tools 8.9Free plan

Strengths and trade-offs

  • Guardrails AI — where it wins

    • Covers PII, prompt injection, jailbreaks, secrets, and hallucinations
    • Supports runtime validation for both LLM inputs and outputs
    • Runs in cloud or on-premises environments with customizable validators

    Where it doesn't

    • Validator selection and customization require policy-design work
    • Guardrails Pro is a separate offering for centralized management
    • Its focus is runtime governance rather than broader model development

  • 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