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Head-to-head · LLM Security Tools

PromptGuard vs ZeroTrusted AI Firewall

  • Updated Sep 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score PromptGuard #5 in LLM Security Tools 7.1/10 Free plan · paid from $19/user/mo Free plan✓ 0 of 5 features Visit PromptGuard
ZeroTrusted AI Firewall #6 in LLM Security Tools 7.0/10 Pricing on request · 15-day trial ✓ 5 of 5 features Visit ZeroTrusted.ai

PromptGuard leads on 1 check, ZeroTrusted AI Firewall on 5, and 0 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 scorePromptGuard · 7.1/10
  • Free planonly PromptGuard
  • Most featuresZeroTrusted AI Firewall · 5 of 5

PromptGuard scores higher on our rubric for llm security tools: 7.1 against 7.0 out of 10; our editors rank them #5 and #6.

PromptGuard offers free plan; ZeroTrusted AI Firewall doesn't. ZeroTrusted AI Firewall offers prompt injection defense; PromptGuard doesn't publish it. ZeroTrusted AI Firewall offers pii redaction; PromptGuard doesn't publish it. ZeroTrusted AI Firewall offers secrets detection; PromptGuard doesn't publish it. ZeroTrusted AI Firewall offers output guardrails; PromptGuard doesn't publish it.

PromptGuard is the better fit for affordable teams needing LLM red teaming. ZeroTrusted AI Firewall is the better fit for security teams needing broad inline AI protection.

  • PromptGuard fits best

    Affordable teams needing LLM red teaming

  • 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 PromptGuard 7.1/10 Visit ↗ ZeroTrusted AI Firewall 7.0/10 Visit ↗
At a glance
Editor score 7.1 7.0
Ranking #5 in LLM Security Tools #6 in LLM Security Tools
Best for Affordable teams needing LLM red teaming Security teams needing broad inline AI protection
Pricing model Free plan + paid Paid
Starting price Not published Not published
Free plan ✓ (best) —
Free trial — —
Deployment Cloud, Self-hosted, Desktop, Browser extension Cloud, Self-hosted, Browser extension
Platforms Web, Windows, macOS, Chrome extension Web
Compliance GDPR, SSO/SAML SOC 2, ISO 27001, GDPR, HIPAA, PCI DSS
Built for Small business, Mid-market, Enterprise Mid-market, Enterprise
Features PromptGuard 0/5 · ZeroTrusted AI Firewall 5/5
Prompt injection defense Not published ✓ (best)
PII redaction Not published ✓ (best)
Secrets detection Not published ✓ (best)
Output guardrails Not published ✓ (best)
Model-abuse detection Not published ✓ (best)
Specs
Deployment model Not published Hybrid
Our review
Pros
  • 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
  • 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 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
  • Custom enterprise pricing can make budgeting less direct
  • No free plan is available
  • The published offering centers on one Enterprise plan
Our verdict

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 →

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. PromptGuardLLM Security Tools 7.1Free plan · paid from $19/user/mo
  2. ZeroTrusted AI FirewallLLM Security Tools 7.0Pricing on request · 15-day trial

Strengths and trade-offs

  • 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

  • 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