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Head-to-head · AI Guardrail Software

Fiddler Guardrails vs Openlayer Guardrails

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Fiddler Guardrails #9 in AI Guardrail Software 8.2/10 Free plan Free plan✓ 4 of 4 features Visit Fiddler
Openlayer Guardrails #10 in AI Guardrail Software 8.1/10 Free plan Free plan✓ 4 of 4 features Visit Openlayer

Fiddler Guardrails leads on 0 checks, Openlayer Guardrails 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 scoreFiddler Guardrails · 8.2/10
  • Free planboth

Fiddler Guardrails scores higher on our rubric for ai guardrail software: 8.2 against 8.1 out of 10; our editors rank them #9 and #10.

Fiddler Guardrails is the better fit for teams needing affordable runtime evaluation. Openlayer Guardrails is the better fit for teams wanting free runtime safety enforcement.

  • Fiddler Guardrails fits best

    Teams needing affordable runtime evaluation

  • Openlayer Guardrails fits best

    Teams wanting free runtime safety enforcement

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Side by side

Feature Fiddler Guardrails 8.2/10 Visit ↗ Openlayer Guardrails 8.1/10 Visit ↗
At a glance
Editor score 8.2 8.1
Ranking #9 in AI Guardrail Software #10 in AI Guardrail Software
Best for Teams needing affordable runtime evaluation Teams wanting free runtime safety enforcement
Pricing model Free plan + paid Free plan + paid
Starting price $0.002/unit usage-based —
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Docs Community, Live chat, Docs
Compliance SOC 2, HIPAA, SSO/SAML SOC 2, GDPR, HIPAA, SSO/SAML, 2FA
Integrations 4 integrations 2 integrations
Built for Enterprise Mid-market, Enterprise
Features Fiddler Guardrails 4/4 · Openlayer Guardrails 4/4
Prompt injection defense ✓ ✓
PII detection ✓ ✓
Jailbreak detection ✓ ✓
Custom policies ✓ ✓
Specs
Deployment Hybrid Hybrid
SDK languages Python, Node.js Python, TypeScript, Go, Ruby, Java
Our review
Pros
  • Free real-time guardrails cover hallucinations, toxicity, PII/PHI, and jailbreaks
  • $0.002-per-trace Developer pricing adds observability and custom evaluators
  • Supports allow, block, or redact actions with configurable policy thresholds
  • Blocks prompt injection, jailbreaks, PII, PHI, and harmful content
  • Supports Gateway and SDK enforcement across multiple deployment models
  • Records policy decisions as audit evidence for enforcement actions
Cons
  • Enterprise pricing requires contacting the vendor
  • Gateway integrations center on four listed frameworks
  • Advanced deployment options are concentrated in the Enterprise plan
  • Enterprise-only features include SAML SSO, RBAC, and on-premise deployment
  • Basic support is community-based
  • Named integrations focus on LangChain and LangGraph
Our verdict

Fiddler Guardrails is a runtime policy enforcement layer for AI agents and LLM applications. It evaluates prompts and responses for prompt injection, jailbreaks, unsafe content, hallucinations, PII, and PHI, then applies configured allow,…

Read the review →

Openlayer Guardrails provides runtime protection for AI applications by inspecting inputs and outputs as they pass through Openlayer. It is aimed at engineering, security, compliance, and AI teams running production systems across…

Read the review →
  1. Fiddler GuardrailsAI Guardrail Software 8.2Free plan
  2. Openlayer GuardrailsAI Guardrail Software 8.1Free plan

Strengths and trade-offs

  • Fiddler Guardrails — where it wins

    • Free real-time guardrails cover hallucinations, toxicity, PII/PHI, and jailbreaks
    • $0.002-per-trace Developer pricing adds observability and custom evaluators
    • Supports allow, block, or redact actions with configurable policy thresholds

    Where it doesn't

    • Enterprise pricing requires contacting the vendor
    • Gateway integrations center on four listed frameworks
    • Advanced deployment options are concentrated in the Enterprise plan

  • Openlayer Guardrails — where it wins

    • Blocks prompt injection, jailbreaks, PII, PHI, and harmful content
    • Supports Gateway and SDK enforcement across multiple deployment models
    • Records policy decisions as audit evidence for enforcement actions

    Where it doesn't

    • Enterprise-only features include SAML SSO, RBAC, and on-premise deployment
    • Basic support is community-based
    • Named integrations focus on LangChain and LangGraph
  • Fiddler Guardrails8.2/10 · Free plan

    Affordable runtime evaluation with policy enforcement, detection, and gateway integrations.

    Visit FiddlerFull verdict →
  • Openlayer Guardrails8.1/10 · Free plan

    Runtime inspection and enforcement for teams protecting production AI applications.

    Visit OpenlayerFull verdict →

All AI guardrail software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update