Splunk Guardrails vs Fiddler Guardrails

Splunk Guardrails8.3Visit Fiddler Guardrails8.2Visit

Higher score Splunk Guardrails #8 in AI Guardrail Software 8.3/10 Free plan Free plan✓ 3 of 4 features Visit Splunk

vs

Fiddler Guardrails #9 in AI Guardrail Software 8.2/10 Free plan Free plan✓ 4 of 4 features Visit Fiddler

• Splunk Guardrails fits best

  Framework-agnostic enterprise agent governance

• Fiddler Guardrails fits best

  Teams needing affordable runtime evaluation

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Side by side

Feature	Splunk Guardrails 8.3/10 Visit ↗	Fiddler Guardrails 8.2/10 Visit ↗
At a glance
Editor score	8.3	8.2
Ranking	#8 in AI Guardrail Software	#9 in AI Guardrail Software
Best for	Framework-agnostic enterprise agent governance	Teams needing affordable runtime evaluation
Pricing model	Free plan + paid	Free plan + paid
Starting price	$100/unit/mo	$0.002/unit usage-based
Free plan	✓	✓
Free trial	—	—
Deployment	Cloud, Self-hosted	Cloud, Self-hosted
Platforms	Web	Web
Support	Docs	Docs
Integrations	10 integrations	4 integrations
Built for	Mid-market, Enterprise	Enterprise
Features Splunk Guardrails 3/4 · Fiddler Guardrails 4/4
Prompt injection defense	✓	✓
PII detection	✓	✓
Jailbreak detection	Not checked yet	✓ (best)
Custom policies	✓	✓
Specs
Deployment	Hybrid	Hybrid
SDK languages	Python	Python, Node.js
Our review
Pros	Blocks prompt injection, PII, PHI, PCI leakage, and tool misuse Supports VPC, on-premises, and air-gapped deployment Integrates with major agent SDKs and frameworks	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
Cons	Paid access starts at $100 per month with annual billing Pricing is presented under Splunk Agent Observability Python is the listed SDK language	Enterprise pricing requires contacting the vendor Gateway integrations center on four listed frameworks Advanced deployment options are concentrated in the Enterprise plan
Our verdict	Splunk Guardrails provides runtime controls for AI agents and generative AI applications. It evaluates proposed actions between an agent and its tools, then allows, blocks, or redirects them according to configured policies. The product is… Read the review →	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 →

Strengths and trade-offs

• Splunk Guardrails — where it wins

  • Blocks prompt injection, PII, PHI, PCI leakage, and tool misuse
  • Supports VPC, on-premises, and air-gapped deployment
  • Integrates with major agent SDKs and frameworks

  Where it doesn't

  • Paid access starts at $100 per month with annual billing
  • Pricing is presented under Splunk Agent Observability
  • Python is the listed SDK language

• 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

• Splunk Guardrails8.3/10 · Free plan

  A framework-agnostic control plane for evaluating and blocking risky agent actions.

  Visit SplunkFull verdict →
• Fiddler Guardrails8.2/10 · Free plan

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

  Visit FiddlerFull verdict →