Fiddler Guardrails

7.0easy start · #4 of 21
in AI Guardrail Software

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on api, self-hosted, Web.

Fiddler Guardrails is ranked #4 of 21 in AI guardrail software on The Geeks Club. It runs on API, Self-hosted, Web. There is a free plan.

Fiddler Guardrails plans and pricing

All plans

Free Free Real-time guardrails to detect harmful exposure · Protects against hallucinations, toxicity, PII/PHI, prompt injection, and jailbreak attempts · <80ms latency fiddler.ai · 30 Sept 2026

Developer Free per trace Everything in Free · Unified AI observability, including tests and experiments · Custom evaluators and bring your own judge · Role based access control and SSO · SaaS deployment fiddler.ai · 30 Sept 2026

Enterprise Not published Everything in Developer · Enterprise-grade guardrails and infrastructure scalability · SaaS, VPC, or on-premise deployment · Dedicated communication channels · Named Customer Success Manager and customized onboarding fiddler.ai · 30 Sept 2026

Compared on AI guardrail software

Free plan: Yes
Deployment: hybrid
Prompt injection defense: Yes
PII detection: Yes
Jailbreak detection: Yes
Custom policies: Yes
SDK languages: Python, Node.js

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The record

Purpose: Fiddler Guardrails is a runtime policy enforcement layer for agentic AI that evaluates prompts and responses against safety, security, privacy, and accuracy policies.
Latency: Fiddler states Guardrails enforces policies at runtime in under 80ms.
Deployment and data: Fiddler says its Centor Models run in customer cloud and VPC environments, with zero data egress from the customer environment.
Safety coverage: Safety policies block harmful, inappropriate, and malicious content and cover metrics including jailbreaks, harassment, hate, illegal content, and violence.
Privacy coverage: Privacy and compliance policies detect 35+ PII entities and healthcare specific entity types for HIPAA compliance, including API keys, payment card numbers, dates of birth, and medical record numbers.
Accuracy coverage: Faithfulness policies check whether responses are grounded in provided context to prevent misleading output.
Integration: Fiddler lists an out-of-the-box integration with NVIDIA NeMo Guardrails.
API and languages: Guardrails is accessed through an API, with code examples for NodeJS, Python, cURL, or any HTTP library.
Security controls: Fiddler says customer data is encrypted at rest with AES-256 or higher and communications use HTTPS/TLS 1.2 or higher.
Compliance: Fiddler states it is SOC 2 Type II audited annually and HIPAA compliant.
Support: Enterprise pricing includes white glove support with dedicated communication channels and a named Customer Success Manager.
Availability: The documentation describes Guardrails as part of the Fiddler AI Observability and Security platform, accessed in a Fiddler environment using a REST API and API key.
Founded: 2018
Headquarters: Palo Alto, California, United States
Price from: Free

Where it ranks on The Geeks Club

Best AI Guardrail Software in 2026#4 of 21

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Sources

fiddler.ai/guardrails· checked 30 Sept 2026
fiddler.ai/security· checked 30 Sept 2026
fiddler.ai/pricing· checked 30 Sept 2026
docs.fiddler.ai/getting-started/guardrails· checked 30 Sept 2026