Tech riderRev. 30 Sept 2026

Fiddler Guardrails

Ch 047.0of 21 AI Guardrail Software

1Runs onAPI, self-hosted, Web
2CostsFree plan
3Deploymenthybrid
4Prompt injection defenseYes
5PII detectionYes
6Jailbreak detectionYes
7Custom policiesYes
8SDK languagesPython, Node.js

8 lines stated Written from the maker's own pages: fiddler.ai

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Overview

Fiddler Guardrails is ranked #4 of 21 in AI guardrail software on Specifiction. 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: Yesfiddler.ai
Deployment: hybridfiddler.ai
Prompt injection defense: Yesfiddler.ai
PII detection: Yesfiddler.ai
Jailbreak detection: Yesfiddler.ai
Custom policies: Yesfiddler.ai
SDK languages: Python, Node.jsfiddler.ai

Facts

Purpose: Fiddler Guardrails is a runtime policy enforcement layer for agentic AI that evaluates prompts and responses against safety, security, privacy, and accuracy policies.fiddler.ai · 30 Sept 2026
Latency: Fiddler states Guardrails enforces policies at runtime in under 80ms.fiddler.ai · 30 Sept 2026
Deployment and data: Fiddler says its Centor Models run in customer cloud and VPC environments, with zero data egress from the customer environment.fiddler.ai · 30 Sept 2026
Safety coverage: Safety policies block harmful, inappropriate, and malicious content and cover metrics including jailbreaks, harassment, hate, illegal content, and violence.fiddler.ai · 30 Sept 2026
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.fiddler.ai · 30 Sept 2026
Accuracy coverage: Faithfulness policies check whether responses are grounded in provided context to prevent misleading output.fiddler.ai · 30 Sept 2026
Integration: Fiddler lists an out-of-the-box integration with NVIDIA NeMo Guardrails.fiddler.ai · 30 Sept 2026
API and languages: Guardrails is accessed through an API, with code examples for NodeJS, Python, cURL, or any HTTP library.fiddler.ai · 30 Sept 2026
Security controls: Fiddler says customer data is encrypted at rest with AES-256 or higher and communications use HTTPS/TLS 1.2 or higher.fiddler.ai · 30 Sept 2026
Compliance: Fiddler states it is SOC 2 Type II audited annually and HIPAA compliant.fiddler.ai · 30 Sept 2026
Support: Enterprise pricing includes white glove support with dedicated communication channels and a named Customer Success Manager.fiddler.ai · 30 Sept 2026
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.docs.fiddler.ai · 30 Sept 2026