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Freemium

Fiddler AI

An AI Control Plane for enterprise agent fleets – real-time guardrails under 80ms latency, 99% precision jailbreak blocking, and continuous evaluation through production.

3.8 Good 3.8
In-environment evaluation avoids sending sensitive data to external LLM APIs Enterprise plan pricing isn't published – requires a sales conversation
Reviewed by Challenging Voice Editorial · Updated Aug 2026 How we rate
PricingFree
Free planYes
CompanyFiddler AI
PlatformsWeb
CategoryAI Infrastructure & Agent Tooling
Last reviewedAug 2026

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Overview

Fiddler AI provides an AI Control Plane for managing enterprise agent workforces: Agentic Observability gives end-to-end visibility across an agent’s entire lifecycle, real-time policy enforcement applies guardrails at under 80ms latency, and Continuous Evaluations test agent behavior from development through production rather than only at launch.

In-environment evaluation, rather than routing every check through an external foundation-model API call, is the specific technical choice worth noting – Fiddler’s proprietary Centor Models handle evaluation locally, which the company claims cuts evaluation costs by up to 98% compared to external LLM calls while also keeping sensitive data in-environment. Combined with inline PII/PHI/secrets detection and redaction plus 99% precision jailbreak blocking, this is built for organizations that need both performance and compliance guarantees around their agent deployments, not just monitoring dashboards.

Fiddler serves Fortune 100 organizations across financial services, healthcare, insurance, and government – sectors where agent governance and audit trails aren’t optional. A free plan includes real-time guardrails powered by Centor Models; the Developer plan runs $0.002 per trace with observability and custom evaluators added; Enterprise offers flexible deployment (SaaS, VPC, on-premises) with custom pricing.

Key features

  • AI Control Plane for enterprise agent workforce management
  • Real-time guardrails and policy enforcement (<80ms latency)
  • In-environment Centor Models cut evaluation costs up to 98%
  • Inline PII/PHI/secrets detection and redaction
  • 99% precision jailbreak blocking

Screenshots & demo

Fiddler AI screenshot 1

Pricing

Fiddler AI offers a free plan, with paid upgrades for higher limits and more features.

  • Pricing modelFreemium
  • Starting priceFree
  • Free planYes
Visit Fiddler AI

Pricing is provided as a guide. Check the official site for the latest plans.

Is Fiddler AI expensive?

Fiddler AI has no advertised paid tier. Among the 75 priced tools we list in AI Infrastructure & Agent Tooling, the median entry price is $29 a month.

54% of AI Infrastructure & Agent Tooling tools in the directory offer a free tier, and this is one of them.

Compared against every priced listing in AI Infrastructure & Agent Tooling, recalculated as the catalogue changes. Method and the full market breakdown are in our AI tool pricing study.

Pros & cons

Pros

  • In-environment evaluation avoids sending sensitive data to external LLM APIs
  • Free plan includes real guardrail functionality, not just a limited trial
  • Built for regulated industries with genuine compliance/audit needs

Cons

  • Enterprise plan pricing isn't published – requires a sales conversation
  • Full value depends on operating a real fleet of AI agents in production
  • Developer-plan per-trace pricing could scale unpredictably with usage

How it compares

ToolRatingFreeFromBest known for
Fiddler AI (this tool)3.8YesFreeAI Control Plane for enterprise agent workforce management
Qualifire4.0No—Contextual guardrails enforced in real time
ChatBotKit3.6YesFreeMulti-step autonomous agent reasoning and execution
Lyzr Agent Studio4.1Yes$19/moAgent Studio for building and orchestrating multi-agent workflows

Alternatives to Fiddler AI

4 tools matched to Fiddler AI on what they do, their category and their price.

ChatBotKit

3.6

Build production AI agents that reason, plan and execute multi-step tasks – resolving tickets, qualifying leads, processing documents – with MCP tool-calling, RAG knowledge bases, and built-in content-moderation guardrails.

Frequently asked questions

Featured in our guides

What is Fiddler AI?
Fiddler AI is an ai infrastructure & agent tooling tool. An AI Control Plane for enterprise agent fleets – real-time guardrails under 80ms latency, 99% precision jailbreak blocking, and continuous evaluation through production.
Is Fiddler AI free?
Yes, Fiddler AI offers a free plan. Paid plans unlock more features and higher usage limits.
What are the best Fiddler AI alternatives?
The closest matches in the directory are Qualifire, ChatBotKit, and Lyzr Agent Studio, compared side by side above.

Reviews

3.8 Editorial rating No reviews yet

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