CISO Tribune

Vendor comparison · 2 companies

Fiddler AI vs WitnessAI

Fiddler AI sells the AI Control Plane, a platform for first-party and third-party agents from the creation layer to production. WitnessAI sells an AI security and governance platform that brings humans and agents under one platform. CISO Tribune files both under AI governance and AI firewalls and guardrails. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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  • Fiddler AI
  • WitnessAI
Fiddler AI vs WitnessAI: Products, Customers and Funding Compared
Fiddler AIFiddler AI sells the AI Control Plane, a platform for first-party and third-party agents from the creation layer to production.fiddler.aiWitnessAIWitnessAI sells an AI security and governance platform that brings humans and agents under one platform.witness.ai
What it sells
  • Agentic Observability[2][4]Monitors every layer of the agentic hierarchy, from application health to agent interactions to individual spans.
  • ML Observability[2][5]Detects data and concept drift in predictive models and provides root cause analysis and fairness metrics.
  • Fiddler Centor Models[2][3][6]Power guardrails and evaluations in-environment, with no external LLM API calls.
  • Agent Registry[7]Lists every agent application in Fiddler, including first-party, third-party and coding agents.
  • Observe[6][11]Finds and catalogs AI applications, agents and MCP servers, and visualizes AI conversations and agentic activity.
  • Control[1][5][6][7][10][11]Governs what AI agents and employees can do, routes prompts to models based on risk or purpose, and generates audit trails.
  • Protect[1][5][6][8][11]Applies runtime security controls and content guardrails intended to block prompt injection and jailbreak attempts and filter harmful responses.
Categories
Headquarters
Not stated on its pagesMountain View, United States[4]
Founded
2018[1]2023[3]
Ownership and funding
Privately held[12]Privately held[2][13]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • January 27, 2026Fiddler AI announced a $30 million Series C funding round led by RPS Ventures.[1]
Not stated on its pages
G2 and Gartner Peer Insights
  • G2: listed, seen November 10, 2026[12]
  • Gartner Peer Insights: Not stated on its pages
  • G2: listed, seen November 10, 2026[13]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
From its own pages, Fiddler AI sells mainly to organizations deploying AI agents and predictive models, across all industries and in regulated industries such as financial services, healthcare, insurance and government. The typical users are software and AI engineers, data scientists, platform and DevOps teams, and security and compliance teams. Its pages address insurers, healthcare organizations and financial institutions deploying AI across underwriting, fraud and trading. Deployment options on the Enterprise plan are SaaS, VPC or on-premises.From its own pages, the company sells mainly to enterprises, saying they need security and governance that extends from humans to agents. It addresses employee use of AI, citing risks around sensitive data, compliance, and shadow AI. It also addresses AI agents, which it describes as connecting to tools, accessing data, and taking actions on behalf of employees.
Last verified
November 6, 2026November 2, 2026

Where they overlap

  • Fiddler AI and WitnessAI are both filed under AI governance and AI firewalls and guardrails.
  • Both are privately held.

Where they differ, field by field

  • Fiddler AI's primary category is AI model and agent security; WitnessAI's is Workforce AI usage security.
  • Fiddler AI lists Agentic Observability, ML Observability, Fiddler Centor Models and Agent Registry. WitnessAI lists Observe, Control and Protect.
  • WitnessAI is headquartered in Mountain View, United States.
  • Fiddler AI was founded in 2018. WitnessAI was founded in 2023.

What it sells: Fiddler AI

What Agentic Observability does[2][4]
Fiddler Agentic Observability monitors every layer of the agentic hierarchy from application health to agent interactions to individual spans. Fiddler gives aggregated and granular visibility from application to session to agent to trace to span.
What ML Observability does[2][5]
Fiddler ML Observability provides root cause analysis and fairness metrics such as disparate impact, demographic parity and equal opportunity. Fiddler tracks performance, drift, data integrity and model bias to observe and improve model health.
What Fiddler Centor Models does[2][3][6]
Fiddler Centor Models power guardrails and evaluations in-environment, with no external LLM API calls. Customers can choose Fiddler Centor Models that run in their environment, custom evaluators for domain-specific logic, or external judges for advanced reasoning.
What Agent Registry does[7]
Agent Registry lists every agent application in Fiddler, including first-party, third-party and coding agents. Fiddler records evaluation and policy outcomes with full traceability and generates audit evidence aligned with frameworks such as GDPR, HIPAA, NAIC, SR 11-7, NIST AI RMF, ISO/IEC 42001 and the EU AI Act.

Questions about Fiddler AI and WitnessAI

What do Fiddler AI and WitnessAI sell?
Fiddler AI sells Agentic Observability, ML Observability, Fiddler Centor Models and Agent Registry. WitnessAI sells Observe, Control and Protect.
Are Fiddler AI and WitnessAI in the same category?
They share AI governance and AI firewalls and guardrails. Fiddler AI's primary category is AI model and agent security and WitnessAI's is Workforce AI usage security.
Where are Fiddler AI and WitnessAI headquartered?
WitnessAI is headquartered in Mountain View, United States.
When were Fiddler AI and WitnessAI founded?
Fiddler AI was founded in 2018. WitnessAI was founded in 2023.
Who owns Fiddler AI and WitnessAI?
Fiddler AI is privately held. WitnessAI is privately held.
Who are Fiddler AI and WitnessAI sold to?
From its own pages, Fiddler AI sells mainly to organizations deploying AI agents and predictive models, across all industries and in regulated industries such as financial services, healthcare, insurance and government. From its own pages, the company sells mainly to enterprises, saying they need security and governance that extends from humans to agents.
What have Fiddler AI and WitnessAI announced recently?
January 27, 2026: Fiddler AI announced a $30 million Series C funding round led by RPS Ventures.

About Fiddler AI

Fiddler AI sells the AI Control Plane, a platform for first-party and third-party agents from the creation layer to production. Fiddler combines continuous evaluation, monitoring, enforceable policy and auditable governance for enterprises. Fiddler Centor Models power guardrails and evaluations in-environment, with no external LLM API calls.[2][3]

Fiddler Agentic Observability monitors every layer of the agentic hierarchy from application health to agent interactions to individual spans. Fiddler ML Observability provides root cause analysis and fairness metrics such as disparate impact, demographic parity and equal opportunity. Fiddler Guardrails enforce policy inline, at the agent's request and response path, in under 80ms. Fiddler detects and redacts PII, PHI and secrets on the same request, before a prompt reaches the model and before a response reaches the developer. The Free plan includes real-time guardrails powered by Fiddler Centor Models at under 80ms latency, protecting against hallucinations, toxicity, PII/PHI, prompt injection and jailbreak attempts. Fiddler tracks 100+ out-of-the-box and custom metrics including hallucination, toxicity, PII/PHI leakage and jailbreak attempts.[2][3][4][5][6]

Fiddler AI provides centralized governance and oversight for agents and predictive models across the enterprise, with a registry of your agents, enforced guardrails and the audit evidence needed to meet evolving regulatory requirements. Agent Registry lists every agent application in Fiddler, including first-party, third-party and coding agents. Fiddler records evaluation and policy outcomes with full traceability and generates audit evidence aligned with frameworks and regulations such as GDPR, HIPAA, NAIC, SR 11-7, NIST AI RMF, ISO/IEC 42001 and the EU AI Act. Guardrails run in your own environment, so prompts and responses never leave your infrastructure. Teams can monitor predictive models and agents for drift, bias and performance degradation, run deep diagnostics to find root causes, and create custom reports for MRM and compliance reviews. Fiddler extends governance to the creation layer, monitoring the IDE, CLI and MCP boundary to validate tool invocations against allowlists, scan for secrets, and prevent coding agents from committing insecure code or accessing unauthorized repositories.[5][7]

Fiddler is offered in SaaS, VPC and AWS GovCloud. Fiddler can be deployed in any secure cloud environment or air-gapped. Fiddler states it is SOC 2 Type II compliant, with role-based access control and SSO. Fiddler states it is HIPAA ready. Fiddler AI Observability can run within Amazon SageMaker Studio. Fiddler is model- and cloud-agnostic, working across Azure OpenAI, Amazon Bedrock, LangGraph and 100+ other providers. The Developer plan is usage-based at $0.002 per trace and adds unified observability for agentic and predictive systems, custom evaluators and SSO. The Enterprise plan adds flexible deployment of SaaS, VPC or on-premises, along with white-glove support with a named Customer Success Manager and customized onboarding.[3][5][8]

Fiddler AI is used by organizations deploying agents across all industries, as well as highly regulated industries like financial services, healthcare, insurance and government. The typical users are software and AI engineers, data scientists, platform and DevOps teams, and security and compliance teams. Fiddler positions its AI Observability and Security platform as the Unified AI Command Center for insurers. Fiddler provides a unified AI observability and security platform for healthcare organizations. Fiddler describes itself as the control plane for AI agents in financial services, covering monitoring, policy and governance. Financial institutions deploying AI across underwriting, fraud and trading rely on Fiddler for unified observability, policy enforcement and regulatory-ready audit trails. Fiddler monitors Natural Language Processing and Computer Vision models to track and get real-time alerts on anomalies and data drift. Fiddler explains predictions in ML models powering autonomous vehicles, such as aerial drones and unmanned underwater vehicles. Fortune 100 organizations use Fiddler for agentic and predictive applications. For customer-facing agents, Fiddler governs agents built in-house or integrated from third-party providers in a unified dashboard with audit evidence for GDPR, CCPA, HIPAA and NAIC compliance.[2][3][4][5][6][8][9][10]

Fiddler's founders began with explainability and then expanded to observability to track how models change over time. Fiddler describes itself today as the Control Plane for AI Agents. IQT first invested in Fiddler in 2019.[2][4][6][8][10][11]

Fiddler AI on the record

Sources

Fiddler AI full record

  1. [1]Fiddler Raises $30M Series C to Deliver the First Control Plane for AIFiddler AI · published January 27, 2026 · Tier A
  2. [2]fiddler.aiFiddler AI · fiddler.ai · undated page, accessed November 6, 2026 · Tier A
  3. [3]Fiddler AI: The Control Plane for Enterprise AI AgentsFiddler AI · undated page, accessed November 10, 2026 · Tier A
  4. [4]Fiddler AI Observability for Healthcare LLM ApplicationsFiddler AI · undated page, accessed November 10, 2026 · Tier A
  5. [5]Fiddler AI Control Plane for Financial Services | Fiddler AIFiddler AI · undated page, accessed November 10, 2026 · Tier A
  6. [6]Customer Experience AI Observability for Agents | Fiddler AIFiddler AI · undated page, accessed November 10, 2026 · Tier A
  7. [7]AI Governance, Risk Management, and Compliance (GRC) | Fiddler AIFiddler AI · undated page, accessed November 10, 2026 · Tier A
  8. [8]Fiddler AI Observability for Insurance LLM Applications | Fiddler AIFiddler AI · undated page, accessed November 10, 2026 · Tier A
  9. [9]AI Observability for Lending and Trading | Fiddler AIFiddler AI · undated page, accessed November 10, 2026 · Tier A
  10. [10]Government | Fiddler AIFiddler AI · undated page, accessed November 10, 2026 · Tier A
  11. [11]About Us | Fiddler AIFiddler AI · undated page, accessed November 10, 2026 · Tier A
  12. [12]Fiddler AI Reviews 2026: Details, Pricing, & FeaturesG2 · undated page, accessed November 10, 2026 · Tier C

WitnessAI full record

  1. [1]Unified AI Security and Governance Platform | WitnessAIWitnessAI · undated page, accessed September 27, 2026 · Tier A
  2. [2]Witnessai raises 58 million for global expansion and announces new ways to secure ai agents 302659319WitnessAI via PR Newswire · prnewswire.com · published January 13, 2026 · Tier A
  3. [3]Witnessai launches with guardrails for aiDark Reading · darkreading.com · published May 21, 2024 · Tier B
  4. [4]WitnessaiAppSec Santa · appsecsanta.com · published April 3, 2026 · Tier C
  5. [5]Scaling AI Security with WitnessAI - WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  6. [6]AI Security Platform | Enterprise AI Governance | WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  7. [7]WitnessAI 2.0 Delivers New Regulatory Compliance Capabilities to Support Safe AI Adoption - WitnessAIWitnessAI · published April 30, 2025 · Tier A
  8. [8]Ensuring Compliance with the EU AI Act - WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  9. [9]WitnessAI Achieves SOC 2 Type II Compliance - WitnessAIWitnessAI · published October 21, 2025 · Tier A
  10. [10]WitnessAI Joins ServiceNow Control Tower Alliance - WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  11. [11]TENEX.AI and WitnessAI Partner to Deliver Managed Security and Compliance Services for Enterprise AI - WitnessAIWitnessAI · published June 17, 2025 · Tier A
  12. [12]How Security Leaders Prove ROI and Reduce Risk - WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  13. [13]WitnessAI Reviews 2026: Details, Pricing, & FeaturesG2 · undated page, accessed November 10, 2026 · Tier C

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