CISO Tribune

Vendor comparison · 2 companies

42Crunch vs Fiddler AI

42Crunch sells a platform for governing the security of MCP servers, APIs and AI agents at enterprise scale. 42Crunch says it helps enterprises bring AI security under control. 42Crunch describes the job as discovering every MCP server that AI agents expose or consume, securing each one against attack, and assessing compliance with AI regulations and security frameworks. Fiddler AI sells the AI Control Plane, a platform for first-party and third-party agents from the creation layer to production. CISO Tribune files both under AI model and agent security. 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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  • 42Crunch
  • Fiddler AI
42Crunch vs Fiddler AI: Products, Customers and Funding Compared
42Crunch42Crunch sells a platform for governing the security of MCP servers, APIs and AI agents at enterprise scale. 42Crunch says it helps enterprises bring AI security under control. 42Crunch describes the job as discovering every MCP server that AI agents expose or consume, securing each one against attack, and assessing compliance with AI regulations and security frameworks.42crunch.comFiddler AIFiddler AI sells the AI Control Plane, a platform for first-party and third-party agents from the creation layer to production.fiddler.ai
What it sells
  • AI Regulatory Compliance[5]Evaluates every MCP server against regulatory and industry frameworks. Maps each finding to the control it breaches.
  • 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.
Categories
Headquarters
London, United KingdomNot stated on its pages
Founded
Not stated on its pages2018[1]
Ownership and funding
Not stated on its pagesPrivately held[12]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • September 23, 202642Crunch announced the general availability of its MCP Security Governance solution.[8]
  • January 19, 202642Crunch announced the availability of API Contract Generator in developer IDEs.[9]
  • January 27, 2026Fiddler AI announced a $30 million Series C funding round led by RPS Ventures.[1]
G2 and Gartner Peer Insights
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
  • G2: listed, seen November 10, 2026[12]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
From its own pages, 42Crunch sells mainly to enterprise security and platform teams that govern MCP servers, APIs and AI agent security at scale. Its pricing is sized to the number of APIs, MCP servers and users in an organization. Individual developers who use its AI coding agent plugins have a separate self-serve pricing option.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.
Last verified
November 9, 2026November 6, 2026

Where they overlap

  • 42Crunch and Fiddler AI are both filed under AI model and agent security.

Where they differ, field by field

  • 42Crunch's primary category is API security; Fiddler AI's is AI model and agent security.
  • 42Crunch is also filed under Dynamic application security testing. Fiddler AI is also filed under AI governance and AI firewalls and guardrails.
  • 42Crunch lists AI Regulatory Compliance. Fiddler AI lists Agentic Observability, ML Observability, Fiddler Centor Models and Agent Registry.
  • 42Crunch is headquartered in London, United Kingdom.
  • Fiddler AI was founded in 2018.
  • Fiddler AI is privately held.

What it sells: 42Crunch

What AI Regulatory Compliance does[5]
42Crunch continuously evaluates every MCP server against the regulatory and industry frameworks an organization answers to. It maps each finding to the specific control it breaches. The page says compliance posture is computed by the control on every audit and every scan, not assembled from documents afterward. Its headline refers to real-time compliance reporting mapped to five frameworks.

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 42Crunch and Fiddler AI

What do 42Crunch and Fiddler AI sell?
42Crunch sells AI Regulatory Compliance. Fiddler AI sells Agentic Observability, ML Observability, Fiddler Centor Models and Agent Registry.
Are 42Crunch and Fiddler AI in the same category?
They share AI model and agent security. 42Crunch's primary category is API security and Fiddler AI's is AI model and agent security.
Where are 42Crunch and Fiddler AI headquartered?
42Crunch is headquartered in London, United Kingdom.
When were 42Crunch and Fiddler AI founded?
Fiddler AI was founded in 2018.
Who owns 42Crunch and Fiddler AI?
Fiddler AI is privately held.
Who are 42Crunch and Fiddler AI sold to?
From its own pages, 42Crunch sells mainly to enterprise security and platform teams that govern MCP servers, APIs and AI agent security at scale. 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.
What have 42Crunch and Fiddler AI announced recently?
September 23, 2026: 42Crunch announced the general availability of its MCP Security Governance solution. January 27, 2026: Fiddler AI announced a $30 million Series C funding round led by RPS Ventures.

About 42Crunch

42Crunch sells a platform for governing the security of MCP servers, APIs and AI agents at enterprise scale. 42Crunch says it helps enterprises bring AI security under control. 42Crunch describes the job as discovering every MCP server that AI agents expose or consume, securing each one against attack, and assessing compliance with AI regulations and security frameworks.[4][10]

42Crunch says AI coding agents ship MCP servers faster than any manual inventory process can track. 42Crunch discovers every MCP server across an organization automatically, both sanctioned and shadow alike, audits each one and ranks it by risk. 42Crunch says every request from an AI agent passes through the MCP server before it ever reaches an enterprise system or the API behind it. 42Crunch also says an MCP tool is only as secure as the API it wraps.[4]

42Crunch says its deterministic contract-driven model applies equally to the MCP and API layer. Every MCP server and every API behind it gets a machine-readable contract of its declared surface. In the 42Crunch model, discovery writes the contract, testing measures against it, and runtime enforces it. 42Crunch says the model it uses to secure APIs now extends to the MCP servers AI agents call and expose.[4][6]

On the MCP side, 42Crunch sweeps registries, gateways and repos to surface the shadow servers agents are already calling, then reads each server's advertised tools, resources and prompts and emits a contract. Every finding carries severity, evidence and the fix. 42Crunch fails the build when a server leaves its approved contract, then keeps watching the one in production for new tools, rewritten descriptions and widened permissions.[4]

Tests are generated from the OpenAPI definition and run in the pipeline, covering broken object-level authorization, broken auth, mass assignment and unrestricted resource consumption. All AI generated code is automatically fixed by 42Crunch. For runtime, 42Crunch describes a positive-security firewall assembled from the contract itself, where unknown paths, extra parameters, malformed payloads and over-sharing responses are rejected before they reach the backend.[4]

For compliance, 42Crunch says the EU AI Act, ISO 42001, NIST AI RMF, CSA AICM and OWASP are all tagged automatically on every audit. A security review doubles as compliance evidence without extra work. Each finding arrives already tied to the control it answers, so the audit trail for an AI estate is a by-product of the scan. 42Crunch computes compliance posture control by control on every audit and every scan, not assembled from documents afterward. Each audit and scan checks a server against all applicable frameworks at the same time.[4][5][11]

A server below the threshold does not reach production.[12]

42Crunch is built for enterprise security and platform teams governing MCP servers, APIs and AI agent security at scale. 42Crunch pairs API Audit, Scan and Protection with MCP Contract, Audit, Scan and Protect on one platform, with one set of SQG policies and one CI/CD pattern. Pricing includes a dedicated encrypted tenant, SSO and a dedicated support manager, sized to the number of APIs, MCP servers and users. Individual developers who use the 42Crunch AI coding agent plugins have a self-serve pricing option.[2][3][4][5][6][7][10][12]

42Crunch on the record

Sources

42Crunch full record

  1. [1]42crunch criticalblue announce partnership42Crunch · 42crunch.com · published November 21, 2018 · Tier A
  2. [2]42crunch.com42Crunch · 42crunch.com · undated page, accessed September 27, 2026 · Tier A
  3. [3]42crunch publishes state of api security 202642Crunch · 42crunch.com · published February 11, 2026 · Tier A
  4. [4]42Crunch — AI Security Platform for MCP42Crunch · undated page, accessed October 23, 2026 · Tier A
  5. [5]AI Regulatory Compliance | 42Crunch42Crunch · undated page, accessed October 23, 2026 · Tier A
  6. [6]Management der MCP-Server-Sicherheitslage | 42Crunch42Crunch · undated page, accessed October 23, 2026 · Tier A
  7. [7]About 42Crunch42Crunch · undated page, accessed October 23, 2026 · Tier A
  8. [8]42Crunch Launches MCP Security Governance, Giving Enterprises Detailed AI Exposure Management and Compliance with AI Regulatory Frameworks42Crunch · published September 23, 2026 · Tier A
  9. [9]42Crunch Launches API Contract Generator in Developer IDEs42Crunch · published January 19, 2026 · Tier A
  10. [10]Pricing | 42Crunch42Crunch · undated page, accessed November 4, 2026 · Tier A
  11. [11]KI-Regulierungskonformität | 42Crunch42Crunch · undated page, accessed November 4, 2026 · Tier A
  12. [12]Management der MCP-Server-Sicherheitslage | 42Crunch42Crunch · undated page, accessed November 4, 2026 · Tier A

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

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