Fiddler
Founded Year
2018Stage
Series B - II | AliveTotal Raised
$63.8MLast Raised
$18.6M | 1 yr agoRevenue
$0000Mosaic Score The Mosaic Score is an algorithm that measures the overall financial health and market potential of private companies.
+215 points in the past 30 days
About Fiddler
Fiddler focuses on artificial intelligence (AI) observability and responsible AI governance in the technology sector. The company provides services such as monitoring, explainable AI, and analytics to support the performance and integrity of machine learning models and large language models. Fiddler serves sectors that need AI governance and risk management, including government and financial services. It was founded in 2018 and is based in Palo Alto, California.
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Fiddler's Product Videos
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ESPs containing Fiddler
The ESP matrix leverages data and analyst insight to identify and rank leading companies in a given technology landscape.
The AI agent security & risk management platform market includes companies that continuously evaluate and mitigate the cybersecurity, regulatory, and privacy risks inherent in AI agent solutions. Companies in this market improve the security posture of agents against threats like prompt injection, PII and other data leaks, identity and access controls, and systems breaches. These platforms may als…
Fiddler named as Leader among 15 other companies, including Lakera, Skyflow, and HiddenLayer.
Fiddler's Products & Differentiators
Fiddler AI Observability
Fiddler provides a full stack AI Observability that aligns teams across the organization with real-time alerts and model monitoring, rich model diagnostics and built in explainable AI (XAI) that help you identify the underlying issues impacting model outcomes, and build a framework for responsible AI practices. AI Observability is reliant not only on metrics but also on how actionable model insights are for ML teams to retrain and fine-tune models can be explained when something eventually goes wrong.
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Research containing Fiddler
Get data-driven expert analysis from the CB Insights Intelligence Unit.
CB Insights Intelligence Analysts have mentioned Fiddler in 7 CB Insights research briefs, most recently on Sep 5, 2025.
Sep 5, 2025 report
Book of Scouting Reports: The AI Agent Tech Stack
May 16, 2025 report
Book of Scouting Reports: 2025’s AI 100
Apr 24, 2025 report
AI 100: The most promising artificial intelligence startups of 2025
Oct 13, 2023
The open-source AI development market map
Sep 29, 2023
The machine learning operations (MLOps) market map
Expert Collections containing Fiddler
Expert Collections are analyst-curated lists that highlight the companies you need to know in the most important technology spaces.
Fiddler is included in 7 Expert Collections, including Regtech.
Regtech
1,453 items
Technology that addresses regulatory challenges and facilitates the delivery of compliance requirements. Regulatory technology helps companies and regulators address challenges ranging from compliance (e.g. AML/KYC) automation and improved risk management.
Game Changers 2018
36 items
Our selected startups are high-momentum companies pioneering technology with the potential to transform society and economies for the better.
Fintech
9,685 items
Companies and startups in this collection provide technology to streamline, improve, and transform financial services, products, and operations for individuals and businesses.
AI 100 (All Winners 2018-2025)
300 items
Winners of CB Insights' 5th annual AI 100, a list of the 100 most promising private AI companies in the world.
Generative AI
2,793 items
Companies working on generative AI applications and infrastructure.
Artificial Intelligence
10,195 items
Latest Fiddler News
Jul 23, 2025
UKHotViews PwC UK has announced the launch of “Assurance for AI”, a suite of services which includes new formal independent assurance over relevant AI controls. The offering is described as complementary to, but distinct from, the firm’s existing advisory services. Assurance for AI will be delivered by multidisciplinary teams that combine technical knowledge of AI and expertise in audit, risk management, internal controls, attestation services, and external standards. As both the enterprise-wide deployment of AI gathers pace and regulatory pressures on the domain increase, so a new ecosystem of assurance providers is emerging to validate, test, and certify these complex technologies. Unlike traditional software testing, AI systems require probabilistic rather than deterministic approaches, continuous monitoring for model drift, and sophisticated bias detection across protected attributes. PwC is far from alone in identifying the significance of the opportunity which this segment represents. Its Big Four rivals have all developed offers to address this rapidly evolving space: Deloitte through its Algorithm Assurance Practice; EY via its AI Assurance Framework; and KPMG in the shape of its Trusted AI framework. The IT services heavyweights are also building on their traditional testing strengths to create capabilities designed to address the new needs created by AI systems. Examples of this include Infosys’s AI-First Testing platform. Wipro’s AssureNXT platform and TCS’s Smart Quality Engineering Platform. In parallel, a new generation of pure-play AI assurance companies is emerging to address gaps left by traditional consulting approaches. These firms, such as Credo AI and Fiddler AI, offer purpose-built technology platforms specifically designed for AI governance, testing, and continuous monitoring, fundamentally changing how organisations approach AI validation. The latest move by PwC is certainly timely and its provision for the first time of a formal independent assurance service ups the ante against its consulting competitors. It is unlikely that it will be too long before its rivals follow suit.
Fiddler Frequently Asked Questions (FAQ)
When was Fiddler founded?
Fiddler was founded in 2018.
Where is Fiddler's headquarters?
Fiddler's headquarters is located at 291 Lambert Avenue, Palo Alto.
What is Fiddler's latest funding round?
Fiddler's latest funding round is Series B - II.
How much did Fiddler raise?
Fiddler raised a total of $63.8M.
Who are the investors of Fiddler?
Investors of Fiddler include Lightspeed Venture Partners, Lux Capital, Insight Partners, Essence VC Fund, Alpha Square Group and 22 more.
Who are Fiddler's competitors?
Competitors of Fiddler include Armilla AI, NannyML, 2021.AI, FairPlay, Prime Intellect and 7 more.
What products does Fiddler offer?
Fiddler's products include Fiddler AI Observability and 1 more.
Who are Fiddler's customers?
Customers of Fiddler include Tide, how.fm and Conjura.
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Compare Fiddler to Competitors
Arthur focuses on artificial intelligence (AI) performance monitoring and management within the machine learning operations (MLOps) sector. It offers solutions for deploying, monitoring, and optimizing machine learning models, ensuring scalability, security, and compliance for enterprise use. Its products include tools for evaluating large language models (LLMs), providing a firewall for LLMs, and enhancing AI model observability. It was founded in 2018 and is based in New York, New York.
Arize provides tools for AI observability and LLM evaluation within the machine learning and artificial intelligence sectors. The company offers a platform for monitoring, diagnosing, and improving the performance of AI models and applications in production. Arize's tools are based on open-source standards and can integrate with existing AI infrastructure. It was founded in 2020 and is based in Mill Valley, California.
Fairly AI specializes in AI governance, risk, and compliance management within the technology sector. It offers a continuous monitoring platform that applies policies, testing, and reporting to manage enterprise AI models effectively. Its solutions are designed to ensure AI systems are safe, secure, and compliant with relevant policies and regulations. It was founded in 2015 and is based in Kitchener, Canada.
Deeploy focuses on the deployment, governance, and explainability of AI and machine learning models in various sectors. The company provides a platform that integrates MLOps and real-time monitoring, ensuring compliance with regulations and offering explanations for AI decisions. Deeploy serves industries that require adherence to AI governance and compliance, including finance, healthcare, and insurance. It was founded in 2020 and is based in Utrecht, Netherlands.
Microsoft AI Factory is located at the Station F startup campus, focusing on artificial intelligence and specifically designed to launch an AI ecosystem gathering startups, researchers, and corporations. It is based in Paris, France.
Credo AI offers a platform that automates artificial intelligence (AI) oversight, risk management, and regulatory compliance to facilitate responsible AI adoption. Credo AI's services include AI auditing to ensure system integrity and fairness, as well as educational workshops to empower teams in AI governance practices. It was founded in 2020 and is based in Palo Alto, California.
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