
Fiddler is a pioneer in AI Observability for responsible AI. The unified environment provides a common language, centralized controls, and actionable insights to operationalize ML models and GenAI and LLM applications with trust. Monitoring, analytics, and explainable AI capabilities address the unique challenges of building in-house stable and secure LLM and MLOps at scale. Fiddler helps you grow into advanced capabilities over time and build a framework for responsible AI practices. Fortune 500 organizations use Fiddler across pre-production and production to deliver high performance AI, reduce costs, and be responsible in governance.

Fiddler is a pioneer in AI Observability for responsible AI. The unified environment provides a common language, centralized controls, and actionable insights to operationalize ML models and GenAI and LLM applications with trust. Monitoring, analytics, and explainable AI capabilities address the unique challenges of building in-house stable and secure LLM and MLOps at scale. Fiddler helps you grow into advanced capabilities over time and build a framework for responsible AI practices. Fortune 500 organizations use Fiddler across pre-production and production to deliver high performance AI, reduce costs, and be responsible in governance.
Founded: 2018
Headquarters: Palo Alto, CA
Product focus: Enterprise AI observability, governance, and AI control plane
Recent financing: $30M Series C (Jan 2026)
Total funding (reported): $100M
Responsible AI, model performance management, MLOps/LLMOps, and AI governance/observability.
2018
Software Development
$32M
Reported Series B announced in 2021; company reported having raised more than $45M at that time.
$30M
Series C announced bringing total funding to $100M.
“Backed by a mix of venture and strategic investors including RPS Ventures (lead for Series C), Insight Partners, Lightspeed, Lux Capital, Capgemini Ventures, Dallas VC, Dentsu Ventures, Mozilla Ventures, LG Technology Ventures, Benhamou Global Ventures, and LDV Partners.”
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