FA

Fiddler AI

Infrastructure

AI observability and security platform that evaluates, monitors and guardrails ML and generative AI applications and agents in production.

Total funding$100M

Valuation—

Employees—

Founded2018

HeadquartersPalo Alto, USA

StatusPrivate

Products

Selected offerings — the AI products recorded here, not the vendor's full catalogue.

• Fiddler AI Platform Sold on its own

  AI observability platform: evaluation, monitoring and real-time guardrails for ML models and generative AI/agentic applications in production.

• Fiddler Auditor Developer tool Sold on its own

  Source-available library for red-teaming and robustness testing of LLMs, run independently of the hosted Fiddler platform. Fiddler's own page calls it "open-source"; its repository's actual licence is the Elastic License 2.0, which is not an OSI-approved open-source licence (it restricts offering the software as a competing hosted service), so it is recorded here by its real terms rather than the vendor's label.

Inside Fiddler AI Control Plane

• Fiddler Agentic Observability Application

  Tracing and monitoring module for multi-step agent workflows within the Fiddler AI Control Plane, tracking tool calls, reasoning steps and failures across an agent's execution.

• Fiddler AI Governance, Risk Management, and Compliance Application

  Governance module within the Fiddler AI Control Plane providing model inventories, policy enforcement and audit-ready reporting for regulatory compliance (e.g. EU AI Act) across an organization's AI systems.

• Fiddler Continuous Evaluations Application

  Ongoing automated evaluation module within the Fiddler AI Control Plane that re-scores production LLM/agent outputs against quality and safety metrics over time, not just at launch.

• Fiddler Guardrails Application

  Runtime safety layer within the Fiddler AI Control Plane that screens LLM/agent inputs and outputs for hallucination, toxicity, PII and jailbreak attempts before they reach users.

Closest alternatives 1

AAArize AIPrivateFiddler's own comparison page.2 of 3 capabilitiesShared product typeSourced competitorBuild and run AI agentsCompare

Similar products 49

How this list is ranked ↗

AAArthur AIPrivate · $62.7M raisedFiddler AI and Arthur both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareDDatadogPublic · $84.9BFiddler AI Governance, Risk Management, and Compliance and Agent Observability do comparable work on guardrails and safety; both also serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareBBraintrustPrivate · $125M raisedFiddler AI and Braintrust both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (growth-stage private).1 of 3 capabilitiesShared product typeSame scale bandCompareDDeepchecksAbsorbedFiddler AI and Deepchecks LLM Evaluation both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Deepchecks is absorbed, with no independent scale.1 of 3 capabilitiesShared product typeCompareGGalileoAcquired ($68M deal)Fiddler AI and Galileo both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Galileo is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareLLangfuseAcquiredFiddler AI and Langfuse both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareCMComet MLPrivate · $70M raisedFiddler AI and Comet Model Production Monitoring both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).1 of 3 capabilitiesShared product typeCompareDDatabricksPrivate · $190BFiddler Agentic Observability and Agent Bricks both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareHHeliconeAcquiredFiddler AI and Helicone both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Helicone is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareAAAutomation AnywherePrivateFiddler Guardrails and AI Agent Studio do comparable work on guardrails and safety; Automation Anywhere's scale not recorded.3 of 3 capabilitiesShared product typeCompareSSplunkAcquiredFiddler Continuous Evaluations and Splunk Observability Cloud both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Splunk is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareCClickHousePrivate · $1.1B raisedFiddler AI and ClickStack both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareEElasticPublic · $10.2BFiddler Continuous Evaluations and Elastic LLM Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).2 of 3 capabilitiesShared product typeCompareRAResemble AIPrivateFiddler Guardrails and Resemble Watermarker do comparable work on guardrails and safety; Resemble AI's scale not recorded.1 of 3 capabilitiesShared product typeCompareLLangChainPrivate · $160M raisedFiddler AI and LangSmith both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (growth-stage private).2 of 3 capabilitiesShared product typeSame scale bandCompareITInvisible TechnologiesPrivate · $144M raisedFiddler AI Governance, Risk Management, and Compliance and Synapse do comparable work on guardrails and safety; both also serve buyers who need to watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (growth-stage private).3 of 3 capabilitiesShared product typeSame scale bandCompareDDataikuPrivate · $3.7BFiddler Agentic Observability and Dataiku Agent Hub both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareTTuringPrivate · $2.2BFiddler Guardrails and Turing Intelligence Platform do comparable work on guardrails and safety; similar scale (private); ships agent platform and data service rather than the same layer.3 of 3 capabilitiesDifferent layerCompareW&Weights & BiasesAcquiredOverlaps on evaluation and observability; Weights & Biases is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareSSAPPublic · $256.3BFiddler AI and SAP AI Agent Hub both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareIIBMPublic · $216.6BFiddler AI Governance, Risk Management, and Compliance and IBM watsonx.governance do comparable work on guardrails and safety; both also serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareHCHuawei CloudPrivateFiddler Guardrails and Content Moderation do comparable work on guardrails and safety; Huawei Cloud's scale not recorded.1 of 3 capabilitiesShared product typeCompareGGlean (Glean Technologies)Private · $7.2BFiddler Guardrails and Glean AI Gateway do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompareMMicrosoftPublic · $3.7TFiddler Continuous Evaluations and Observability in Foundry Control Plane both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareSServiceNowPublic · $130.1BFiddler AI and AI Control Tower both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareSSamaPrivateFiddler AI Governance, Risk Management, and Compliance and Sama GenAI do comparable work on guardrails and safety; Sama's scale not recorded.2 of 3 capabilitiesShared product typeCompareZZscalerPublic · $30.5BOverlaps on evaluation and observability and guardrails and safety; similar scale (public).2 of 3 capabilitiesShared product typeCompareCCoreWeavePublic · $48.5BFiddler AI and CoreWeave ARIA both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).1 of 3 capabilitiesShared product typeCompareSSierraPrivate · $15.8BFiddler Continuous Evaluations and Insights both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareWWorkdayPublic · $49.3BFiddler AI Governance, Risk Management, and Compliance and Agent System of Record do comparable work on guardrails and safety; both also serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareCCognigyAcquiredFiddler AI and Cognigy AI Ops Center both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Cognigy is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareHAHume AIPrivateFiddler AI and Kairos Platform both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Hume AI's scale not recorded.1 of 3 capabilitiesShared product typeCompareHHiddenLayerPrivate · $50M raisedFiddler Guardrails and HiddenLayer AI Discovery do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompareWWriterPrivate · $1.9BFiddler Guardrails and WRITER AI Studio do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeComparePAPalo Alto NetworksPublic · $302.9BFiddler Guardrails and Prisma AIRS AI Gateway do comparable work on guardrails and safety; similar scale (public).3 of 3 capabilitiesShared product typeCompareBByteDancePrivateFiddler AI and Coze Loop both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; ByteDance's scale not recorded.2 of 3 capabilitiesShared product typeCompareNNVIDIAPublic · $5.1TFiddler AI Governance, Risk Management, and Compliance and NVIDIA NeMo do comparable work on guardrails and safety; both also serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareYYellow.aiPrivateOverlaps on agent orchestration and evaluation and observability; Yellow.ai's scale not recorded.2 of 3 capabilitiesShared product typeCompareHHaptikAcquired ($112M deal)Fiddler Continuous Evaluations and Haptik Agent Analytics both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Haptik is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareCCiscoPublic · $433.3BFiddler AI Governance, Risk Management, and Compliance and Cisco AI Defense do comparable work on guardrails and safety; similar scale (public).3 of 3 capabilitiesShared product typeCompareJJasperPrivateFiddler Guardrails and Jasper Brand IQ do comparable work on guardrails and safety; Jasper's scale not recorded.2 of 3 capabilitiesShared product typeCompareFForethoughtPrivate · $115M raisedFiddler Continuous Evaluations and Forethought QA Agent both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (growth-stage private).1 of 3 capabilitiesShared product typeSame scale bandCompareAAnthropicPrivate · $965BFiddler Guardrails and Claude Security do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompareBBroadcomPublic · $1.7TFiddler Guardrails and AgentMinder do comparable work on guardrails and safety; similar scale (public).1 of 3 capabilitiesShared product typeCompareMMercorPrivate · $20BFiddler AI and Mercor Enterprise Evals both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private); ships data service rather than the same layer.1 of 3 capabilitiesDifferent layerCompareDDecagonPrivate · $4.5BFiddler Continuous Evaluations and Experiments both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareCCyeraPrivate · $12BFiddler Guardrails and Cyera Agent Guardian do comparable work on guardrails and safety; similar scale (private).1 of 3 capabilitiesShared product typeCompareSSentinelOnePublic · $7.5BFiddler Guardrails and Prompt Security do comparable work on guardrails and safety; similar scale (public).1 of 3 capabilitiesShared product typeCompareCCodeRabbitPrivate · $1.5BFiddler Guardrails and CodeRabbit Security do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompare

Closest alternatives are pairs a vendor page itself compares. Similar products are matched from what each product does; nothing in that group is asserted as a rivalry.

Sources

Total funding

Press release · 27 Jan 2026

Same release, on the $30M Series C: "The investment brings Fiddler's total funding to $100M." A stated cumulative total, not just the round.

Founded

News reporting · 20 Dec 2021

Amazon Science staff interview with Fiddler's CEO: "who started the company in 2018 with the belief that businesses needed a new kind of explainable AI service..." fiddler.ai's own About page and press releases carry no founding year.

Status

Official documentation · 9 Sep 2026

Fetched 2026-09-09: no acquisition or wind-down language; actively marketed with a live pricing page.

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