Suggestions appear as you type. Use the up and down arrows to choose one and Enter to open it.

This page's audience our own tag's counts — open to see them
–Visits
–Page views
–Clicks to vendors
–Time on page
–Reading now
Clicks to vendors, by tool
  • –
Top countries
  • –
Devices
  • –

– · visits, page views and clicks counted by our own tag, which counts more than our checked analytics; every figure rounded down · how we count

Fiddler AI review

Freemium#10 of 26 in LLM Observability ToolsAI Model Explainability SoftwareAI LLM Observability ToolsMachine Learning Model Monitoring Software+2 more

A governance-focused observability platform for LLMs, agents, retrieval, and predictive models.

8.5/10Editor score
Visit Fiddler AI
Fiddler AI8.5 Visit Fiddler AI

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Fiddler AI is an observability and security platform for teams developing and operating LLM applications, AI agents, and predictive models. It covers development-to-production workflows with testing, evaluations, monitoring, hierarchical traces, diagnostics, guardrails, governance, and compliance-oriented reporting. Teams that need visibility across agent behavior, retrieval, tool calls, costs, and safety controls are the clearest fit.

Pricing is freemium, with a Free plan and a Developer plan priced at $0.002 per trace. The published plans show an Enterprise tier alongside Free and Developer, while the Developer pricing is usage-based rather than presented as a monthly or annual fee. Paid capabilities are centered on operational scale and governance needs, including role-based access control, single sign-on, alerts, dashboards, root-cause analysis, and governance evidence. SaaS, VPC, and on-premises deployment options support different operating environments, while access is provided through web and API platforms.

Fiddler AI’s standout strength is the breadth of its diagnostic and safety coverage. Hierarchical tracing connects the application and session level to agents, traces, and spans; evaluations can use datasets, experiments, comparisons, automated judges, or custom judges. Teams can inspect retrieval, generation, tool calls, and agent handoffs, while real-time guardrails address hallucinations, toxicity, PII/PHI, prompt injection, and jailbreaks. Integrations include LangGraph, Amazon Bedrock, AWS Strands Agents, Azure OpenAI, OpenAI, Llama, Google Vertex AI, and OpenTelemetry. Choose Fiddler AI when governance and guardrails matter as much as tracing; teams seeking only basic observability may find its wider scope unnecessary.

Fiddler AI pros and cons

  • Where it wins
    • Hierarchical tracing covers applications, sessions, agents, traces, and spans
    • Real-time guardrails address hallucinations, PII/PHI, and prompt injection
    • Evaluations, cost visibility, alerts, and governance evidence in one platform
  • Where it doesn't
    • Platform access is limited to web and API
    • Developer pricing is based on trace usage rather than a fixed fee
    • Broader capabilities may exceed the needs of teams seeking basic tracing

Fiddler AI fact sheet, pricing and score →

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated · How we research and update