Fiddler AI
Verified Oct 15, 2026 ActiveEnterprise control plane for AI: guardrails, observability and governance for LLM agents and ML models
Listed on EffectHub ·
Pricing
- Pricing model
- Freemium
Free tier covers real-time guardrails only and is reached through a demo request. Developer tier is usage-metered at $0.002 per trace with SaaS deployment, SSO and RBAC; Enterprise adds VPC or on-premises deployment and dedicated support, priced by sales.
Use tool ↗About Fiddler AI
Fiddler positions itself as an AI control plane: it monitors, evaluates and enforces policy on production ML models and LLM agents, with sub-80ms inline guardrails against jailbreaks, prompt injection, toxicity and PII exposure powered by its own Centor models. It sells to large enterprises in finance, healthcare, insurance and government, and deploys as SaaS, VPC, GovCloud or on-premises. A free guardrails tier exists; the Developer tier meters observability at $0.002 per trace and Enterprise is negotiated. Everything is driven through documented APIs and SDKs.
- Platforms
- Web · API
- API
- Yes
- Last verified
- Oct 15, 2026
Verified sources
- Pricing page: Free tier with real-time guardrails under 80ms on Fiddler Centor models; Developer $0.002 per trace with unified observability, custom evaluators, RBAC and SSO; Enterprise contact sales with SaaS, VPC or on-premise deployment (15 October 2026)fiddler.ai ↗
- Home page positions Fiddler as an observability, guardrails and governance platform for AI agents and ML models (15 October 2026)fiddler.ai ↗
Is Fiddler AI legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Domain registered
- Mar 4, 2018 (8 years ago)Registry record (RDAP), registrar NameCheap, Inc., looked up Sep 14, 2026
- TLS certificate
- Issued by Google Trust Services, valid until Dec 13, 2026Seen in our own connection to the site on Oct 15, 2026
- Last checked
- Oct 15, 2026The site answered
- On the market since
- 2018The vendor's own material, read by us
- Operated by
- Fiddler AI, United StatesOur research, card verified Oct 15, 2026
Pros & cons of Fiddler AI
One of the longer-standing model-monitoring vendors, rebuilt around agent observability and inline guardrails with credible enterprise deployment options. Self-serve depth is limited: the free tier is guardrails-only and anything serious routes through the sales motion.
Pros
- Guardrails run on its own models without external LLM API calls, keeping latency and data exposure down
- Covers classic ML monitoring and agentic tracing in one platform
- Deployment options include SaaS, VPC, GovCloud and on-premises
- Named enterprise customers such as Mastercard and the U.S. Navy
Cons
- Per-trace pricing makes high-volume costs hard to predict without modeling
- Most differentiating capabilities sit behind the Enterprise tier
Best for
- Enterprises needing audit trails and governance over AI agents in regulated industries
- Platform teams unifying monitoring of predictive ML and LLM systems
- Security teams enforcing PII and jailbreak policy at inference time
Not for
- Hobby projects or small startups wanting cheap full observability
- Teams that require an open-source, self-hosted stack