Fiddler AI
fiddler.ai
AI observability and model monitoring platform.
Quick Information
- Category:
- MLOps & Infrastructure
- Pricing:
- Freemium
- Platforms:
- Web, Cloud, Self-hosted
- Free Plan:
- Yes
- API Available:
- Yes
- Last Verified:
- October 2026
What Is Fiddler AI?
Fiddler AI is an AI observability and model monitoring platform that now positions itself as a control plane for AI agents. Its press release says it raised a $30 million Series C led by RPS Ventures on January 27, 2026, bringing total funding to about $100 million. One outlet reports $32 million led by Insight Partners, but the company's own figure is $30 million, so I rely on that. A single profile says Fiddler acquired Lumeus in April 2026 to cover coding agents, which I could not corroborate, so treat it as unconfirmed.
Pricing per third-party reviews has three tiers, none verified against Fiddler's own page. The free tier offers real-time guardrails covering hallucination, toxicity, PII and PHI exposure, prompt injection and jailbreak attempts, with no observability included. The Developer tier costs $0.002 per trace and adds unified observability, custom evaluators and SSO, and is SaaS-only. Enterprise is custom-priced with flexible SaaS, VPC or on-premise deployment. Guardrails are said to respond in under 80 milliseconds. One review notes Fiddler does not offer an LLM gateway; it reads telemetry from traffic that something else routes, so you need your own routing layer.
Fiddler suits regulated enterprises that need monitoring, explainability and guardrails across ML models and agents. Compare Arize AI, Evidently AI and WhyLabs. Browse the MLOps & Infrastructure tools directory for more.
What Can You Use Fiddler AI For?
Agent and LLM guardrails
Low-latency.
Model monitoring and explainability
Regulated industries.
Fiddler AI Features
- Series C of $30M — January 27, 2026.
- Per-trace pricing — $0.002.
- Flexible deployment — Enterprise.
Who Is Fiddler AI For?
- Regulated enterprises — Explainability.
- AI platform teams — Control plane.
Fiddler AI Pros & Limitations
What We Like
- Free guardrails tier
- Transparent per-trace price
- Enterprise deployment options
Limitations
- No LLM gateway
- Pricing from third parties
- Free tier excludes observability
Fiddler AI Pricing
| Plan | Price | Main Features |
|---|---|---|
| Free guardrails | $0 | Hallucination, toxicity, PII/PHI, prompt injection, jailbreak checks; no observability |
| Developer | $0.002 per trace | Observability, custom evaluators, SSO; SaaS only |
| Enterprise | Custom | SaaS, VPC or on-premise |
Pricing was last verified October 2026. Check the official website for the latest pricing.
AI Listing Jungle Ranking
- Global Rank:
- #912
- Overall Score:
- 45.9/100
- Monthly Users:
- –
- Rank Change:
- ▲ 666
This ranking reflects AI Listing Jungle's own independent scoring methodology and is not an endorsement by Fiddler AI or its company. How Our Rankings Work
Frequently Asked Questions
Is there a free tier?
Guardrails only.
Developer price?
$0.002 per trace.
How much did it raise?
$30M Series C per the company.
Can I self-host?
Enterprise offers VPC or on-premise.
Our Take
Enterprise-grade observability with guardrails.
Verify pricing with Fiddler.
Fiddler AI Alternatives
Fiddler AI Comparisons
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