Fiddler AI vs Helicone

See how their public offers line up before you choose your own position. Prices stay in the currency, billing schedule, and charged unit each vendor publishes.

Fiddler AI

See full pricing history

USD · US · source: www.fiddler.ai

Plan	Pricing	Charged by	Offer type
Free — Free	Free Free	Flat	Standalone · Free
Developer — Developer Highlighted	$0.002 per trace $0.002 per trace	Usage · per trace	Standalone · Usage based

Helicone

See full pricing history

USD · US · source: www.helicone.ai

Plan	Pricing	Charged by	Offer type
Hobby — Free	Free Free	Flat	Standalone · Free
Pro — Popular Highlighted	USD 79 monthly · USD 79 / month with annual commitment $79 per month	Flat · $79 per month	Standalone · Fixed

What each plan includes

Feature names follow each vendor’s own pricing page, so verify the wording before treating them as exact equivalents.

Fiddler AI

Free — Free

Highlights Real-time guardrails to detect harmful exposure: Included
Highlights Protects against hallucinations, Toxicity, PII/PHI, Prompt Injection, and Jailbreak attempts: Included
Highlights Latency of <80ms: Included
Highlights Powered by contextual and task specific Fiddler Centor Models: Included

Developer — Developer

Highlights Everything in Free, plus: Included
Highlights Unified AI observability, including tests and experiments, for agentic and predictive systems: Included
Highlights Custom evaluators and bring your own judge: Included
Highlights Visualization-driven insights: Included
Highlights Role based access control and SSO: Included
Highlights SaaS deployment: Included

Helicone

Hobby — Free

Monitoring Requests: 10,000/mo

Included
Data Retention Storage: 1 GB

Included
Workspace & collaboration Seats: 1 seat, 1 organization

Included

Pro — Popular

Workspace & collaboration Seats: Unlimited

Included
Monitoring Alerts & reports: Included
Monitoring HQL (Query Language): Included
Data Retention Storage: 1 GB free + usage-based

Included
Data Retention Data retention: 1 month

Included
Data Retention Ingestion: 1,000 logs/min

Included
Data Retention API access: 60 calls/min

Included

How their prices changed

Each dated row shows the public prices observed when that vendor’s pricing page changed.

Fiddler AI

August 27, 2026 Source
- Free — Free: Free
- Developer — Developer: $0.002 per trace

Helicone

August 27, 2026 Source
- Hobby — Free: Free
- Pro — Popular: USD 79 monthly · USD 79 / month with annual commitment