Fiddler AI vs Little Warden

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

Little Warden

See full pricing history

GBP · US · source: littlewarden.com

Plan	Pricing	Charged by	Offer type
Freelancer — default	GBP 24.99 monthly £24 .99 /month	Flat · £24 .99 /month	Standalone · Fixed
Small Team — default Highlighted	GBP 34.99 monthly £34 .99 /month	Flat · £34 .99 /month	Standalone · Fixed
Agency — default	GBP 59.99 monthly £59 .99 /month	Flat · £59 .99 /month	Standalone · Fixed
Large Agency — default	GBP 149.99 monthly £149 .99 /month	Flat · £149 .99 /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

Little Warden

Freelancer — default

Highlights URLs Patrolled: 20

Included
Highlights Data Retention: 2 Weeks

Included
Highlights Checks per URL: Up to 10

Included
Highlights Team Members: 1

Included

Small Team — default

Highlights URLs Patrolled: 100

Included
Highlights Data Retention: 1 Months

Included
Highlights Checks per URL: Up to 15

Included
Highlights Team Members: Unlimted

Included
Highlights API access: Included

Agency — default

Highlights URLs Patrolled: 650

Included
Highlights Data Retention: 3 Months

Included
Highlights Checks per URL: Up to 20

Included
Highlights Team Members: Unlimted

Included
Highlights API access: Included

Large Agency — default

Highlights URLs Patrolled: 5000

Included
Highlights Data Retention: 6 Months

Included
Highlights Checks per URL: Up to 30

Included
Highlights Team Members: Unlimted

Included
Highlights API access: 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

Little Warden

August 27, 2026 Source
- Freelancer — default: GBP 24.99 monthly
- Small Team — default: GBP 34.99 monthly
- Agency — default: GBP 59.99 monthly
- Large Agency — default: GBP 149.99 monthly