Fiddler AI vs PM2

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

PM2

See full pricing history

USD · US · source: pm2.keymetrics.io

Plan	Pricing	Charged by	Offer type
OpenSource	Free OpenSource	Flat · published offer	Standalone · Free
Plus	USD 39 monthly Starts at $39/month	Flat · /mo	Standalone · Starting at
Enterprise Runtime	USD 79 monthly Starts at $79/month	Flat · /mo	Standalone · Starting at

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

PM2

OpenSource

Plan card PM2 Process Manager: Included
Plan card Zero Downtime Reloads: Included
Plan card Terminal Based Monitoring: Included

Plus

Plan card Node.js production monitoring: Included
Plan card Real-time web monitoring: Included
Plan card Email and Slack notifications: Included

Enterprise Runtime

Plan card Synthetic application overview: Included
Plan card Custom metrics: Included
Plan card Server health check monitoring: 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

PM2

August 27, 2026 Source
- OpenSource: Free
- Plus: USD 39 monthly
- Enterprise Runtime: USD 79 monthly