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Opik (Comet) vs Phoenix
Side-by-side comparison of features, pricing, and ratings
Pricing
Freemium
Freemium
Plans
—
$0/mo (open-source)
$0/mo (managed cloud)
Custom
Popularity
3.9k views
7.0k views
Skill Level
Intermediate
Intermediate
API Available
Platforms
WebAPICLI
WebAPICLI
Categories
💻 Code & Development📊 Data & Analytics🤖 Automation & Agents
💻 Code & Development📊 Data & Analytics
Features
End-to-end agent tracing and debugging
LLM-as-a-judge evaluation metrics (30+)
Automated test suites with plain-text assertions
Ollie coding assistant auto-fixes codebase
Agent Playground for end-to-end testing
Prompt Optimizer with six algorithms
Production monitoring and real-time alerts
Guardrails for content, PII, and policy violations
Token usage and cost tracking
Audit log generation for governance
Version control for prompts and parameters
Open-source core (GitHub 19k stars)
Self-hostable or cloud via Comet
Trace every agent step (prompts, retrievals, tool calls, outputs)
LLM-as-judge evaluation for output scoring
Create datasets from traces for experiments
Run experiments to benchmark performance
Prompt IDE for prompt iteration
Self-hosted deployment for data privacy
Vendor agnostic: works with any model/framework
Native OpenTelemetry support
Local run in under a minute
Docker container deployment
Kubernetes Helm chart deployment
Cloud instances (free up to 2)
Annotation system for human/LLM feedback
Support for agent integration plugins
Integrations
OpenTelemetry
LlamaIndex
NVIDIA NeMo Agent Toolkit
Docker
Kubernetes