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Opik (Comet) vs Arize Phoenix
Side-by-side comparison of features, pricing, and ratings
Pricing
Freemium
Freemium
Plans
—
Free
Contact for pricing
Popularity
3.9k views
7.3k 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
Agent tracing with prompts, retrievals, tool calls, outputs
LLM-as-judge evaluation and human annotation
Dataset creation from traces for experiments
Prompt IDE for iterative prompt optimization
Hypothesis testing with benchmarked experiments
Cost, latency, and performance scoring
Self-hosted deployment (local, Docker, Kubernetes)
Cloud-based free instances with no infrastructure setup
OpenTelemetry native support
Vendor-agnostic: works with any model/framework/language
Open-source (ELv2) with community contributions
9k+ GitHub stars and 2.5M+ monthly downloads
Integrations
LlamaIndex
OpenTelemetry