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Langfuse vs Arize Phoenix
Side-by-side comparison of features, pricing, and ratings
Pricing
Freemium
Freemium
Plans
$0/mo
$29/mo
$199/mo
$2499/mo
$0/mo
$50/mo
Custom
Popularity
6.4k views
7.3k views
Skill Level
Intermediate
Intermediate
API Available
Platforms
WebAPI
WebAPICLI
Categories
⚙️ Developer Infrastructure
⚙️ Developer Infrastructure
Features
Hierarchical LLM traces with cost/latency filtering
LLM-as-a-judge evaluation and heuristic functions
One-click prompt deployment and rollback
Playground for side-by-side model/input testing
Experiments with test case comparison
Human annotation and golden dataset creation
Cost and latency dashboards with alerts
Monitors and alerts (Slack, webhooks, GitHub Actions)
Full-text search (Cloud rollout)
Code evaluators (Python/TypeScript)
Langfuse Assistant (natural-language queries)
Multi-modal datasets (images, audio, video, documents)
OpenTelemetry-native instrumentation
Python and TypeScript native SDKs
REST APIs and S3 blob storage export
Distributed tracing for LLM agents
Capture prompts, retrievals, tool calls, outputs
LLM-as-judge evaluation
Human annotations on traces
Create datasets from traces
Run experiments to compare changes
Prompt IDE for iteration
AI engineering agent PXI
Self-host locally, Docker, or Kubernetes
Cloud instances with free tier
Vendor agnostic: any model or framework
ELv2 open-source license
3M+ monthly downloads, 9k+ GitHub stars
Community Slack support
Integrations
LangChain
Vercel AI SDK
LiteLLM
Pydantic AI
Google ADK
CrewAI
LiveKit
OpenAI
Anthropic
Amazon Bedrock
Azure OpenAI
Mistral AI
Google Gemini
xAI
Groq
Claude Code
OpenClaw
Dify
Langflow
OpenRouter
n8n
Spring AI
Cursor
PostHog
DSPy
LlamaIndex
NVIDIA NeMo
Hugging Face
OpenTelemetry
Kubernetes
Docker
Python SDK
JavaScript SDK