vioscaleAI
Comparison

Arize Phoenix vs Langfuse

On the evidence we track, Langfuse leads this comparison with a composite score of 66/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Arize Phoenix full profile →Langfuse full profile →
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Arize Phoenix54
★Langfuse66
Score
vioscaleAI score
Arize Phoenix54 / 100medium · 51%
Langfuse66 / 100medium · 56%
Pricing
Free tier
Arize Phoenix✓
Langfuse✓
Model
Arize Phoenixopen_source
Langfusefreemium
Price level
Arize Phoenixfree
Langfusefree
Transparent
Arize Phoenix–
Langfuse✗
Integrations
Count
Arize Phoenix11
Langfuse100
Security
Gdpr
Arize Phoenix–
Langfuse✓
Hipaa
Arize Phoenix–
Langfuse✓
Iso27001
Arize Phoenix–
Langfuse✓
Soc2
Arize Phoenix–
Langfuse✓
Trust center
Vulnerabilities
Reliability
Status page
Arize Phoenix–
Langfuse✓
Adoption
Dependent repos
Arize Phoenix0
Langfuse0
Github stars
Arize Phoenix11,858
Langfuse35,781
Package downloads weekly
Arize Phoenix–
Langfuse6,493,381
Activity
Commits last 30d
Arize Phoenix100
Langfuse100
Release
History
Arize Phoenix20 items
Langfuse20 items
License
Spdx
Arize Phoenix–
LangfuseMIT
Language
Primary
Arize PhoenixPython
LangfuseTypeScript
Market
Availability
Arize Phoenix–
LangfuseAvailable worldwide
Content
Faq
Arize Phoenix3 items
Langfuse7 items

Capabilities

Feature-by-feature on the axes that matter for llm observability. “-” means undocumented, not absent.

Capabilities
Architecture model
Arize PhoenixOpen source self hosted
LangfuseOpen source self hosted
Token cost and latency waterfall charts
Arize Phoenix✓
Langfuse✓
Opentelemetry openllmetry native export support
Arize Phoenix✓
Langfuse✓
Prompt playground and in dashboard replay
Arize Phoenix✓
Langfuse✓
Multi step agentic workflow distributed tracing
Arize Phoenix✓
Langfuse✓
User feedback score API for thumbs up down tags
Arize Phoenix-
Langfuse✓
Pii redaction and prompt content masking
Arize Phoenix-
Langfuse-
Production ab testing of system prompts
Arize Phoenix✓
Langfuse-
Automated anomaly detection for rate limits
Arize Phoenix-
Langfuse-
Native integration with langchain and llamaindex
Arize Phoenix✓
Langfuse✓
SOC2 type ii
Arize Phoenix-
Langfuse-
Mit or apache permissive oss license
Arize Phoenix-
Langfuse-
Pricing model
Arize PhoenixFree open source
LangfuseFree open source

What each one is

The product in its own terms, so the numbers below have context.

Arize Phoenix

A self-hosted platform that traces and evaluates language model application behavior using OpenTelemetry instrumentation, enabling teams to debug, optimize, and monitor LLM performance.

Independently observed

Langfuse

Leader

A comprehensive observability and development platform that combines tracing, prompt management, evaluation, and experimentation, enabling teams to understand LLM behavior in production and ship improved applications with confidence

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Arize Phoenix

Open sourceFree tier

Open-source and free

as of verify ↗

Langfuse

Leader
SubscriptionFree tier

Multiple tiers available; specific pricing not shown in provided text

  • HobbyFree
  • Core-
  • Enterprise-
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Arize Phoenix✓
Langfuse✓
CLI
Arize Phoenix✓
Langfuse✗
Deployment
Cloud / SaaS
Arize Phoenix✗
Langfuse✓
Self-hosted
Arize Phoenix✓
Langfuse✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

In common (7)
  • LlamaIndex
  • OpenAI
  • Anthropic
  • OpenTelemetry
  • Google Gemini
  • LiteLLM
  • LangChain

Arize Phoenix

19 total - 12 not shared
  • AWS Bedrock
  • Vertex AI
  • Claude Code
  • Cursor
  • OpenLLMetry
  • OpenInference
  • Gemini
  • Google Vertex AI
  • Together AI
  • Fireworks
  • NVIDIA NIM
  • Traceloop
Independently observed

Langfuse

Leader
24 total - 17 not shared
  • Vercel AI SDK
  • Pydantic AI
  • Google ADK
  • CrewAI
  • LiveKit
  • Haystack
  • Amazon Bedrock
  • Azure OpenAI
  • Mistral AI
  • xAI
  • vLLM
  • Groq
  • OpenAI SDK
  • Cohere
  • Elasticsearch
  • OpenSearch
  • Hugging Face
Independently observed
Still deciding?

Arize Phoenix or Langfuse: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.