vioscaleAI
Comparison

Langfuse vs Ray

No clear leader: Ray (70.8) and Langfuse (66.4) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

Langfuse full profile →Ray full profile →
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Langfuse66
Ray71
Score
vioscaleAI score
Langfuse66 / 100medium · 56%
Ray71 / 100medium · 65%
Pricing
Free tier
Langfuse✓
Ray✓
Model
Price level
Langfusefree
Rayfree
Transparent
Langfuse✗
Ray–
Integrations
Count
Langfuse100
Ray17
Security
Gdpr
Langfuse✓
Ray–
Hipaa
Langfuse✓
Ray–
Iso27001
Langfuse✓
Ray–
Scorecard
Langfuse–
Ray5.7
Soc2
Langfuse✓
Ray–
Trust center
Vulnerabilities
Reliability
Status page
Langfuse✓
Ray✓
Adoption
Dependent repos
Langfuse0
Ray3,641
Github stars
Langfuse35,781
Ray44,036
Package downloads weekly
Activity
Commits last 30d
Langfuse100
Ray100
Release
Cadence days
Langfuse–
Ray18
History
Langfuse20 items
Ray20 items
License
Spdx
LangfuseMIT
RayApache-2.0
Language
Primary
LangfuseTypeScript
RayPython
Market
Availability
LangfuseAvailable worldwide
Ray–
Content
Faq
Langfuse7 items
Ray6 items

Capabilities

Feature-by-feature on the axes that matter for mlops & llmops tools. “-” means undocumented, not absent.

Core
Tool role
LangfuseLLM observability / eval
RayAgent / RAG framework
Deployment
Self-hostable / OSS core
Langfuse✓
Ray✓
Managed cloud available
Langfuse✓
Ray✓
On-prem / VPC deployment
Langfuse✓
Ray✓
Observability
LLM tracing / observability
Langfuse✓
Ray✓
Evaluation (offline / LLM-judge / human)
Langfuse✓
Ray-
Dev
Prompt management + versioning
Langfuse✓
Ray-
Tracking
Experiment tracking / model registry
Langfuse✓
Ray✓
Serving
Model serving / inference endpoint
Langfuse✗
Ray✓
Interop
OpenTelemetry / OpenLLMetry compatible
Langfuse✓
Ray✓
Framework-agnostic
Langfuse✓
Ray✓
Gateway
Multi-provider model support
Langfuse✓
Ray✓
Data
No-train-on-customer-data guarantee
Langfuse-
Ray-

What each one is

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

Langfuse

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

Ray

Open-source framework for building and scaling distributed ML and Python applications, supporting the full pipeline from data processing and model training to inference and serving with simple APIs.

Independently observed

Pricing

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

Langfuse

SubscriptionFree tier

Multiple tiers available; specific pricing not shown in provided text

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

Ray

Open source
as of verify ↗

Platform & deployment

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

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

Integrations

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

In common (1)
  • vLLM

Langfuse

24 total - 23 not shared
  • LangChain
  • Vercel AI SDK
  • LiteLLM
  • Pydantic AI
  • Google ADK
  • CrewAI
  • LiveKit
  • Haystack
  • LlamaIndex
  • OpenAI
  • Anthropic
  • Amazon Bedrock
  • Azure OpenAI
  • Mistral AI
  • Google Gemini
  • xAI
  • Groq
  • OpenAI SDK
  • Cohere
  • Elasticsearch
  • OpenSearch
  • Hugging Face
  • OpenTelemetry
Independently observed

Ray

27 total - 26 not shared
  • PyTorch
  • TensorFlow
  • AIBrix
  • AReaL
  • Cosmos Curate
  • Daft
  • Data-Juicer
  • DeltaCAT
  • Modin
  • NeMo Curator
  • NeMo-RL
  • OpenRLHF
  • RayDP
  • ROLL
  • SkyRL
  • SLIME
  • Syftr
  • verl
  • Kubernetes
  • AWS
  • GCP
  • Azure
  • Databricks
  • DeltaLake
  • +2 more
Independently observed
Still deciding?

Langfuse or Ray: 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.