vioscaleAI
Comparison

Langfuse vs Weights & Biases

No clear leader: Langfuse (66.4) and Weights & Biases (64.6) 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 →Weights & Biases full profile →
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Langfuse66
Weights & Biases65
Score
vioscaleAI score
Langfuse66 / 100medium · 56%
Weights & Biases65 / 100low · 44%
Pricing
Free tier
Langfuse✓
Weights & Biases✓
Model
Langfusefreemium
Weights & Biasesfree
Price level
Langfusefree
Weights & Biasesfree
Transparent
Langfuse✗
Weights & Biases✗
Integrations
Count
Langfuse100
Weights & Biases9
Security
Certifications
Disclosure policy
Langfuse–
Weights & Biases✓
Gdpr
Langfuse✓
Weights & Biases✓
Hipaa
Langfuse✓
Weights & Biases✓
Iso27001
Langfuse✓
Weights & Biases✓
Soc2
Langfuse✓
Weights & Biases✓
Trust center
Vulnerabilities
Reliability
Status page
Langfuse✓
Weights & Biases✓
Adoption
Dependent repos
Langfuse0
Weights & Biases9,299
Github stars
Langfuse35,781
Weights & Biases11,268
Package downloads weekly
Langfuse6,493,381
Weights & Biases–
Activity
Commits last 30d
Langfuse100
Weights & Biases100
Release
Cadence days
Langfuse–
Weights & Biases16
History
Langfuse20 items
Weights & Biases20 items
License
Spdx
LangfuseMIT
Weights & BiasesMIT
Language
Primary
LangfuseTypeScript
Weights & BiasesPython
Market
Availability
LangfuseAvailable worldwide
Weights & Biases–
Content
Faq
Langfuse7 items
Weights & Biases6 items

Capabilities

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

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

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

Weights & Biases

A collaborative development platform that enables tracking of ML experiments, versioning of models, evaluation of AI systems, and deployment to production. It provides specialized observability and tracing capabilities for LLM applications, with support for both managed cloud and self-hosted infrastructure.

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 ↗

Weights & Biases

FreeFree tier
as of verify ↗

Platform & deployment

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

Platforms
Web
Langfuse✓
Weights & Biases✓
iOS
Langfuse✗
Weights & Biases✓
CLI
Langfuse✗
Weights & Biases✓
Deployment
Cloud / SaaS
Langfuse✓
Weights & Biases✓
Self-hosted
Langfuse✓
Weights & Biases✓
On-premise
Langfuse✗
Weights & Biases✓

Integrations

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

In common (2)
  • LangChain
  • OpenAI

Langfuse

24 total - 22 not shared
  • Vercel AI SDK
  • LiteLLM
  • Pydantic AI
  • Google ADK
  • CrewAI
  • LiveKit
  • Haystack
  • LlamaIndex
  • Anthropic
  • Amazon Bedrock
  • Azure OpenAI
  • Mistral AI
  • Google Gemini
  • xAI
  • vLLM
  • Groq
  • OpenAI SDK
  • Cohere
  • Elasticsearch
  • OpenSearch
  • Hugging Face
  • OpenTelemetry
Independently observed

Weights & Biases

16 total - 14 not shared
  • Alibaba Qwen
  • Meta Llama
  • Microsoft Phi
  • Hangzhou DeepSeek
  • Z.ai GLM
  • MoonshotAI Kimi
  • CoreWeave
  • TensorBoard
  • AWS Bedrock
  • Claude Code
  • Google Agent Development Kit
  • SambaNova Cloud
  • Friendli
  • deepset
Independently observed
Still deciding?

Langfuse or Weights & Biases: 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.