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Langfuse vs WunderGraph Cosmo

Langfuse provides LLM observability, unrelated to GraphQL federation.
LangfuseOpen Source Observability & Analytics for LLM Apps 🕵️‍♂️WunderGraph Cosmo A drop-in replacement for Apollo GraphOS

Side by side

What it is
Langfuse:Langfuse is an open-source platform for tracing, evaluating and monitoring LLM applications and AI agents.
WunderGraph Cosmo:WunderGraph Cosmo is an open-source GraphQL federation platform for building, managing and scaling federated APIs.
Best for
Langfuse:LLM observability & analytics
WunderGraph Cosmo:Open-source GraphQL federation platform
Who it’s for
Langfuse:Developers building, debugging and scaling LLM-based apps and agents.
WunderGraph Cosmo:Platform and engineering teams needing self-hosted or managed GraphQL federation.
Pricing
Langfuse:Freemium
WunderGraph Cosmo:Freemium
Plans
Langfuse:Hobby Free · Core $29 per month · Pro $199 per month · Enterprise $2499 per month
WunderGraph Cosmo:Launch $499 per month · Scale $3499 per month
Open source
Langfuse:Yes, 35,097 GitHub stars
WunderGraph Cosmo:Yes, 1,269 GitHub stars
Works with
Langfuse:Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift
WunderGraph Cosmo:Go, Kafka, NATS, Redis, Prometheus, OpenTelemetry, Datadog
DevHunt upvotes
Langfuse:89
WunderGraph Cosmo:5
Launched on DevHunt
Langfuse:Jan 2023
WunderGraph Cosmo:Jan 2023

Langfuse features

  • Hierarchical Traces. Capture every LLM call, tool invocation and retrieval step with filters for user, session, cost and latency.
  • Prompt Management. Version, fetch, release and cache prompts separately from code with one-click deployments.
  • Evaluation Engine. Run LLM-as-judge, heuristic or human-review evaluations on production data or experiments.
  • Experiments & Datasets. Define test cases, run experiments and create golden datasets for continuous improvement.
  • Dashboards & Alerts. Monitor cost, latency and quality via custom dashboards and automated alerts.
  • Human Annotation. Collaborative human-in-the-loop workflows with annotation queues.
  • Extensive Integrations. Supports Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift and 100+ agent frameworks and model providers.
  • Self-hosted & Cloud Options. Available as hosted SaaS or self-hosted under MIT license.
Langfuse on DevHunt →Alternatives

WunderGraph Cosmo features

  • Self-hosted Router. Run the Cosmo router on any infrastructure with full control.
  • Event-Driven Federated Subscriptions. Combine GraphQL federation with Kafka, NATS or Redis for scalable subscriptions.
  • OpenTelemetry & Prometheus Support. Integrates with existing observability stacks for metrics and tracing.
  • Custom Router Modules. Extend the router with Go modules or gRPC plugins.
  • Schema Registry & Studio. Manage schemas, query plans and analytics via a unified UI.
  • Enterprise-grade Security. SOC 2 compliance, OIDC, SCIM and role-based access control on Cosmo Cloud.
WunderGraph Cosmo on DevHunt →Alternatives

Based on each tool's website and DevHunt data. Details may change; check the official sites.