# Langfuse vs Ray

| Attribute | Langfuse | Ray |
|---|---|---|
| **Vioscale score** | 64.2 (66% (medium)) | 66.8 (68% (medium)) |
| activity.commits_last_30d | 100 | 100 |
| adoption.dependent_repos | 0 | 3,641 |
| adoption.github_stars | 33,763 | 43,612 |
| adoption.package_downloads_weekly | 6,083,004 | 11,291,327 |
| deployment.options | `{"cloud":true,"self_hosted":true}` | `{"cloud":true,"hybrid":true,"on_prem":true,"self_hosted":true}` |
| description.long | 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 | Ray is an open-source unified framework for scaling Python and machine learning applications across any infrastructure. It provides distributed compute primitives, specialized AI libraries for data processing, model training, tuning, and serving, with seamless scaling from development environments to large clusters. |
| features.capabilities | `{"role":"observability","evaluation":true,"managed_cloud":true,"model_serving":false,"pricing_model":"free_open_source","self_hostable":true,"multi_provider":true,"vpc_deployment":true,"otel_compatible":true,"llm_observability":true,"prompt_management":true,"architecture_model":"open_source_self_hosted","framework_agnostic":true,"experiment_tracking":true,"token_cost_and_latency_waterfall_charts":true,"prompt_playground_and_in_dashboard_replay":true,"multi_step_agentic_workflow_distributed_tracing":true,"opentelemetry_openllmetry_native_export_support":true,"user_feedback_score_api_for_thumbs_up_down_tags":true,"native_integration_with_langchain_and_llamaindex":true}` | `{"managed_cloud":true,"model_serving":true,"self_hostable":true,"multi_provider":true,"vpc_deployment":true,"framework_agnostic":true,"experiment_tracking":true}` |
| integrations.count | 100 | 17 |
| integrations.list | `[{"name":"LangChain"},{"name":"Vercel AI SDK"},{"name":"LiteLLM"},{"name":"Pydantic AI"},{"name":"Google ADK"},{"name":"CrewAI"},{"name":"LiveKit"},{"name":"Haystack"},{"name":"LlamaIndex"},{"name":"OpenAI"},{"name":"Anthropic"},{"name":"Amazon Bedrock"},{"name":"Azure OpenAI"},{"name":"Mistral AI"},{"name":"Google Gemini"},{"name":"xAI"},{"name":"vLLM"},{"name":"Groq"},{"name":"OpenAI SDK"},{"name":"Cohere"},{"name":"Elasticsearch"},{"name":"OpenSearch"},{"name":"Hugging Face"}]` | `[{"name":"PyTorch"},{"name":"TensorFlow"},{"name":"AIBrix"},{"name":"AReaL"},{"name":"Cosmos Curate"},{"name":"Daft"},{"name":"Data-Juicer"},{"name":"DeltaCAT"},{"name":"Modin"},{"name":"NeMo Curator"},{"name":"NeMo-RL"},{"name":"OpenRLHF"},{"name":"RayDP"},{"name":"ROLL"},{"name":"SkyRL"},{"name":"SLIME"},{"name":"Syftr"},{"name":"verl"},{"name":"vLLM"}]` |
| language.primary | TypeScript | Python |
| license.spdx | MIT | Apache-2.0 |
| market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"cli":true,"web":true}` | `{"cli":true}` |
| pricing | `{"type":"subscription","plans":[{"free":true,"name":"Hobby"},{"free":false,"name":"Core"},{"free":false,"name":"Enterprise"}],"summary":"Multiple tiers available; specific pricing not shown in provided text","freeTier":true,"sourceUrl":"https://langfuse.com/changelog/2025-08-08-openai-pricing-availability","retrievedAt":"2026-08-13T09:38:11.860Z"}` | `{"type":"free","freeTier":true,"sourceUrl":"https://www.ray.io","retrievedAt":"2026-08-14T16:39:27.110Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | commercial |
| pricing.price_level | low | free |
| pricing.transparent | no | - |
| release.cadence_days | - | 18 |
| release.history | `[{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.21.0","date":"2026-08-26T12:36:06Z","type":"stable","version":"v4.21.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.20.0","date":"2026-08-26T11:13:56Z","type":"stable","version":"v4.20.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v3.225.5","date":"2026-08-26T12:34:41Z","type":"stable","version":"v3.225.5"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.19.0","date":"2026-08-25T15:37:56Z","type":"stable","version":"v4.19.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.18.0","date":"2026-08-25T09:41:55Z","type":"stable","version":"v4.18.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.17.0","date":"2026-08-24T13:14:03Z","type":"stable","version":"v4.17.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.16.0","date":"2026-08-21T05:59:55Z","type":"stable","version":"v4.16.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v3.225.4","date":"2026-08-20T14:51:50Z","type":"stable","version":"v3.225.4"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.15.0","date":"2026-08-19T16:57:45Z","type":"stable","version":"v4.15.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.14.0","date":"2026-08-19T11:24:18Z","type":"stable","version":"v4.14.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.13.0","date":"2026-08-18T13:30:35Z","type":"stable","version":"v4.13.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.12.0","date":"2026-08-17T14:44:18Z","type":"stable","version":"v4.12.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.11.0","date":"2026-08-14T08:04:16Z","type":"stable","version":"v4.11.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.10.0","date":"2026-08-12T15:32:02Z","type":"stable","version":"v4.10.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v3.225.3","date":"2026-08-12T10:38:13Z","type":"stable","version":"v3.225.3"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.9.0","date":"2026-08-11T13:54:29Z","type":"stable","version":"v4.9.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.8.0","date":"2026-08-11T12:12:28Z","type":"stable","version":"v4.8.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.7.1","date":"2026-08-11T08:31:01Z","type":"stable","version":"v4.7.1"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v4.7.0","date":"2026-08-11T06:10:44Z","type":"stable","version":"v4.7.0"},{"url":"https://github.com/langfuse/langfuse/releases/tag/v3.225.2","date":"2026-08-11T13:44:21Z","type":"stable","version":"v3.225.2"}]` | `[{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.58.0","date":"2026-08-23T05:42:08Z","type":"stable","version":"ray-2.58.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.57.0","date":"2026-08-11T01:15:44Z","type":"stable","version":"ray-2.57.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.56.1","date":"2026-07-17T23:19:47Z","type":"stable","version":"ray-2.56.1"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.56.0","date":"2026-06-29T20:32:55Z","type":"stable","version":"ray-2.56.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.55.1","date":"2026-04-22T20:24:41Z","type":"stable","version":"ray-2.55.1"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.55.0","date":"2026-04-15T20:34:27Z","type":"stable","version":"ray-2.55.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.54.1","date":"2026-03-25T23:37:39Z","type":"stable","version":"ray-2.54.1"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.54.0","date":"2026-02-18T23:44:44Z","type":"stable","version":"ray-2.54.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.53.0","date":"2025-12-20T15:16:24Z","type":"stable","version":"ray-2.53.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.51.2","date":"2025-11-29T00:40:40Z","type":"stable","version":"ray-2.51.2"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.52.1","date":"2025-11-28T02:23:22Z","type":"stable","version":"ray-2.52.1"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.52.0","date":"2025-11-21T19:10:39Z","type":"stable","version":"ray-2.52.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.51.1","date":"2025-11-01T03:27:11Z","type":"stable","version":"ray-2.51.1"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.51.0","date":"2025-10-29T05:33:49Z","type":"stable","version":"ray-2.51.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.50.1","date":"2025-10-18T19:21:43Z","type":"stable","version":"ray-2.50.1"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.50.0","date":"2025-10-10T23:06:29Z","type":"stable","version":"ray-2.50.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.49.2","date":"2025-09-19T18:10:36Z","type":"stable","version":"ray-2.49.2"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.49.1","date":"2025-09-03T00:44:11Z","type":"stable","version":"ray-2.49.1"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.49.0","date":"2025-08-26T19:52:24Z","type":"stable","version":"ray-2.49.0"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.48.0","date":"2025-07-18T22:27:25Z","type":"stable","version":"ray-2.48.0"}]` |
| reliability.status_page | yes | yes |
| security.gdpr | yes | - |
| security.hipaa | yes | - |
| security.iso27001 | yes | - |
| security.scorecard | - | 5.7 |
| security.soc2 | yes | - |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=helm&package_name=langfuse-k8s%2Flangfuse&per_page=100","last_12m":0,"max_severity":null}` | `{"count":12,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=ray&per_page=100","last_12m":6,"max_severity":"CRITICAL"}` |

## Capabilities (MLOps & LLMOps Tools)

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

*Source: Vioscale. Generated 2026-09-01T16:35:12.021Z. "-" = undocumented, not absent.*