# Metaflow vs Ray

**Leader by Vioscale score:** Ray

| Attribute | Metaflow | Ray |
|---|---|---|
| **Vioscale score** | 58.2 (66% (medium)) | 66.8 (68% (medium)) |
| activity.commits_last_30d | 18 | 100 |
| adoption.dependent_repos | 106 | 3,641 |
| adoption.github_stars | 10,244 | 43,612 |
| adoption.package_downloads_weekly | 193,305 | 11,291,327 |
| deployment.options | `{"cloud":true,"on_prem":true,"self_hosted":true}` | `{"cloud":true,"hybrid":true,"on_prem":true,"self_hosted":true}` |
| description.long | An open-source tool that enables data scientists and engineers to move from local experimentation to scalable production systems, with features for tracking experiments, versioning data and models, and orchestrating compute across multiple cloud platforms or self-hosted infrastructure. | 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":"framework","managed_cloud":true,"self_hostable":true,"multi_provider":true,"vpc_deployment":true,"otel_compatible":true,"framework_agnostic":true,"experiment_tracking":true}` | `{"managed_cloud":true,"model_serving":true,"self_hostable":true,"multi_provider":true,"vpc_deployment":true,"framework_agnostic":true,"experiment_tracking":true}` |
| integrations.count | 3 | 17 |
| integrations.list | `[{"name":"AWS"},{"name":"Azure"},{"name":"Google Cloud"}]` | `[{"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 | Python | Python |
| license.spdx | Apache-2.0 | Apache-2.0 |
| market.availability | `{"hqCountry":"US","primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"cli":true}` | `{"cli":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://metaflow.org","retrievedAt":"2026-08-14T09:21:30.422Z"}` | `{"type":"free","freeTier":true,"sourceUrl":"https://www.ray.io","retrievedAt":"2026-08-14T16:39:27.110Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | open_source | commercial |
| pricing.price_level | free | free |
| release.cadence_days | 5 | 18 |
| release.history | `[{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.38","date":"2026-08-18T00:34:39Z","type":"stable","version":"2.19.38"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.37","date":"2026-08-11T17:15:05Z","type":"stable","version":"2.19.37"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.36","date":"2026-08-05T18:15:13Z","type":"stable","version":"2.19.36"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.35","date":"2026-06-24T22:08:22Z","type":"stable","version":"2.19.35"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.34","date":"2026-06-18T12:37:53Z","type":"stable","version":"2.19.34"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.33","date":"2026-06-09T19:37:12Z","type":"stable","version":"2.19.33"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.32","date":"2026-06-03T21:24:38Z","type":"stable","version":"2.19.32"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.31","date":"2026-06-01T01:48:44Z","type":"stable","version":"2.19.31"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.30","date":"2026-05-29T08:38:51Z","type":"stable","version":"2.19.30"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.29","date":"2026-05-11T23:37:35Z","type":"stable","version":"2.19.29"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.28","date":"2026-05-07T16:37:54Z","type":"stable","version":"2.19.28"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.27","date":"2026-05-06T15:44:03Z","type":"stable","version":"2.19.27"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.26","date":"2026-05-05T19:10:56Z","type":"stable","version":"2.19.26"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.25","date":"2026-05-05T17:20:26Z","type":"stable","version":"2.19.25"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.24","date":"2026-05-01T18:36:35Z","type":"stable","version":"2.19.24"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.23","date":"2026-04-28T04:04:38Z","type":"stable","version":"2.19.23"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.22","date":"2026-03-20T21:38:19Z","type":"stable","version":"2.19.22"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.21","date":"2026-03-11T23:56:51Z","type":"stable","version":"2.19.21"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.20","date":"2026-02-26T20:51:42Z","type":"stable","version":"2.19.20"},{"url":"https://github.com/Netflix/metaflow/releases/tag/2.19.19","date":"2026-02-09T13:28:43Z","type":"stable","version":"2.19.19"}]` | `[{"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.scorecard | 7 | 5.7 |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=metaflow&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 | Metaflow | Ray |
|---|:--:|:--:|
| **Core** |  |  |
| Tool role | Agent / RAG framework | - |
| **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 2026-09-01T17:03:12.761Z. "-" = undocumented, not absent.*