# Metro vs Rolldown

| Attribute | Metro | Rolldown |
|---|---|---|
| **Vioscale score** | 71 (21% (low)) | 49.3 (23% (low)) |
| activity.commits_last_30d | 50 | 100 |
| adoption.dependent_repos | 305,465 | 2 |
| adoption.github_stars | 5,627 | 13,911 |
| deployment.options | `{"self_hosted":true}` | `{"cloud":true}` |
| description.long | Optimized JavaScript bundler for React Native that prioritizes rapid feedback cycles and supports large-scale projects with thousands of modules. | A JavaScript/TypeScript bundler combining Rollup-compatible APIs with esbuild feature parity, designed as the standard bundler for Vite. Free and open-source software built and maintained by a core team with community contributions. |
| integrations.count | - | 5 |
| integrations.list | - | `[{"name":"Rollup"},{"name":"Vite"},{"name":"esbuild"},{"name":"napi-rs"},{"name":"GitHub"}]` |
| language.primary | JavaScript | Rust |
| license.spdx | MIT | MIT |
| market.availability | - | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true}` | `{"cli":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://metrobundler.dev","retrievedAt":"2026-08-20T16:36:51.300Z"}` | `{"type":"open_source","plans":[{"free":true,"name":"Open Source","features":["Rust-based bundler","Rollup-compatible API","Esbuild feature parity","Built-in transforms and minification","Vite 8+ integration"],"description":"Full bundler with transforms, minification, and plugin support"}],"freeTier":true,"sourceUrl":"https://rolldown.rs","retrievedAt":"2026-08-20T16:36:15.492Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | open_source | open_source |
| pricing.price_level | free | free |
| pricing.transparent | - | yes |
| release.cadence_days | 11 | 6 |
| release.history | `[{"url":"https://github.com/react/metro/releases/tag/v0.84.5","date":"2026-08-19T15:29:25Z","type":"stable","version":"v0.84.5"},{"url":"https://github.com/react/metro/releases/tag/v0.83.8","date":"2026-08-19T15:21:23Z","type":"stable","version":"v0.83.8"},{"url":"https://github.com/react/metro/releases/tag/v0.87.0","date":"2026-07-13T15:23:08Z","type":"stable","version":"v0.87.0"},{"url":"https://github.com/react/metro/releases/tag/v0.86.0","date":"2026-07-06T16:46:29Z","type":"stable","version":"v0.86.0"},{"url":"https://github.com/react/metro/releases/tag/v0.85.0","date":"2026-06-23T16:07:47Z","type":"stable","version":"v0.85.0"},{"url":"https://github.com/react/metro/releases/tag/v0.84.4","date":"2026-04-30T11:39:20Z","type":"stable","version":"v0.84.4"},{"url":"https://github.com/react/metro/releases/tag/v0.83.7","date":"2026-04-29T10:46:10Z","type":"stable","version":"v0.83.7"},{"url":"https://github.com/react/metro/releases/tag/v0.83.6","date":"2026-04-13T17:00:24Z","type":"stable","version":"v0.83.6"},{"url":"https://github.com/react/metro/releases/tag/v0.84.3","date":"2026-04-13T16:04:32Z","type":"stable","version":"v0.84.3"},{"url":"https://github.com/react/metro/releases/tag/v0.83.5","date":"2026-03-01T16:15:07Z","type":"stable","version":"v0.83.5"},{"url":"https://github.com/react/metro/releases/tag/v0.84.2","date":"2026-02-27T17:48:20Z","type":"stable","version":"v0.84.2"},{"url":"https://github.com/react/metro/releases/tag/v0.84.1","date":"2026-02-25T15:02:37Z","type":"stable","version":"v0.84.1"},{"url":"https://github.com/react/metro/releases/tag/v0.84.0","date":"2026-02-20T20:49:15Z","type":"stable","version":"v0.84.0"},{"url":"https://github.com/react/metro/releases/tag/v0.83.4","date":"2026-02-20T03:41:11Z","type":"stable","version":"v0.83.4"},{"url":"https://github.com/react/metro/releases/tag/v0.83.3","date":"2025-10-01T12:22:13Z","type":"stable","version":"v0.83.3"},{"url":"https://github.com/react/metro/releases/tag/v0.83.2","date":"2025-09-18T16:05:59Z","type":"stable","version":"v0.83.2"},{"url":"https://github.com/react/metro/releases/tag/v0.83.1","date":"2025-07-24T14:02:11Z","type":"stable","version":"v0.83.1"},{"url":"https://github.com/react/metro/releases/tag/v0.83.0","date":"2025-07-13T11:12:43Z","type":"stable","version":"v0.83.0"},{"url":"https://github.com/react/metro/releases/tag/v0.82.5","date":"2025-07-06T08:13:15Z","type":"stable","version":"v0.82.5"},{"url":"https://github.com/react/metro/releases/tag/v0.82.4","date":"2025-05-21T17:08:59Z","type":"stable","version":"v0.82.4"}]` | `[{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.2.6","date":"2026-08-26T12:05:05Z","type":"stable","version":"v1.2.6"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.2.5","date":"2026-08-19T13:30:59Z","type":"stable","version":"v1.2.5"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.2.4","date":"2026-08-12T10:33:48Z","type":"stable","version":"v1.2.4"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.2.3","date":"2026-08-05T10:52:38Z","type":"stable","version":"v1.2.3"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.2.2","date":"2026-08-03T09:50:37Z","type":"stable","version":"v1.2.2"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.2.1","date":"2026-07-29T13:25:27Z","type":"stable","version":"v1.2.1"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.2.0","date":"2026-07-15T11:08:44Z","type":"stable","version":"v1.2.0"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.1.5","date":"2026-07-08T11:32:27Z","type":"stable","version":"v1.1.5"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.1.4","date":"2026-07-01T14:02:02Z","type":"stable","version":"v1.1.4"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.1.3","date":"2026-06-24T10:49:00Z","type":"stable","version":"v1.1.3"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.1.2","date":"2026-06-18T13:33:10Z","type":"stable","version":"v1.1.2"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.1.1","date":"2026-06-11T09:09:53Z","type":"stable","version":"v1.1.1"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.1.0","date":"2026-06-03T14:06:51Z","type":"stable","version":"v1.1.0"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.0.3","date":"2026-05-27T11:50:23Z","type":"stable","version":"v1.0.3"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.0.2","date":"2026-05-20T08:49:43Z","type":"stable","version":"v1.0.2"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.0.1","date":"2026-05-13T12:45:04Z","type":"stable","version":"v1.0.1"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.0.0","date":"2026-05-07T09:10:49Z","type":"stable","version":"v1.0.0"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.0.0-rc.18","date":"2026-04-29T13:44:23Z","type":"stable","version":"v1.0.0-rc.18"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.0.0-rc.17","date":"2026-04-22T11:14:45Z","type":"stable","version":"v1.0.0-rc.17"},{"url":"https://github.com/rolldown/rolldown/releases/tag/v1.0.0-rc.16","date":"2026-04-16T09:05:43Z","type":"stable","version":"v1.0.0-rc.16"}]` |
| security.scorecard | 5.1 | - |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=metro-minify-uglify&per_page=100","last_12m":0,"max_severity":null}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=rolldown&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Bundlers)

| Capability | Metro | Rolldown |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Dev server hmr | - | - |
| Native esm dev | - | - |
| Code splitting | - | - |
| Tree shaking | - | - |
| Css bundling | - | - |
| Zero config | - | - |
| Webpack plugin compat | - | - |
| Rollup plugin compat | - | - |
| Monorepo aware | - | - |
| Source maps | - | - |

*Source: Vioscale. Generated 2026-09-01T17:13:34.004Z. "-" = undocumented, not absent.*