# Bun vs uv

**Leader by vioscaleAI score:** Bun

| Attribute | Bun | uv |
|---|---|---|
| **vioscaleAI score** | 74.2 (56% (medium)) | 64.6 (63% (medium)) |
| activity.commits_last_30d | 100 | 100 |
| adoption.dependent_repos | 21,486 | 0 |
| adoption.github_stars | 96,235 | 90,408 |
| adoption.package_downloads_weekly | 3,990,852 | 28,008,035 |
| content.faq | `[{"answer":"Bun is a JavaScript runtime and development toolkit designed as a fast alternative to Node.js with built-in package management, testing, and bundling capabilities. It can be adopted incrementally into existing Node.js projects or used as a complete replacement for development tooling. It is indexed under Package Registries.","source":"https://bun.sh","question":"What is Bun?","confidence":0.6},{"answer":"Bun offers a free tier, so you can start without paying. Pricing changes often, so verify at source before relying on it.","source":"https://bun.sh","question":"Is Bun free?","confidence":0.6},{"answer":"Bun supports Windows, macOS, Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://bun.sh","question":"What platforms does Bun support?","confidence":0.6},{"answer":"Yes. Bun can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://bun.sh","question":"Can Bun be self-hosted?","confidence":0.6},{"answer":"Yes. Bun is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://www.npmjs.com/package/bun","question":"Is Bun open source?","confidence":0.85}]` | `[{"answer":"A unified command-line tool that consolidates the functionality of multiple Python package management and development utilities into a single interface. It delivers substantially faster dependency resolution and installation compared to traditional package managers. It is indexed under Package Registries.","source":"https://docs.astral.sh/uv","question":"What is uv?","confidence":0.6},{"answer":"uv is open source, so it can be self-hosted and used at no licence cost. It is released under the Apache-2.0 licence. Pricing changes often, so verify at source before relying on it.","source":"https://docs.astral.sh/uv","question":"Is uv free to use?","confidence":0.6},{"answer":"uv supports Windows, macOS, Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://docs.astral.sh/uv","question":"What platforms does uv support?","confidence":0.6},{"answer":"Yes. uv can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://docs.astral.sh/uv","question":"Can uv be self-hosted?","confidence":0.6},{"answer":"We have confirmed 10 integrations for uv, including Docker, GitHub Actions, GitLab CI/CD, AWS Lambda, Azure Artifacts, AWS CodeArtifact, JFrog Artifactory and PyTorch, plus 2 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://docs.astral.sh/uv","question":"What does uv integrate with?","confidence":0.6},{"answer":"Yes. uv is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/astral-sh/uv","question":"Is uv open source?","confidence":0.95}]` |
| deployment.options | `{"cloud":true,"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | A JavaScript runtime that executes TypeScript natively using JavaScriptCore, bundling a package manager, bundler, and test runner with Node.js compatibility and npm ecosystem support. | A unified command-line tool that consolidates the functionality of multiple Python package management and development utilities into a single interface. It delivers substantially faster dependency resolution and installation compared to traditional package managers. |
| features.capabilities | `{"role":"manager_client","ecosystem":"js","deployment":"cli_local","workspaces":true,"open_source":"oss","pricing_model":"free","upstream_proxy":true,"package_formats":"multi","private_packages":true,"content_addressable":true,"vuln_license_scanning":true,"lockfile_deterministic":true,"supply_chain_integrity":true}` | `{"role":"manager_client","ecosystem":"python","deployment":"cli_local","workspaces":true,"open_source":"oss","pricing_model":"free","package_formats":"multi","vuln_license_scanning":false,"lockfile_deterministic":true,"supply_chain_integrity":true}` |
| integrations.count | - | 17 |
| integrations.list | - | `[{"name":"Docker"},{"name":"GitHub Actions"},{"name":"GitLab CI/CD"},{"name":"AWS Lambda"},{"name":"Azure Artifacts"},{"name":"AWS CodeArtifact"},{"name":"JFrog Artifactory"},{"name":"PyTorch"},{"name":"FastAPI"},{"name":"Jupyter"}]` |
| language.primary | Rust | Rust |
| license.spdx | MIT | Apache-2.0 |
| platform.support | `{"cli":true,"mac":true,"linux":true,"windows":true}` | `{"cli":true,"mac":true,"linux":true,"windows":true}` |
| pricing | `{"type":"open_source","summary":"Free and open source","freeTier":true,"sourceUrl":"https://bun.sh","retrievedAt":"2026-10-14T22:32:45.643Z"}` | `{"type":"open_source","sourceUrl":"https://docs.astral.sh/uv","retrievedAt":"2026-10-05T11:03:05.919Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | open_source | open_source |
| pricing.price_level | free | free |
| release.cadence_days | 14 | 2 |
| release.history | `[{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.4.3","date":"2026-10-10T05:24:54Z","type":"stable","version":"bun-v1.4.3"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.4.2","date":"2026-09-05T05:55:48Z","type":"stable","version":"bun-v1.4.2"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.4.1","date":"2026-09-04T08:33:19Z","type":"stable","version":"bun-v1.4.1"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.4.0","date":"2026-08-20T14:07:21Z","type":"stable","version":"bun-v1.4.0"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.14","date":"2026-05-13T03:48:28Z","type":"stable","version":"bun-v1.3.14"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.13","date":"2026-04-20T08:07:57Z","type":"stable","version":"bun-v1.3.13"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.12","date":"2026-04-10T03:04:46Z","type":"stable","version":"bun-v1.3.12"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.11","date":"2026-03-18T04:31:40Z","type":"stable","version":"bun-v1.3.11"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.10","date":"2026-02-26T07:08:20Z","type":"stable","version":"bun-v1.3.10"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.9","date":"2026-02-08T09:31:23Z","type":"stable","version":"bun-v1.3.9"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.8","date":"2026-01-29T10:38:16Z","type":"stable","version":"bun-v1.3.8"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.7","date":"2026-01-27T07:04:03Z","type":"stable","version":"bun-v1.3.7"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.6","date":"2026-01-13T02:27:21Z","type":"stable","version":"bun-v1.3.6"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.5","date":"2025-12-17T16:55:41Z","type":"stable","version":"bun-v1.3.5"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.4","date":"2025-12-07T04:53:19Z","type":"stable","version":"bun-v1.3.4"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.3","date":"2025-11-21T19:32:02Z","type":"stable","version":"bun-v1.3.3"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.2","date":"2025-11-08T07:57:10Z","type":"stable","version":"bun-v1.3.2"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.1","date":"2025-10-22T07:53:48Z","type":"stable","version":"bun-v1.3.1"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.3.0","date":"2025-10-10T20:32:14Z","type":"stable","version":"bun-v1.3.0"},{"url":"https://github.com/oven-sh/bun/releases/tag/bun-v1.2.23","date":"2025-09-28T14:23:34Z","type":"stable","version":"bun-v1.2.23"}]` | `[{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.23","date":"2026-10-03T17:34:11Z","type":"stable","version":"0.12.23"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.22","date":"2026-10-02T00:20:42Z","type":"stable","version":"0.12.22"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.21","date":"2026-09-29T21:14:06Z","type":"stable","version":"0.12.21"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.20","date":"2026-09-28T23:20:35Z","type":"stable","version":"0.12.20"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.19","date":"2026-09-25T00:33:02Z","type":"stable","version":"0.12.19"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.18","date":"2026-09-22T23:00:51Z","type":"stable","version":"0.12.18"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.17","date":"2026-09-18T18:59:24Z","type":"stable","version":"0.12.17"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.16","date":"2026-09-18T01:01:42Z","type":"stable","version":"0.12.16"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.15","date":"2026-09-15T12:09:40Z","type":"stable","version":"0.12.15"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.14","date":"2026-09-15T02:19:30Z","type":"stable","version":"0.12.14"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.13","date":"2026-09-10T19:27:24Z","type":"stable","version":"0.12.13"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.12","date":"2026-09-09T16:45:15Z","type":"stable","version":"0.12.12"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.11","date":"2026-09-08T20:45:27Z","type":"stable","version":"0.12.11"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.10","date":"2026-09-04T23:15:57Z","type":"stable","version":"0.12.10"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.9","date":"2026-09-01T21:58:26Z","type":"stable","version":"0.12.9"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.8","date":"2026-08-31T22:18:57Z","type":"stable","version":"0.12.8"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.7","date":"2026-08-27T22:14:06Z","type":"stable","version":"0.12.7"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.6","date":"2026-08-25T19:41:07Z","type":"stable","version":"0.12.6"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.5","date":"2026-08-14T19:57:52Z","type":"stable","version":"0.12.5"},{"url":"https://github.com/astral-sh/uv/releases/tag/0.12.4","date":"2026-08-13T21:16:08Z","type":"stable","version":"0.12.4"}]` |
| security.vulnerabilities | `{"count":2,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=bun&per_page=100","last_12m":0,"max_severity":"HIGH"}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=spack&package_name=py-uv&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Package Registries)

| Capability | Bun | uv |
|---|:--:|:--:|
| **Core** |  |  |
| Role | Package manager client | Package manager client |
| **Ecosystem** |  |  |
| Ecosystem / language | JavaScript | Python |
| **Deployment** |  |  |
| Deployment | CLI-local | CLI-local |
| **Formats** |  |  |
| Package formats supported | Many formats | Many formats |
| **Hosting** |  |  |
| Private / scoped packages | ✓ | - |
| Upstream proxy / caching | ✓ | - |
| **Resolution** |  |  |
| Lockfile / deterministic installs | ✓ | ✓ |
| Workspaces / monorepo | ✓ | ✓ |
| Content-addressable store | ✓ | - |
| **Supply chain** |  |  |
| Supply-chain integrity | ✓ | ✓ |
| Vulnerability / licence scanning | ✓ | ✗ |
| **Licensing** |  |  |
| Openness | Open-source | Open-source |
| **Pricing** |  |  |
| Pricing model | Free / OSS | Free / OSS |

*Source: vioscaleAI. Generated 2026-10-16T14:19:56.714Z. "-" = undocumented, not absent.*