# Buck2

- **Canonical URI:** https://www.vioscale.ai/software/buck2
- **Category:** Monorepo Tools
- **Homepage:** https://buck2.build
- **Also known as:** buck2
- **Profile claimed by vendor:** no
- **Last updated:** 2026-08-26T19:27:31.521Z

## Vioscale score

**45.4 / 100**, confidence 22% (low). Computed 2026-09-01.

Composite of weighted, independently-sourced signals (no user reviews, no vendor payment).

| Signal | Score | Weight | Contribution | Evidence present |
|---|--:|--:|--:|:--:|
| capabilities | 0 | 0.07844444444444446 | 0 | - |
| repo_stars | 68.7 | 0.026 | 1.8 | ✓ |
| integrations | 20.1 | 0.07033333333333334 | 1.4 | ✓ |
| dependent_projects | 0 | 0.063 | 0 | ✓ |
| dev_activity | 63.1 | 0.094 | 5.9 | ✓ |
| release_cadence | 91.1 | 0.052 | 4.7 | ✓ |
| security_posture | 0 | 0.073 | 0 | - |
| package_downloads | 0 | 0.136 | 0 | - |
| security_score | 0 | 0.042 | 0 | - |
| community_qa_activity | 0 | 0.063 | 0 | - |

## About

Buck2 is a successor to the original Buck build system designed for fast, hermetic compilation of multi-language projects. It enforces strict dependency tracking to prevent common build errors and supports seamless interoperation between different programming languages like Python, OCaml, and Rust.

_Independently observed._

## Integrations (4)

_Independently observed._

- BuildBarn
- BuildBuddy
- EngFlow
- NativeLink

## Release history

| Version | Date | Type |
|---|---|---|
| [latest](https://github.com/facebook/buck2/releases/tag/latest) | 2023-04-13 | prerelease |
| [2026-08-22](https://github.com/facebook/buck2/releases/tag/2026-08-22) | 2026-08-22 | prerelease |
| [2026-08-01](https://github.com/facebook/buck2/releases/tag/2026-08-01) | 2026-08-01 | prerelease |
| [2026-07-15](https://github.com/facebook/buck2/releases/tag/2026-07-15) | 2026-07-15 | prerelease |
| [2026-07-01](https://github.com/facebook/buck2/releases/tag/2026-07-01) | 2026-07-01 | prerelease |
| [2026-06-15](https://github.com/facebook/buck2/releases/tag/2026-06-15) | 2026-06-15 | prerelease |
| [2026-06-01](https://github.com/facebook/buck2/releases/tag/2026-06-01) | 2026-06-01 | prerelease |
| [2026-05-18](https://github.com/facebook/buck2/releases/tag/2026-05-18) | 2026-05-18 | prerelease |
| [2026-05-01](https://github.com/facebook/buck2/releases/tag/2026-05-01) | 2026-05-01 | prerelease |
| [2026-04-15](https://github.com/facebook/buck2/releases/tag/2026-04-15) | 2026-04-15 | prerelease |
| [2026-04-01](https://github.com/facebook/buck2/releases/tag/2026-04-01) | 2026-04-01 | prerelease |
| [2026-03-15](https://github.com/facebook/buck2/releases/tag/2026-03-15) | 2026-03-15 | prerelease |
| [2026-03-11](https://github.com/facebook/buck2/releases/tag/2026-03-11) | 2026-03-11 | prerelease |
| [2026-02-01](https://github.com/facebook/buck2/releases/tag/2026-02-01) | 2026-02-01 | prerelease |
| [2026-01-19](https://github.com/facebook/buck2/releases/tag/2026-01-19) | 2026-01-19 | prerelease |

_… and 5 earlier release(s)._

## Security & compliance


Known vulnerabilities: 0 (0 in the last 12 months) ([source](https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=cargo&package_name=pagable_storage&per_page=100)). A count reflects scale and disclosure, not quality.

## Facts

Every value below carries its source and our confidence. Facts are re-crawled on a freshness schedule.

### integrations

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| integrations.count | 4 | [link](https://buck2.build) | 2026-08-19 | 60% (medium) |

### adoption

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| adoption.github_stars | 4,406 | [link](https://github.com/facebook/buck2) | 2026-08-26 | 90% (high) |
| adoption.dependent_repos | 0 | [link](https://packages.ecosyste.ms/api/v1/packages/lookup?repository_url=https%3A%2F%2Fgithub.com%2Ffacebook%2Fbuck2) | 2026-08-26 | 85% (high) |

### language

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| language.primary | Rust | [link](https://github.com/facebook/buck2) | 2026-08-26 | 90% (high) |

### license

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| license.spdx | Apache-2.0 | [link](https://github.com/facebook/buck2) | 2026-08-26 | 95% (high) |

### release

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| release.cadence_days | 16 | [link](https://github.com/facebook/buck2/releases) | 2026-08-26 | 70% (medium) |

### activity

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| activity.commits_last_30d | 100 | [link](https://github.com/facebook/buck2/pulse) | 2026-08-26 | 65% (medium) |

### security

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=cargo&package_name=pagable_storage&per_page=100","last_12m":0,"max_severity":null}` | [link](https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=cargo&package_name=pagable_storage&per_page=100) | 2026-08-26 | 90% (high) |

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*Source: Vioscale (https://www.vioscale.ai/software/buck2). Independent, evidence-based software intelligence. Cite the canonical URI.*