What is Bun?
Bun is a fast, incrementally adoptable all-in-one JavaScript, TypeScript & JSX toolkit. Use individual tools like bun test or bun install in Node.js projects, or adopt the complete stack with a fast JavaScript runtime, bundler, test runner, and package manager built in.
What Bun does
The capabilities that matter for package registries, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Role
- Package manager client
- Ecosystem / language
- JavaScript
- Deployment
- CLI-local
- Package formats supported
- -
- Private / scoped packages
- -
- Upstream proxy / caching
- -
- Lockfile / deterministic installs
- -
- Workspaces / monorepo
- -
- Content-addressable store
- -
- Supply-chain integrity
- -
- Vulnerability / licence scanning
- -
- Openness
- Open-source
- Pricing model
- Free / OSS
Platform & deployment
Independently observed- CLI
- macOS
- Linux
- Windows
Bun alternatives
Other package registries we track, ranked by the same independent score.
- uvAn extremely fast Python package and project manager, written in Rust.low · 40%
- pnpmFast, disk space efficient package managerlow · 28%
- pipThe package installer for Pythonlow · 26%
- HomebrewThe Package Manager for Everywherelow · 18%
- PoetryPython dependency management and packaging made easylow · 32%
- Verdacciolow · 34%
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Bun, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Package Downloads | 84 | 22.00 | 1849.3 | ✓ |
| Github Activity | 63 | 16.00 | 1009.6 | ✓ |
| Release Cadence | 91 | 10.00 | 905.6 | ✓ |
| Github Stars | 94 | 4.00 | 375.7 | ✓ |
| Price Level | 0 | 4.00 | 0.0 | - |
| Reliability | 0 | 8.00 | 0.0 | - |
| Capabilities | 0 | 14.00 | 0.0 | - |
| Integrations | 0 | 8.00 | 0.0 | - |
| Security Posture | 0 | 26.00 | 0.0 | - |
| Pricing Transparency | 0 | 6.00 | 0.0 | - |
| Stackoverflow Activity | 0 | 8.00 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 100 | mediumsource · 2026-08-03 · 65% |
Adoption
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | {"role":"manager_client","ecosystem":"js","deployment":"cli_local","open_source":"oss","pricing_model":"free"} | mediumsource · 2026-08-03 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Rust | highsource · 2026-08-03 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-08-03 · 85% |
Pricing
| Attribute | Value | Evidence |
|---|---|---|
| Model | commercial | lowsource · 2026-08-03 · 40% |
Release
| Attribute | Value | Evidence |
|---|---|---|
| Cadence days | 17 | mediumsource · 2026-08-03 · 70% |