Comparison

JSR vs uv

On the evidence we track, uv leads this comparison with a composite score of 67/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

JSR full profile →uv full profile →

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JSR47

★uv67

Attribute comparison across 2 tools
Attribute	JSR	uvLeader
Vioscale score	47 / 100low · 46%	67 / 100high · 76%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	commercial	commercial
Price levelpricing.price_level	free	free
Transparentpricing.transparent	✓	-
Integrations
Countintegrations.count	6	17
Security
Scorecardsecurity.scorecard	5.4	-
Vulnerabilitiessecurity.vulnerabilities	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fjsr-io%2Fjsr&per_page=100 · Last 12m: 0	Count: 5 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=uv&per_page=100 · Last 12m: 4 · Max severity: MODERATE
Adoption
Dependent reposadoption.dependent_repos	0	2
Github starsadoption.github_stars	2,969	89,118
Package downloads weeklyadoption.package_downloads_weekly	-	44,329,091
Activity
Commits last 30dactivity.commits_last_30d	48	100
Release
Cadence daysrelease.cadence_days	-	3
Historyrelease.history	-	20 items
License
Spdxlicense.spdx	MIT	Apache-2.0
Language
Primarylanguage.primary	Rust	Rust
Market
Availabilitymarket.availability	Available worldwide	-

Score

Vioscale score

JSR47 / 100low · 46%

uv67 / 100high · 76%

Pricing

Free tier

JSR✓

uv✓

Model

JSRcommercial

uvcommercial

Price level

JSRfree

uvfree

Transparent

JSR✓

uv–

Integrations

Count

JSR6

uv17

Security

Scorecard

JSR5.4

uv–

Vulnerabilities

JSRCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fjsr-io%2Fjsr&per_page=100 · Last 12m: 0

uvCount: 5 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=uv&per_page=100 · Last 12m: 4 · Max severity: MODERATE

Adoption

Dependent repos

JSR0

uv2

Github stars

JSR2,969

uv89,118

Package downloads weekly

JSR–

uv44,329,091

Activity

Commits last 30d

JSR48

uv100

Release

Cadence days

JSR–

uv3

History

JSR–

uv20 items

License

Spdx

JSRMIT

uvApache-2.0

Language

Primary

JSRRust

uvRust

Market

Availability

JSRAvailable worldwide

uv–

Capabilities

Feature-by-feature on the axes that matter for package registries. “-” means undocumented, not absent.

Capability comparison for Package Registries
Capability	JSR	uv
Core
Role	Public registry	Package manager client
Ecosystem
Ecosystem / language	Polyglot	Python
Deployment
Deployment	SaaS	CLI-local
Formats
Package formats supported	Single ecosystem	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

Core

Role

JSRPublic registry

uvPackage manager client

Ecosystem

Ecosystem / language

JSRPolyglot

uvPython

Deployment

JSRSaaS

uvCLI-local

Formats

Package formats supported

JSRSingle ecosystem

uvMany formats

Hosting

Private / scoped packages

JSR✓

uv-

Upstream proxy / caching

JSR-

uv-

Resolution

Lockfile / deterministic installs

JSR-

uv✓

Workspaces / monorepo

JSR-

uv✓

Content-addressable store

JSR-

uv-

Supply chain

Supply-chain integrity

JSR✓

uv✓

Vulnerability / licence scanning

JSR-

uv-

Licensing

Openness

JSROpen-source

uvOpen-source

Pricing

Pricing model

JSRFree / OSS

uvFree / OSS

What each one is

The product in its own terms, so the numbers below have context.

JSR

An open-source package registry for JavaScript and TypeScript that publishes ECMAScript modules natively. It works across multiple JavaScript runtimes including Node.js, Deno, Bun, and Cloudflare Workers, with built-in TypeScript support, automatic documentation generation, and interoperability with npm packages.

Independently observed

uv

Leader

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.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

JSR

FreeFree tier

Free and open-source

PublicFree
- Publish packages
- ECMAScript modules
- Automatic API documentation
- TypeScript support
- Cross-runtime compatibility

as of 2026-08-14verify ↗

uv

Leader

Open sourceFree tier

as of 2026-08-14verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platform and deployment support comparison
Supports	JSR	uv
WebPlatforms	✓	✗
macOSPlatforms	✗	✓
WindowsPlatforms	✗	✓
LinuxPlatforms	✗	✓
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✓	✗
Self-hostedDeployment	✓	✓

Platforms

Web

JSR✓

uv✗

macOS

JSR✗

uv✓

Windows

JSR✗

uv✓

Linux

JSR✗

uv✓

CLI

JSR✓

uv✓

Deployment

Cloud / SaaS

JSR✓

uv✗

Self-hosted

JSR✓

uv✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

JSR

6 total

Node.js
Deno
Bun
Cloudflare Workers
npm
Algolia

Independently observed

uv

Leader

10 total

Docker
GitHub Actions
GitLab CI/CD
AWS Lambda
Azure Artifacts
AWS CodeArtifact
JFrog Artifactory
PyTorch
FastAPI
Jupyter

Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.