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Bundlephobia

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Analyze the size and performance cost of npm dependencies for your JavaScript bundle.

Developer ToolsTesting & QAUI/UX Design
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Tracked since2026
0 reviews tracked

The Bottom Line

Entry price

Free, no paid tier

Biggest pro

Helps reduce bundle size and improve load times

Biggest con

Limited to npm packages

TL;DR - Bundlephobia

  • Analyzes the size of npm packages.
  • Helps optimize JavaScript bundle performance.
  • Scans individual packages or package.json files.
Pricing: Free forever
Best for: Individuals & startups

What is Bundlephobia?

Editorial review
Bundlephobia is a tool designed to help developers understand the impact of adding new npm packages to their JavaScript bundles. It provides insights into the size of a package, both minified and gzipped, and its overall performance cost. This helps developers make informed decisions about which dependencies to include, optimizing their application's load time and performance. The tool is ideal for front-end developers, full-stack developers, and anyone working with JavaScript projects that utilize npm packages. By quickly scanning individual packages or an entire package.json file, Bundlephobia helps identify potential performance bottlenecks before they are integrated into a project, leading to more efficient and faster web applications.

Available on: Web

how we evaluateSourcebundlephobia.com ↗

Pros & Cons

Pros

  • Helps reduce bundle size and improve load times
  • Easy to use interface for quick analysis
  • Supports both individual package and project-level analysis
  • Free to use

Cons

  • Limited to npm packages
  • Does not analyze custom code or local dependencies

Key Features

Analyze individual npm package sizeScan package.json files for multiple dependenciesDisplays minified size of packagesDisplays gzipped size of packagesProvides performance cost metrics

Pricing

Free

Bundlephobia is completely free to use with no hidden costs.

View pricing

Is Bundlephobia worth the price?

100/100

Bundlephobia offers a completely free service, which is incredibly generous given its utility for JavaScript developers.

There are no paid tiers, making it an accessible tool for everyone. This pricing model is best for individual developers, open-source contributors, and small teams looking for cost-free bundle analysis.

Hidden Costs & Gotchas

No overage fees or seat minimums.

Reviews

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Best Bundlephobia Alternatives

Top alternatives based on features, pricing, and user needs.

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unpkgFree

Instant CDN access to any npm package

4.1
Sourcegraph logo
SourcegraphFreemium

Search, understand, and manage code across all your repositories

4.2
Snyk logo
SnykFreemium

Secure your code, dependencies, containers, and IaC from dev to production

4.5
See all developer tools →

Still deciding?

Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

Bundlephobia vs unpkgHead-to-head: features, pricing, who winsBundlephobia vs SourcegraphHead-to-head: features, pricing, who winsBundlephobia vs SnykHead-to-head: features, pricing, who wins

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Bundlephobia FAQ

How does Bundlephobia help optimize web application performance?

Bundlephobia helps optimize web application performance by analyzing the size and performance cost of npm dependencies. It provides insights into a package's minified and gzipped size, enabling developers to make informed decisions that reduce bundle size and improve load times.

Which teams benefit most from using Bundlephobia?

Bundlephobia is ideal for front-end developers, full-stack developers, and any teams working with JavaScript projects that utilize npm packages. It helps these teams identify potential performance bottlenecks before they are integrated into a project.

How does Bundlephobia compare to unpkg?

Bundlephobia focuses on analyzing the size and performance cost of npm dependencies to help reduce bundle size, while unpkg primarily serves as a content delivery network for npm packages. Bundlephobia provides analytical insights, whereas unpkg delivers package files directly.

What kind of limitations should users be aware of when using Bundlephobia?

Users should be aware that Bundlephobia is limited to analyzing npm packages. It does not analyze custom code or local dependencies within a project, focusing solely on the impact of third-party npm packages.

Does Bundlephobia include a free tier?

Bundlephobia is entirely free to use, with no paid plans or subscriptions required. This allows all developers to access its features for analyzing npm package performance without cost.

Can Bundlephobia analyze an entire project's dependencies?

Yes, Bundlephobia supports project-level analysis by scanning an entire package.json file. This allows developers to assess the collective impact of all their project's npm dependencies.

Source: bundlephobia.com

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