Bundlephobia
Claim this toolAnalyze the size and performance cost of npm dependencies for your JavaScript bundle.
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Tracked since2026
0 reviews trackedThe 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?
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
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.
Reviews
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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