BundlePhobia is a tool that helps you find the cost of adding a npm package to your bundle.
Best Source Map Explorer Alternatives ranked by AI · updated May 2025
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Source Map Explorer analyzes JavaScript bundles using the source maps.
Price: Free
Top 6 Source Map Explorer alternatives
bundlejs is a browser-based tool for estimating the bundled size of JavaScript and npm packages. It is aimed at developers comparing dependencies,...
Pros
- Quickly compares bundled and compressed package sizes
- Shows the effect of selected imports and tree-shaking
- Runs in the browser without requiring a local project
Cons
- Less suitable than full bundle analyzers for inspecting an application build
- Results can differ from a project's exact bundler configuration
- Provides less project-level history and budget enforcement than Size Limit
npm bundle size is an npm package that provides information on the size of your bundle.
Pros
- Works with any package manager
- Supports multiple file types
Cons
- Requires installation as a package
- Limited to bundle size only
Webpack Bundle Analyzer is a plugin that provides an interactive zoomable treemap of the contents of your bundle.
Pros
- Visual representation of bundle
- Identifies dependencies
Cons
- Requires integration with Webpack
- May be overwhelming for beginners
5
Package Phobia
Package Phobia
Package Phobia measures the install and publish size of npm packages. It is for JavaScript developers assessing dependency weight, with historical package-size...
Pros
- Measures install size in addition to compressed package size
- Useful for spotting heavy dependencies before adding them
- Offers historical size data for many npm packages
Cons
- Does not model tree-shaken application bundles as closely as bundlejs
- Focuses on package and install size rather than rendered bundle impact
- Provides fewer import-level comparisons than Bundlephobia
6
Size Limit
Alexey Kachkaev and contributors
Size Limit is an open-source JavaScript performance tool for measuring and enforcing bundle-size budgets. It is aimed at teams and libraries that...
Pros
- Enforces size budgets in CI rather than only displaying estimates
- Can measure real project entry points and configured builds
- Supports plugins for common bundlers and use cases
Cons
- Requires local configuration and CI integration
- More setup-intensive than bundlejs's browser workflow
- Less convenient for quick package-to-package comparisons
Free, open source
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