💡 Pick it for the most established web-based npm package size comparisons.
BundlePhobia is a tool that helps you find the cost of adding a npm package to your bundle.
Best bundlejs Alternatives ranked by AI · updated Aug 2026
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bundlejs is a browser-based tool for estimating the bundled size of JavaScript and npm packages. It is aimed at developers comparing dependencies, with tree-shaking and compression estimates for individual imports.
Top 6 bundlejs alternatives
2
Package Phobia
Package Phobia
💡 Pick it when npm install size and package history matter more than tree-shaken bundle estimates.
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
3
Size Limit
Alexey Kachkaev and contributors
💡 Pick it to enforce bundle-size budgets in CI instead of checking packages manually.
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
💡 Pick it when you need an interactive treemap of an existing webpack application bundle.
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
💡 Pick it to trace bytes in a built bundle back to the original source files.
Source Map Explorer analyzes JavaScript bundles using the source maps.
Pros
- Identifies code bloat
- Visualizes dependency tree
Cons
- Focused on JavaScript bundles
- Requires source maps
6
Import Cost
Wix
💡 Pick it for inline import-size feedback while working in a supported code editor.
Import Cost is an open-source editor extension that displays the size of imported JavaScript and TypeScript packages inline. It is aimed at...
Pros
- Displays dependency cost directly beside imports while coding
- Provides immediate feedback without leaving the editor
- Supports popular editors through extension integrations
Cons
- Requires editor installation and project setup
- Less suitable for browsing and comparing packages independently
- Estimates depend on the configured bundler and package resolution
Free, open source
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