BundlePhobia is a tool that helps you find the cost of adding a npm package to your bundle.
Best Size Limit Alternatives ranked by AI · updated Aug 2026
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Size Limit is an open-source JavaScript performance tool for measuring and enforcing bundle-size budgets. It is aimed at teams and libraries that want size checks in local development and continuous integration.
Top 6 Size Limit 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
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
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
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
Import Cost
Wix
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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