# callstack/react-native-bundle-visualizer

See what packages are increasing your react-native bundle size 📦

Repository: https://github.com/callstack/react-native-bundle-visualizer
Canonical: https://ross.abutalabs.com/products/react-native-bundle-visualizer
License: MIT
License Family: permissive
Topics: react-native, bundle-size, bundle-visualizer, expo
Last push: 2026-05-27T09:14:57+00:00

## Health v2 (maintenance only)
Score: 84/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 84, release rhythm 75, longevity 100
- inputs: {"age_days": 3287, "days_push": 98, "days_rel": 167, "gap_med": 0, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1631, forks 50 (observed 2026-08-28T04:05:14.040151+00:00)

## What it is
A CLI tool that visualizes the contents of a React Native JavaScript bundle using source-map-explorer on Metro bundler output. It helps developers identify which packages or libraries are inflating their app's bundle size.

## Use cases
- find out which npm packages are making my react-native bundle huge
- visualize react-native bundle size breakdown
- reduce app loading time by identifying heavy javascript dependencies
- analyze bundle size for an expo project
- see what's inside my metro bundler output
- compare bundle size before and after removing a library

## When to choose
- you develop React Native or Expo apps and want to optimize bundle size
- you need a quick npx-runnable analysis without project configuration
- you want a visual treemap of which dependencies contribute most bytes

## When to avoid
- you need bundle analysis for plain web apps (use webpack-bundle-analyzer instead)
- you need native binary size analysis rather than JavaScript bundle analysis
- your project does not use Metro as its bundler

## Facets
- artifact type: cli-tool
- maturity: active
- function: developer-tools, build-tool, data-visualization
- domain: developer-tools, mobile-development, frontend
- platform: cli, cross-platform
- tags: react-native, expo, bundle-size, source-map-explorer, metro-bundler, performance, nodejs

## Member repositories
- callstack/react-native-bundle-visualizer (main) score 84

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:14.040151+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:47:49.937935+00:00, confidence not recorded.
  - readme: https://github.com/callstack/react-native-bundle-visualizer (fetched 2026-08-28T04:05:14.040151+00:00, sha f66d03d4e27d)
- Data as of 2026-08-30T08:39:29.467469+00:00.