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Wishtohear
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flutter-reducing-app-size

Measures and reduces Flutter application bundle size using build analysis and optimization workflows.

1|Updated Apr 30, 2026
Search Tags:#devtools#tree-shaking#flutter#app size#bundle optimization#release build#app thinning
One-click install
npx skills add https://github.com/Wishtohear/bucket-water-oms --skill flutter-reducing-app-size-wishtohear
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: flutter-reducing-app-size
Source: https://github.com/Wishtohear/bucket-water-oms/tree/main/bucket-water-oms-admin-mobile/skills/flutter-reducing-app-size
Command: npx skills add https://github.com/Wishtohear/bucket-water-oms --skill flutter-reducing-app-size-wishtohear

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Flutter apps often ship with bloated binaries due to unused code, oversized assets, and unoptimized dependencies, leading to large download sizes that hurt install rates and violate app store package constraints. ## Core Features & Use Cases - Size Analysis Generation: Produces *-code-size-analysis_*.json files via the --analyze-size build flag for Android, iOS, and desktop targets. - DevTools Visualization: Guides inspection of the size treemap in Dart DevTools, including diffing builds to verify reductions. - iOS Download Size Estimation: Walks through Xcode App Thinning reports to project real per-device download and install sizes. - Reduction Strategies: Covers splitting debug info, obfuscation, removing unused assets, and compressing media. - Use Case: Before releasing a Flutter app to the Play Store, run flutter build appbundle --analyze-size, inspect the JSON in DevTools, identify an oversized icon package, replace it, and confirm the size drop with the Diff tab. ## Quick Start Ask the assistant to analyze the Flutter app's bundle size and suggest concrete steps to reduce the release build footprint.

Frequently Asked Questions about flutter-reducing-app-size

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I analyze Flutter app size?▼

Run a release build with the --analyze-size flag, such as flutter build appbundle --analyze-size. This generates a *-code-size-analysis_*.json file in the build directory that breaks down byte size by package, library, class, and function.

How to reduce Flutter app size for release builds?▼

Build with --obfuscate and --split-debug-info to strip symbols, remove unused assets and fonts from pubspec.yaml, replace heavy third-party packages, and compress PNG/JPEG assets with tools like pngquant or WebP conversion.

Why is my Flutter debug build so large?▼

Debug builds include VM overhead and lack AOT compilation and tree-shaking, so they do not reflect real app size. Always measure size using profile or release builds, which remove unreachable code automatically.

Does the APK upload size equal the user download size?▼

No. App stores filter redundant native library architectures and asset densities per device, so end-user downloads are smaller. For iOS, use the Xcode App Thinning Size Report to see accurate per-device compressed and uncompressed sizes.

How do I compare Flutter app size between two builds?▼

Generate size analysis JSON files for both builds, then open Dart DevTools with dart devtools, launch the app size tool, and use the Diff tab to compare the two snapshots and identify what grew or shrank.

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