Menu
[Flutter] Flutter code obfuscation guide. Build commands, symbol files, stack trace deobfuscation, and limitations. (project)
Install with Codex or Claude Copy this prompt, paste it into Codex, Claude, or another assistant, and let it review the skill page and install it for you.
Based on SOC occupation classification
| name | flutter-obfuscate-docs |
| description | [Flutter] Flutter code obfuscation guide. Build commands, symbol files, stack trace deobfuscation, and limitations. (project) |
Replaces function/class names with obscure symbols to make reverse engineering harder.
Warning: Obfuscation only renames symbols - it does NOT encrypt resources or provide strong security. Never store secrets in the app.
| Platform | Build Targets |
|---|---|
| Android | aar, apk, appbundle |
| iOS | ios, ios-framework, ipa |
| Desktop | linux, macos, macos-framework, windows |
| Web | Not supported (uses minification instead) |
flutter build <target> \
--obfuscate \
--split-debug-info=<symbols-directory>
# Android APK
flutter build apk --obfuscate --split-debug-info=out/android
# Android App Bundle
flutter build appbundle --obfuscate --split-debug-info=out/android
# iOS
flutter build ios --obfuscate --split-debug-info=out/ios
# iOS IPA
flutter build ipa --obfuscate --split-debug-info=out/ios
# macOS
flutter build macos --obfuscate --split-debug-info=out/macos
# Windows
flutter build windows --obfuscate --split-debug-info=out/windows
# Linux
flutter build linux --obfuscate --split-debug-info=out/linux
Important: Backup the generated symbol files!
Generated in <symbols-directory>:
out/android/
├── app.android-arm.symbols
├── app.android-arm64.symbols
└── app.android-x64.symbols
Always backup these files - required for crash report deobfuscation.
flutter symbolize -i <stack-trace-file> -d <symbols-file>
# Save crash stack trace to file
echo "crash stack trace content" > crash.txt
# Deobfuscate
flutter symbolize -i crash.txt -d out/android/app.android-arm64.symbols
Creates JSON mapping of original → obfuscated names:
flutter build apk \
--obfuscate \
--split-debug-info=out/android \
--extra-gen-snapshot-options=--save-obfuscation-map=out/android/map.json
Output (map.json):
["MaterialApp", "ex", "Scaffold", "ey", "MyWidget", "ez", ...]
// BAD: Runtime type checking fails after obfuscation
expect(foo.runtimeType.toString(), equals('Foo')); // ❌
// BAD: Type name comparison
if (widget.runtimeType.toString() == 'MyWidget') { } // ❌
| Task | Command |
|---|---|
| Build obfuscated APK | flutter build apk --obfuscate --split-debug-info=out/android |
| Build obfuscated IPA | flutter build ipa --obfuscate --split-debug-info=out/ios |
| Deobfuscate crash | flutter symbolize -i crash.txt -d app.android-arm64.symbols |
| Generate map | Add --extra-gen-snapshot-options=--save-obfuscation-map=map.json |
| Check options | flutter build <target> -h |
1. Build with --obfuscate --split-debug-info=<dir>
2. Backup symbol files (*.symbols)
3. Distribute obfuscated app
4. When crash occurs: flutter symbolize -i <crash> -d <symbols>
[Utility] Analyzes user prompts and efficiently loads only relevant rule documents. Auto-generates category-document mapping config file on first invocation by scanning project documents. Supports both automatic and manual invocation. (project)
[Dev] Extracts and organizes best practices for a given topic into a minimal tree structure (max depth 3, max 5 children per node). Use during task planning when writing subtasks in Docs/{name}_Task.md - output is added under each subtask as a concise reference guide. Pure reasoning task with strict formatting rules: keywords/noun phrases only, no prose. (project)
[Utility] Analyzes user prompts and efficiently loads only relevant rule documents. Auto-generates category-document mapping config file on first invocation by scanning project documents. Supports both automatic and manual invocation. (project)
[Design System] Quantitative accessibility audit for UI - contrast ratios, font sizes, tap targets, heading hierarchy. Use when (1) checking WCAG color contrast compliance, (2) auditing text sizes for readability, (3) validating touch/click target sizes, (4) reviewing heading structure and landmarks, (5) user asks to 'check accessibility', 'audit contrast', 'WCAG compliance', or 'a11y check'.
[Aesthetics] Positions aesthetics within art/design history, identifies what traditions it echoes, and spots clichés, generic trends, and AI-slop patterns to avoid. Outputs Critical Notes as Memo nodes in Brain canvas.
[Aesthetics] Maps aesthetic briefs to cultural references: art movements, photography, film, architecture, music, fashion. Outputs reference lists with visual language analysis. Organizes findings as Image and Memo nodes in Brain canvas.