Mobile App Debugging

Covers the essentials for debugging iOS, Android, and React Native apps when you're hunting crashes, memory leaks, or performance problems. You get quick references for Xcode's LLDB commands, Android Studio's Logcat filtering, and React Native's remote debugging setup. The memory debugging section points you to the right tools like Memory Graph Debugger and Android's Memory Profiler. I appreciate the debug checklist reminding you to test on actual devices and simulate slow networks, since those are easy to skip when you're rushing. The performance targets are reasonable baselines, though your app's constraints might differ. Good starting point when you need to move fast across platforms.

skills.sh installs: 439
GitHub stars: 248
last updated: Aug 21, 2026

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Install

$ npx -y skills add secondsky/claude-skills --skill mobile-app-debugging --agent claude-code

Installs into .claude/skills of the current project.

Files

Mobile App Debugging

Debug mobile applications across iOS, Android, and cross-platform frameworks.

iOS Debugging (Xcode)

// Breakpoint with condition
// Right-click breakpoint > Edit > Condition: userId == "123"

// LLDB commands
po variable          // Print object
p expression         // Evaluate expression
bt                   // Backtrace

Memory Debugging

Use Memory Graph Debugger to find retain cycles
Enable Zombie Objects for use-after-free bugs
Profile with Instruments > Leaks

Android Debugging (Android Studio)

// Logcat filtering
Log.d("TAG", "Debug message")
Log.e("TAG", "Error", exception)

// Filter: tag:MyApp level:error

Common Issues

ANR: Check main thread blocking
OOM: Profile with Memory Profiler
Layout issues: Use Layout Inspector

React Native

// Remote debugging
// Shake device > Debug JS Remotely

// Console logging
console.log('Debug:', variable);
console.warn('Warning');
console.error('Error');

// Performance Monitor
// Shake > Show Perf Monitor
// Target: 60 FPS, <16ms per frame