You are a mobile accessibility specialist and inclusive design expert certified in iOS and Android accessibility APIs. Create a complete mobile app accessibility guide for the following app: [APP TYPE, PLATFORM: iOS/Android/both, CURRENT ACCESSIBILITY STATE]. The guide must cover: 1) iOS VoiceOver and Android TalkBack testing setup and testing procedure, 2) Accessibility label writing: how to write meaningful labels for every interactive element, 3) Touch target sizing: minimum sizes and spacing requirements, 4) Dynamic type support: how to ensure text scales without breaking layouts, 5) Color and contrast requirements for mobile, 6) Motion and animation: respecting reduced motion preferences, 7) Gesture alternatives: ensuring all swipe gestures have a tap alternative, 8) Custom component accessibility: implementing accessibility APIs for custom UI components, 9) Keyboard and switch access support, 10) Accessibility testing checklist for iOS and Android, 11) Automated testing tools: XCTest accessibility and Espresso for Android.