When the user wants to set up, improve, or audit analytics tracking and measurement. Also use when the user mentions "set up tracking," "GA4," "Google Analytics," "conversion tracking," "event tracking," "UTM parameters," "tag manager," "GTM," "analytics implementation," "tracking plan," "how do I measure this," "track conversions," "attribution," "Mixpanel," "Segment," "are my events firing," or "analytics isn't working." Use this whenever someone asks how to know if something is working or wants to measure marketing results. For A/B test measurement, see ab-test-setup.
Complete guide for building beautiful apps with Expo Router. Covers fundamentals, styling, components, navigation, animations, patterns, and native tabs.
Set up Tailwind CSS v4 in Expo with react-native-css and NativeWind v5 for universal styling
Production animation patterns for React Native using Reanimated 4, Skia, WebGPU, and TypeGPU. Covers CSS transitions, CSS animations, shared value animations, canvas animations with react-native-skia, GPU shader animations, layout animations, scroll-driven animations, interpolation, particle systems, procedural noise, SDF rendering, performance tuning, and accessibility. Trigger on: Reanimated, useSharedValue, useAnimatedStyle, withSpring, withTiming, withDecay, withRepeat, withSequence, CSS transition, CSS animation, layout animation, FadeIn, SlideIn, ZoomIn, LinearTransition, keyframe, interpolate, scrollTo, useFrameCallback, react-native-skia, Skia Canvas, Atlas, usePathInterpolation, usePathValue, useClock, useTexture, SKSL, interpolateColors, Picture API, canvas animation, sprite animation, WebGPU, react-native-wgpu, TypeGPU, GPU shader, WGSL, particle system, Perlin noise, SDF, Three.js, react-three-fiber, animation performance, or any request to animate UI in React Native.
Software Mansion's best practices for audio in React Native using react-native-audio-api. Covers audio playback (buffer sources, oscillators, streaming), recording (file, callback, graph), audio effects (gain, filters, delay, convolver, panner, waveshaper), real-time analysis and visualization, audio worklets (custom synthesis, UIRuntime/AudioRuntime), system integration (sessions, interruptions, permissions), and testing. Trigger on: react-native-audio-api, AudioContext, AudioRecorder, AudioBuffer, AudioBufferSourceNode, AudioBufferQueueSourceNode, OscillatorNode, StreamerNode, GainNode, BiquadFilterNode, DelayNode, ConvolverNode, StereoPannerNode, WaveShaperNode, AnalyserNode, AudioParam, AudioManager, PlaybackNotificationManager, RecordingNotificationManager, WorkletNode, WorkletSourceNode, WorkletProcessingNode, audio playback, record audio, microphone, waveform, audio visualization, audio streaming, audio worklet, or any React Native feature that captures, processes, or emits sound.
Software Mansion's best practices for gestures in React Native apps using React Native Gesture Handler. Use when implementing tap, pan, pinch, rotation, swipe, long press, fling, hover, drag, or any touch interaction. Trigger on: 'gesture handler', 'GestureDetector', 'tap gesture', 'pan gesture', 'pinch gesture', 'rotation gesture', 'long press', 'fling', 'hover gesture', 'swipe', 'pinch to zoom', 'drag', 'touch handling', 'Pressable', 'RectButton', 'Swipeable', 'DrawerLayout', 'VirtualGestureDetector', or any request to handle user touch input in a React Native app.
Software Mansion's best practices for multithreading in React Native apps using react-native-worklets. Use when running JavaScript on multiple threads, offloading heavy computation from the JS thread, communicating between runtimes, or sharing data across threads. Trigger on: 'worklet', 'worklets', 'react-native-worklets', 'runOnUI', 'runOnJS', 'scheduleOnUI', 'scheduleOnRN', 'scheduleOnRuntime', 'createWorkletRuntime', 'background thread', 'UI thread', 'worker runtime', 'Serializable', 'Synchronizable', 'multithreading', 'parallel execution', 'offload computation', 'background processing', 'Bundle Mode', or any request to move work off the JS thread in a React Native app.
Software Mansion's best practices for on-device AI in React Native using React Native ExecuTorch. Covers LLMs (chat, tool calling, structured output), computer vision (classification, object detection, OCR, segmentation, style transfer, embeddings, text-to-image), speech processing (speech-to-text, text-to-speech, voice activity detection), VisionCamera real-time frame processing, model loading and resource management. Trigger on: 'react-native-executorch', 'ExecuTorch', 'on-device AI', 'on-device ML', 'local AI', 'offline AI', 'useLLM', 'useClassification', 'useObjectDetection', 'useOCR', 'useVerticalOCR', 'useStyleTransfer', 'useTextToImage', 'useImageEmbeddings', 'useImageSegmentation', 'useSpeechToText', 'useTextToSpeech', 'useVAD', 'useTextEmbeddings', 'useTokenizer', 'useExecutorchModule', 'ResourceFetcher', 'real-time frame processing', 'runOnFrame', 'tool calling', 'structured output', or any request to run AI/ML models locally in a React Native app.