chatbot4 gemini-api4 openai-api4 audio-generation3 cross-platform3 dark-theme3 light-theme3 react-native3 text-generation3 ui-kitten3 ai2 expo2 expo-sdk2 generative2 image-generation2 admob1 ai assistant1 android app1 developer-friendly1 flashcards1 flutter1 generative-ai1 ios1 ios app1 ocr1 pdf1 quiz1 study1 theme-customization1 versatile-components1