The offline first, multilingual audio tour app built with Expo

Kuratour is a multilingual, GPS-powered audio tour app built entirely with Expo that won the 2025 Innovation Award in Adventure Tourism. The post details how the team implemented an offline-first architecture using expo-file-system and expo-sqlite to cache maps, audio, and images for use without connectivity. It covers building a layered audio engine with expo-audio for cinematic narration over ambient tracks, high-accuracy GPS triggers via expo-location for hands-free tour activation, and a content validation bridge using expo-application to handle iOS update file path issues. The post also explains how Kuratour scales as a white-label platform for tour operators using a single codebase with dynamic app.config.js generation and a theme engine to produce custom-branded apps per operator.