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Heatstroke risk cannot be judged by air temperature alone. At the same temperature, higher humidity means higher risk, which is why the Wet Bulb Globe Temperature (WBGT), calculated from temperature, humidity, and radiant heat, is the international standard for heatstroke prevention. However, publicly available WBGT data in Japan focuses on current values, with few easy ways to check several days ahead. This made it difficult for outdoor workers, event organizers, and everyday users to prepare before dangerous heat arrives.
Built with Flutter as a cross-platform app for both iOS and Android. The backend is powered by Django REST Framework, and a machine learning model based on the Temporal Fusion Transformer (TFT) predicts hourly WBGT values across Japan up to 7 days ahead, using weather data and Ministry of the Environment observations. The app requires no registration: it offers a nationwide risk map, address-based location search, and hourly forecast graphs combined with temperature and weather. Four risk levels (Normal / Caution / Severe Caution / Stop Work) are displayed intuitively with colors and emoji. Push notifications via Firebase Cloud Messaging alert users about 3 hours before a favorite location reaches dangerous heat levels.
Released on both the App Store and Google Play as an in-house product. The app delivers machine-learning-based WBGT forecasts up to 7 days ahead in a form anyone can use instantly without registration, supporting everything from daily heatstroke prevention to safety management at outdoor work sites. For businesses, registered job sites receive automatically updated 7-day forecasts and alert notifications, supporting regulatory heatstroke countermeasures at construction sites and other workplaces.
App Store / Google Play公開中