This app should work without an internet connection as long as you keep its window open. For the best experience, add it to your home screen. This will install a minimal version of the app with its own icon, just like a regular mobile app. We believe this is better suited for your festival-level cognitive load and will help save your phone’s battery. (If it fails, please try again with a better internet connection.)
On iOS, tap the Share button, scroll down, and select 'Add to Home Screen'. (If you opened this link from Telegram, the option won’t appear — copy the link and open it in Safari.)