PARTYPPL AS AN APP

No store needed. Same account, same tickets, also without internet.

iPhone / iPad (Safari)Tap Share (square with arrow) → 'Add to Home Screen' → Add. PartyPPL then opens fullscreen, with push notifications if you allow them.
Android (Chrome)Tap 'Install as app' above, or menu ⋮ → 'Install app'.
Mac / Windows (Chrome, Edge)Click the install icon on the right of the address bar, or use the button above.
Mac (Safari)File → 'Add to Dock'.