The OneTap Digital Check-in App offers a customizable check-in process that accommodates people without smartphones, those who forget them, or have difficulty using them. It features a unique 1-800 toll-free number check-in method. Visitors send their unique check-in code via this number, and if their profile is registered with their phone number, they can complete the check-in process through SMS. This provides a simple and straightforward solution for users who prefer or need an alternative to smartphone-based check-ins.