Participants/volunteers clicking a SignUp link from a smartphone will automatically be routed to a SignUp experience designed for small screens and NEVER need to download the SignUp app.
The iPhone and Android apps, SignUp by SignUp.com, are ad-free, pro-convenience apps designed to give Organizers quick access to their SignUps. Occasionally, super-active Participants choose to purchase the app to access to all their SignUps in one place.
Check the Apple App Store or Google Play Store for more information.