When you're at your eclipse-viewing hub, the app will register your location and automatically start shooting 15 seconds before totality begins. The app will continue snapping pictures throughout the eclipse and into the beautiful "diamond ring" period at the end of totality. That means you can watch the eclipse under beautiful, clear skies while your phone does the work for you. (There's even a practice mode if you want to try it out before the big moment.)
The app will goes out of its way to remind you to take off your filter once totality starts and then it'll issue a reminder to replace your filter when totality is concluding so you don't fry the hell out of your camera.
"It’s really an experiment in using crowd-sourcing to do solar science, which will hopefully pave the way for much future work," solar physicist Juan Carlos Martínez Oliveros told UC Berkley News. "The app is going to do everything for you, so you just need to enjoy the eclipse."