Pushain is a push-notification-first motivation app for tight-knit groups. When you start an activity — studying, working out, writing, anything — your entire group gets a real-time push notification. That one signal often starts a chain reaction. No feed. No likes. No doomscrolling. Just a single tap to say "I'm starting" and watch your crew follow. Built on information cascade theory: one person's action lowers the barrier for everyone else in the group.