Flashback is a free iOS app that turns idle scroll time into something worth remembering. Every card is a real person or event that shaped the world — told in plain language. 1,800+ cards from 15+ countries. A new Today in History card pinned every morning. 50 Deep Dive long-form articles (WWII, Genghis Khan, Fall of Rome). Daily 7 PM history reminder. No accounts. Works offline. Free. History worth knowing.