Good memory is useful, but as the Chinese saying goes, even the best memory is not as reliable as writing it down. External Memory turns your iPhone and Apple Watch into a backup for your brain: capture fleeting thoughts, places, tasks, and recurring reminders by voice or text, then find them when they matter. Use Voice Notebook for undated memories, flexible cycles for routines, Siri, widgets, calendar sync, and on-device privacy by default. Free to start, with a one-time Pro Lifetime upgrade.