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"When Was It?" is an app that notifies you of regularly recurring daily activities—ranging from waking time, laundry, and friends' birthdays to calling your parents and the elapsed time for a water purifier filter replacement, either the day before or on the day itself.

Users can create notifications by inputting their own lifestyle patterns or utilize pre-made templates.

It requires no separate device connection, allowing for offline use, and since there is no membership registration, you can use it with peace of mind regarding personal information leaks.