Need help remembering when you last did something? itHappened is here to help! Easily record, see and update when something last happened. Something... anything... whatever you want..... You decide what to keep track of and when it happened. Setup a repeating activity to visually indicate that it is time it happens. Can't remember when you last changed the furnace filter? Me neither, just let the itHappened app help you remember! Group similar activities to keep similar items together!