언제했지

This is an app designed to help you remember things you don't necessarily have to, but occasionally think about—like, "When did I do that?" For example:

I don't go to the golf course often, so when was the last time I went...

I go to the hair salon occasionally, but when was the last time...

When did I get my car hand-washed...

When did I buy these shoes I'm wearing...

I don't drink much, so when was the last time I had a drink...

When did the last new member join our group...

When was the last time I made a contribution...

Like this, it is an app that records things you do irregularly but end up doing again, allowing you to know when you did them in the past.