The app is loosely based on Keys' relationship with her grandmother. It's centered in LeeLee's bedroom, and it allows users to read books, play music and write in a journal.
"It does remind me of my world," the New York-born singer said. "The piano, the journal, music's such a big part of my life, the city, all of that."
Keys is launching the app through her company AK Worldwide and Bento Box Interactive. She said raising her 2-year-old son, Egypt, was part of the app's inspiration.
"I was just getting introduced to kind of the TV shows and the DVDs and all the things you start kind of introducing your kids to, and I thought how cool it would be to be a part of something that really allows them to hear music from different places, different cultures, different sounds," she said. "That's what we're able to do with this."
Keys is a 14-time Grammy winner. Her fifth album, "Girl On Fire," is out Nov. 27. Maxwell, Jamie xx, Bruno Mars and John Legend are among the featured acts and songwriters.
Follow Mesfin Fekadu on Twitter at http://twitter.com/musicmesfin.