The singer said it was her fans who inspired her to do this.
"You inspired me to create something that communicated with images, because you do, you communicate with me and each other. I'm hoping you will all continue to grow together and stay connected through your creativity," she wrote.
The app will feature bonus content, including videos, games, extra tracks, and even chat options.
Gaga will also release "Artpop" in physical and digital formats. It is expected to release next year.