The announcement was made via a "first look" video posted to the "Bad Blood" hitmaker's YouTube account, in which she speaks to a camera to tell her fans she has "something pretty awesome" to share.
She added: "I think you guys are really going to like this. I mean - I hope. It would be preferable if you did."
According to the video, the app will be available to download from the Apple App Store and Google Play Store later this year. It is still unknown whether it will be free to download.
The video's description read: "A creative, inclusive and community-driven place for users to better connect with each other... and Taylor! Coming late 2017.