What is the name of the app that will tell you what you would look like with a different hairstyle?

The app you're looking for is likely "YouCam Makeup." This app allows users to try on various hairstyles and colors virtually, along with makeup options. Another popular option is "Hairstyle Magic," which also provides users with the ability to experiment with different looks. Both apps use augmented reality technology to give a realistic preview of different hairstyles.