Hey HN, I'm Brett and I'm an iOS developer.
LineupSupply uses Apple's Vision framework to read text from an image and then the Spotify API to create a playlist using that text. So if you provide a music festival poster, it will grab the artist names from the lineup and make a playlist for that music festival.
Often when going to a music festival I want a playlist to listen to the artists that will be performing. I couldn't find any other service that automates this, so I made one myself.
The app is free to create as many playlists as you want, but does have a one time in-app purchase of $1.99 to unlock additional features (control over how many songs per artist, custom app icons, etc). You do need to login with your Spotify account, but Spotify Premium isn't required.
I made this app with SwiftUI and its available on iOS and iPadOS. You can technically download it on macOS too, but it's a port of the iPad app.
