SpotifyPlaylistImport
Mac app written in Swift that reads an XML iTunes playlist export, searches for the songs on Spotify and puts the song URIs in the clipboard
To use it, export your iTunes playlist to XML (File > Library > Export Playlist) and select it within the app. Once it fetched all the track URIs, the whole thing will be copied to your clipboard so it can easily be pasted in Spotify
Spotify allows drag and drop of songs from iTunes but in some cases this app will do it better.
It is quite buggy right now. Contributions and pull requests are more than welcome. The main purpose of this app was to learn Swift and it solved a problem for me with Spotify.