If you want an AI-powered playlist generator that works with Spotify, Playlistable is a good choice. The service generates playlists based on your preferences, mood or favorite artists, and it offers tools like Song Match and Artist Match that let you generate playlists based on a favorite song or artist, respectively, as well as some customization options. Playlistable is integrated with Spotify, letting you save playlists to your account.
Another tool worth a look is Moodset, an AI-powered mood tracker that generates playlists based on your current mood. It tracks your feelings with the circumplex model of affect and combines that with music preferences to generate a playlist for the emotional state you want to achieve. It can be useful for self-awareness and emotional control, and it syncs data across multiple devices so you can use it on whatever you're using.
Although Kits offers a range of AI audio tools for music creation, it's not specifically designed to generate playlists for Spotify. The service is geared more toward making music with tools like voice cloning, AI singing generators and audio mastering, but it doesn't have the playlist generation feature you might be looking for.