Spotiplus is described as 'With SpotiPlus, you can design nice looking cover arts for your Spotify playlists, tracks, albums, podcasts...in less than 1 minute'. There are more than 100 alternatives to Spotiplus for a variety of platforms, including Windows, Online / Web-based, Mac, iPhone and Android. The best alternative is GIMP, which is both free and Open Source. Other great apps like Spotiplus are Krita (Free, Open Source), Inkscape (Free, Open Source), Spotify (Freemium) and Adobe Photoshop (Paid).
Krita is a professional Free and open source (FOSS) painting program. It is made by artists that want to see affordable art tools for everyone withith concept art, texture and matte painters, illustrations and comics.
MyPaint is a fast painting program with an emphasis on full-screen use. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.
Pixlr® makes it easy to transform everyday images into stunning works of art. Whether you’re applying a quick fix to your photos or adding your personal touch with effects, overlays, or borders, Pixlr has everything you need to make your moments beautiful.