I've loved using this app until about 2 weeks ago, would have rated it 5 stars. Then while using my Spotify app, it would go silent for the ads, but then not play the next song. So I think Spotifree might be a broken (perhaps orphaned?) app now. I'm using the latest macOS 10.12.5 and the latest version of Spotify. I wasn't able to find any newer version of Spotifree than from 2015.