Simplify Alternatives
Simplify is described as 'is the simplest way to control your music' and is a Audio Player in the audio & music category. There are seven alternatives to Simplify for Mac and Spotify. The best alternative is Bowtie, which is free. Other great apps like Simplify are NepTunes, SpotMenu, BarTunes and Menu Bar Ticker.
Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify, Sonora, or Rdio) with customizable shortcuts, advanced Last.fm support, and hundreds of beautiful themes available to download for free.
Discontinued
The official website is no longer available. Last version, 1.5, released in March 2012, can be still downloaded from Wayback Machine.
SpotMenu is a combination of TrayPlay and Statusfy written almost entirely in swift.
No screenshots yetBarTunes allows you to control iTunes from your Mac's menu bar.
Menu Bar Ticker is a simple macOS menu bar item that displays the current artist and song playing in Music (aka iTunes) or Spotify.
This is a popup that shows Spotify current playback information, made and tested specially for macOS. It also allows you to add tracks to your library and playlists.
No screenshots yetPlay/Pause and Next/Previous functions for Spotify directly on your Menu Bar!.