Riffstation was initially a desktop application for Mac and Windows computers.
It allowed the user to load an audio file or CD track, and it would
automatically detect the chords and sync the chord diagrams with the music.
You could also slow down the audio, change the pitch, isolate or mute guitar
parts, loop specific sections and sync a metronome.
It was a paid app (with a free trial).

Some time later, a free web version was released, for YouTube videos, with
less features than the desktop version (it was mostly a chord viewer).
There was also an iOS version.

In May 2018, the iOS and web versions were discontinued, and the desktop
version was made free.

In early 2019, the desktop version was also discontinued.