Spotify has announced on its developer blog lately that they will abandon the old app framework in the desktop software completely. This means that popular and well-known apps like musiXmatch, TuneWiki or Last.fm for Spotify will no longer be available in the App Finder. Here is an excerpt from the announcement:
"Spotify Apps (Discontinued)
This feature is no longer available.
Please note: Future releases of the Spotify Desktop client will no longer feature an App Finder tab and will no longer support the presentation of Spotify Apps, therefore this feature has been discontinued.
As Spotify evolves and priorities change, we sometimes have to remove APIs from active development and shift focus to the relevant platforms. With the new APIs and SDKs now available we are phasing out Spotify Apps support from the desktop client. In the upcoming version you will no longer be able to run third-party applications within the desktop client. This means the App Finder and apps inside the desktop client will no longer be available and we are terminating our Application Distribution Agreement.
The update will gradually roll out from today, starting with a smaller percentage of new and existing users, with the majority of our existing users receiving the update early in 2015."
No longer supporting these apps means that e.g. personalised recommendations for new music are even harder to find in Spotify, as they are also testing what to do with the Discover tab which might get replaced with a general Top Hits Highlights section or even be abandoned completely.
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