It happens all the time. You hear a song on the radio that you like, but you didn’t get the name of the song, and it gets worse if the song gets stuck in your head and you find yourself humming it all day, even though you don’t know what it is. Shazam is one of several apps that automatically recognizes music and the free version of the Shazam app no longer has limits on how many songs it recognizes per month.
Shazam calls song recognition tagging, and in 2009 Shazam switched to a freemium model in which the free version limited users to five free tags per month while the paid for premium version provided unlimited tagging. Earlier this year Shazam started an experiment by providing unlimited tagging in their free Android app, although the free version displayed an ad for eBay. The free version of Shazam for iOS retained the 5 tag limit.
Apparently, Shazam has learned from their experiment that they can get enough revenue from advertising so they removed the tagging limits. The premium version of the app, which costs $4.99, is still available, does not display ads, and includes a synchronization feature not available in the free version of the app.