The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Haritz Garcia Oliden:
Get music from what you see with one single touch. Point at a recognizable image, take a picture, and immediately get results from our providers: + iTunes+ SpotifyCalliope is an image reverse search engine that shows instant results from the selected provider by tapping the screen one single time. This app marks a milestone in phone/tablet usability: no more typing in a tiny keyboard! Use visual search to directly jump to what you are waiting for. Simple and handy you will adopt this app in your daily routine and soon will forget you are using it.