Mixcard had a good run and brought love into the world in strange ways. The founders are now pursuing other projects and are no longer able to maintain the app.
When Mixcard was alive, it let you create a mixtape playlists on the site, pick an art print, and then it would print and mail a postcard with your music attached to it as a QR code. Friendships and romances insued. Long distance relationships saved. Dance parties were delivered with your snail mail.
Please don't let this stop you from sending a special postcard to someone the old fashioned way.
Chris and Alfred