With BlueTunes you can listen to your music and use other iPhones and iPads as loudspeakers over Bluetooth and WiFi.
The procedure is simple: On one iPhone or iPad you choose "Serve Music" and listen to your music as you would do with the iPod app. On all other iPhones and iPads, where BlueTunes is running, you see serving iOS devices in a list. By tapping on one of them you are immediately using the current device as loudspeaker.
Ratings and Reviews
It's good but needs improvements
I like I can use this app as an extra speaker but needs improvements. The app doesn't increase the play count on the songs I listened to and needs a little more stability. Over all, it's a good app.
Works great after in app purchase. It works better via wifi. If you use it with bluetooth, the audio gets choppier the further the devices are from each other.
Overall it's a great app but it does need to be updated for the new IOS. It also puts your purchased music on it and crashes when you try to play them.
With Family Sharing set up, up to six family members can use this app.