It's only required to pair the phone and sync the time, but after that you can use any app. If you do not have the app, you won't be able to pair the device, but after you pair the device you can delete the app.
I would consider it able to charge almost any device with a micro USB my wife used it to charge her phone and her Kindle. It does steam through the Bluetooth well. I haven't had a problem. It is a great device.