No, there is no app for the Monitor Bluetooth headphones.
All Marshall products are Vegan-friendly; only leather-like material is used.
Yes, these headphones can be used to make phone calls. Either wirelessly, or with the 3.5mm audio cable.
Yes, the Monitor Bluetooth headphones will connect wirelessly with a computer, smartphone or tablet that supports Bluetooth v4.0 and via cable to any device that has a 3.5mm audio output.