At the first glance, the first obvious difference is price. If Phyn plus is more expensive than the Flo by Moen, it doesn’t charge extra to inform you how you are using water. Apart from that, Flo technologies’ service is great than the Flo. If the Phyn app’s water usage goals help you reduce your usage and detect a possible leak. So. Phyn’s app is more elegant. But, Its algorithm is more sophisticated.