I’m sure there will always be interest in the option of additional 3rd party interfaces, and I am sure you will get some willing to pay, but I doubt you are going to get a whole lot to actually purchase it. If you were going to make it free, definitely, but it just feels kind of selfish to come into an open source community like Home Assistant, having all of the developers spend all of their time and expertise on this project and not charge for it, and then have someone come along and build a frontend using their API just to try and make money off of what others are doing for free.
Look at HADashboard, a port of dashing for Home Assistant… @aimc works his butt off on these projects, including AppDaemon, which is a huge undertaking, and it is available for free!
Now there is an iOS project being developed as a native app for Home Assistant by @robbiet480, but there is no plan for him to make an Android version, so if you want to make an android app, there is already those asking for it in the iOS thread, so there is already people looking forward to the idea of an Android app. Whether you charge for it or not is up to you, and if @robbiet480 charges for his, I won’t purchase it either, especially since it is being called the “official ios app” for home assistant, but personally, I’ll stick with the default web interface and continue to support the open source nature of Home Assistant.
It is rather ironic to make a paid app for “OpenHAB”… the name itself shouts OPEN SOURCE, yet your project is closed source lol and yes, I know the word OPEN in OpenHab does not mean open source, but it was just kind of funny lol
Your application does look very, very nice though… good work!