The HP Smart app is a software platform that allows you to manage all of your HP printers from one location. This app will assist you in quickly and easily set up your HP printer. Because it will automatically detect Wireless HP Printers on your Home or Office Network. On a Windows 10 machine, however, this HP App may occasionally display a Printer Offline error. It's because your Router and HP Printer have a bad or loose connection. On Windows 10 PCs, the HP Smart Printer Offline Problem is quite frequent.