The HP smart app is a free tool from Hewlett-Packard designed to assist you in printing operations or notifying the errors in your HP printer. To download it, you can visit the website 123.hp.com/setup from your computer or smartphone, and on the homepage, click download now under HP smart app. After installing it, you can add your HP printer by clicking ➕ sign (add your printer). The HP smart app can also help you connect your printer to the wireless network, fix some common printer issues and errors in your printer. The app is available for Windows, Mac, Android, or iOS device. If you face any trouble navigating the website, then contact our customer support.