Free installation as Progressive Web App
Installation on iOS
Open the web app in the Safari browser and simply tap on the small upload icon, which is located in your open browser tab. Now select the "Add to Home Screen" option. The app will be installed and an icon will be added to your Home screen.
Installation on Android
Open Chrome on an Android device. Go to a website whose Progressive Web App you want to install. Tap "Add to Home Screen" and follow the on-screen installation instructions.