Android
The app itself, as a file. APK
Download APKAndroid asks once whether to allow the install. Say yes and it is on your home screen.
Get BookHere
Your studio as a real app on the machine you actually work on.
iPhone, iPad and Mac
On the home screen, straight from Safari.
Open the studioThen press Share, and Add to Home Screen. It opens full screen with its own icon, the same as any other app. Apple does not allow a one press install from a web page.
Windows
Installs to your taskbar, its own window, no browser bar.
Linux
Installs into your applications, its own window, no browser bar.
On a Mac or an iPhone? Open the studio in your browser