How to add Unspend to your phone home screen
Unspend is not a proper app yet but you still can add this webapp to homescreen and use it as a regular app.
On iPhone, tap the Share menu button 
in Safari, select Add to Home Screen 
and tap Add.
On Android in Chrome, tap the three vertical dots button 
at the top right corner, select Add to Home
screen 
, tap Add
and
tap Add.
On Android in the Samsung browser, tap the hamburger icon ≡, tap Add page to button +, select Home Screen and tap Add.