This is not a stand alone app. Theme requires Kustom Live Wallpaper Maker PRO application (not free version of this app).

Betwix theme for KLWP supports all screen ratios.
This theme has 3 gradient wallpapers and you can select them from the main screen.

What you need:
✔ Kustom (KLWP) PRO
✔ Compatible launcher that supported by KLWP (Nova launcher is recommended)

How to install:

✔ Download Betwix theme for KLWP and KLWP PRO application
✔ Open your KLWP app choose menu icon on top left then load preset
✔ Find and tap on the Betwix theme
✔ Hit "SAVE" button on the top right

Instructions:

In the Nova launcher settings you need:
✔ select 1 screen
✔ hide status bar and dock

In the KLWP settings you need:
✔ select 1 screen

Please contact me with any questions/issues before leaving a negative rating about Betwix theme for KLWP.