Cyanogen OS

[belodion]

The three versions of the Spark run Cyanogen OS, a highly customisable and popular ROM that within reason can be as like or as different from Android OS as you choose.
The Top 10 things about Cyanogen OS you need to know | Android Central

Posted via the Android Central App

 

[Golfdriver97]

I would love to try a device that has Cyanogen OS versus CyanogenMod just to see what differences there may be.

 

[Jimbode]

The main difference is root is built into Mod but not OS. Can be turned on and off in developer options on CyanogenMod