How to get HydrogenOS icons on any OxygenOS device
OnePlus maintains two different versions of their devices’ software: OxygenOS and HydrogenOS. The former is pre-installed on their devices sold internationally whereas the latter is pre-installed on their devices sold in China. OxygenOS and HydrogenOS have a lot of differences (a lot more than some may think) despite both software builds being developed by OnePlus. Even something minor like the icons have slightly different designs. Thanks to XDA Recognised Themer shehabskull, however, you can install the HydrogenOS icons on your device running OxygenOS!
As shown in the comparison above, Folio is the stock OxygenOS icon pack whereas the Hydrogen icon pack is clearly from HydrogenOS. According to shehabskull, this icon pack will work on any OnePlus device, including the OnePlus 3, OnePlus 3T, OnePlus 5, OnePlus 5T, and OnePlus 6. The only caveat is that you can only use these in the stock OnePlus Launcher as the developer says they will not work on third-party launchers. All you need is the stock launcher and you’re good to go.
If you want to give it a try, check out the link below and install it. You don’t even need root access to install the new icon pack!