GrapheneOS looks interesting but DivestOS's focus seem to be aftermarket devices that Graphene is not targeting.
I recently got an unofficial build of LineageOS running on a Nexus 4 (mako) device and I was positively surprised with the speed it can run modern software. But this is an unofficial build that is also broken on some essential points, such as WiFi.
For these old devices, Graphene is not an option and if there are others targeting the same devices as DivestOS (which I will surely be checking out soon) I have yet to see them.
I recently got an unofficial build of LineageOS running on a Nexus 4 (mako) device and I was positively surprised with the speed it can run modern software. But this is an unofficial build that is also broken on some essential points, such as WiFi.
For these old devices, Graphene is not an option and if there are others targeting the same devices as DivestOS (which I will surely be checking out soon) I have yet to see them.