Apps like Greyscale

Here are some great alternatives to Greyscale by 与非 :
SystemUI Tuner
SystemUI Tuner
★3.6
Comatose — Android Deep Sleep
Comatose — Android Deep Sleep
★4.5
SecondScreen
SecondScreen
★4.2
Gray-Switch (Grayscale)
Gray-Switch (Grayscale)
★3.8
Automatic Dark Theme for Andro
Automatic Dark Theme for Andro
★4.3
Redmi Note 2 Tool
Redmi Note 2 Tool
★4.9
Wear brightness control
Wear brightness control
★3.8
Ultra White Screen
Ultra White Screen
★4.8
Droid48
Droid48
★4.8
Amoled
Amoled
★4.6
NotifyEdge - Edge Lighting
NotifyEdge - Edge Lighting
★4.1
NotifyBuddy - Notification LED
NotifyBuddy - Notification LED
★3.8
[ROOT] OnePlus Dark Mode Toggl
[ROOT] OnePlus Dark Mode Toggl
★4.1
Blackr: OLED Screen Off
Blackr: OLED Screen Off
★4.4
Galaxy Max Hz Donation
Galaxy Max Hz Donation
★3.8
Basic Black Theme for Smart La
Basic Black Theme for Smart La
★4.3