Use APKPure App
Get HTML Color Tester old version APK for Android
This app can check HTML color code with the seek bar corresponding to RGB.
With the seek bar (Red, Green, Blue) that supports HTML color code, you can freely change the background color of this application. You can also use the PRESET COLORS button to change to a preset background color with one touch.
Please use it not only for checking the HTML color code but also for checking the color scheme of apps and web pages.