(Two links inside)

If you want to rebuild a screen from a previous design or create a copy from another layout. With this app You can overlay a picture/screenshot and/or a grid .There is also an option to set the alpha value. The picture is always visible.

https://play.google.com/store/apps/details?id=com.ms_square.android.design.overlay

The next one is custom grid overlay. You can set single or repeating lines vertical and horizontal with differend colors.

If you have many screens in your launcher and want to have a continous look, this tool is very good.

https://play.google.com/store/apps/details?id=com.actinarium.materialcue

Have fun 🙂