Smartphone manufacturers have been pushing boundaries in the attempt to minimize bezels and increase the screen area as much as possible. In this crusade against bezels, companies have opted for wide or mini U or V-shaped bezels, or even hole-punch cutouts while also purging the notification LED. Notches aren't preferred by everyone but if you wish to utilize the notch area constructively, Energy Notch is an application that lets you add a colorful and animated battery indicator around the notch of your phone. Energy Notch is created by the developer of Energy Ring which serves similar purpose for hole-punch cutouts and is now available for the OnePlus 6T.
Energy Notch simply works by displaying a colored area in an overlay. The creator of the app, XDA Recognized Developer jagan2, notes in the Forum thread that the app has a negligible impact on the CPU and does not consume much battery on the OnePlus 6T. This is done by ensuring the app only wakes when the battery percentage is updated.
Energy Notch thread on XDA Forums
Besides adding single or multiple colors to the notch, you can also use a gradient and these configure these colors to change with the battery percentage. You can also add an animation that is displayed when the phone is charging and configure the flow of the animation between left-to-right or right-to-left. You can also modify the width of the notch as per your preference.
Energy Notch resembles Notch Pie and Battery Notch Indicator that serve the similar purpose of sprucing the notch area. However, unlike theses apps, Energy Notch is exclusive to the OnePlus 6T at the moment and will not work on any other device. This hopefully indicates that the app is well optimized for the OnPlus 6T and you can just install it and roll without having to adjust the width and the shape of the notch – something that is usually required for other apps.