Figure below shows what the app can do. The left half is a photo taken at night and the right half is the same photo after processed by Brighter Photo app.
To use the app, the GUI has three buttons: Load, Save and Setting. "Load" button can load photo from Android gallery. After loading, post processing immediately starts. Post processing takes 10-30 seconds depending on the image size. It runs slower than some of the similar apps but produces better results. "Save" button allows to save the results. Note that to enable saving, the storage permission needs to be enabled in Android setting for this app.
This Youtube video shares how to use the app.
Hope that this introduction is useful and you can enjoy using this app. Any feedback is welcomed.