A friend with a not-so-modern Android 5 phone needs to take good pictures of her rooms with large windows.
Problem: Pictures she took with the stock camera app have the inside of the room very dark, and the windows showing outside very bright.
As the stock camera does not do HDR, she needs an HDR app. I have tried the highest-voted HDR apps, they only do post-processing on a single frame. What user-friendly free app does real HDR?