Certain older cameras like the Canon EOS 1Ds mark II does still deliver good quality but the LCD screen on the back of the camera is really bad compared to more recent ones. It's also so small that I almost can't use it. I use an Eye-Fi card and a tablet to evaluate the images when I can't shoot tethered, but I miss the information the histogram provides. The official Eye-Fi app doesn't seem to have that feature unfortunately.
There seem to be an app called ShutterSnitch for iOS that can display histograms. However the app is not available for android. Is there an android app (that imports the images automatically on capture) that displays a histogram of the current picture?