If that's the same one I tried, it doesn't actually work the same. It works by overlaying a transparent reddish color over everything, effectively "redshifting" whites but also (and unlike flux/redshift) messing up black (black goes from black to red-tinged black).
This was very noticeable for me because I have an AMOLED screen, so going from black to red-tinged-black actually made my phone brighter.
Hmm, you're right about the blacks, but it does the trick for me. Definitely doesn't seem brighter to me, the blue-white brightness is far more wakeful.
This was very noticeable for me because I have an AMOLED screen, so going from black to red-tinged-black actually made my phone brighter.