The first commit on Redshift is November 2009, and I don't think it was the original implementation of this idea.

https://github.com/jonls/redshift/commit/4818f331cedeba94bb7...

Oh, f.lux was released in February 2009 for desktops, I was just talking about the iOS app.

That's correct. Way back in the 90's I was tweaking the VGA color palette registers of my MSDOS computer to make the colors more easy on my eyes at night. I never released that small program...