I noticed this with Evernote.

I am still on my iPhone4 with iOS6 and now, everytime I try and sync my phone with iTunes I get the pop up notice that Evernote will not be synced as it requires a new OS version.

I have 100 apps on my phone and that one is the only one that does this. Why on earth did the developers require iOS7 as minimum? What is wrong with supporting iOS6 seeing as iOS7 is still in its "1.0" and not even 4 weeks old?

I get that they wanted to include iOS7 as early as possible. Hell, every app basically did. But Evernote is the only one of my apps that now apparently refuses to work with anything <iOS7.

I guess I was lucky that I still had it on my phone cause otherwise, I would be left without the ability to install it now.