What development effort will it take? Barely any, if any.
Quite a lot. It's not quite as simple as it looks, plus there are much more important issues to sort out before considering a screen tint.
and a reason why I don't let my son use the iPad up to an hour before bedtime.
He shouldn't be using the iPad up to an hour before bedtime anyway not just because of the screen tint issue. He needs time to wind down before bed and if his mind is active for that long he's going to have problems sleeping anyway.
I do wonder how much of this issue is related to the tint of the screen and how much is simply down to not giving yourself time to wind down before bed.
And what if it is something at least close to that to someone?
It isn't! Simple as that. If you have an issue that has been professionally diagnosed you are likely to need a bigger aid than a colour temperature tint on your iPad.
Look - let me finish by summarising my points.
Yes - f.lux is a good application. I didn't notice any benefits to sleep myself however the tint was easier on the eyes.
No - I don't think that the inability to sleep because your iPad's colour temperature is showing too much blue is either a disability or necessitates the need for Apple to implement f.lux.
No - I also don't think it's a good use of resources.
Why?
- Those who rely on f.lux will hold off on upgrading their OS and losing their jailbreak if they consider f.lux to be a necessity.
- Those who have never jailbroken their iOS device have no idea of the use or benefit of f.lux having never used it before.
- iOS7 still needs a lot of work to iron out inconsistencies and bugs, I think the engineering need to be concentrating on those first rather than implementing a feature that the vast majority of iOS users won't use.
Should they allow it into the App Store? Yes, absolutely. This is the logical place to do it. If opening up the API requires a vast amount of in depth iOS rewriting, then no.
Let me open this up a little more then...
Are you guys campaigning your TV manufacturer to integrate f.lux into your TV set? Surely if it's a "medical necessity" then ALL devices with LCD screens need it integrated, no?