When Apple releases new versions of iOS they often add new default fonts, and iOS 7 is no different - although maybe especially notable for its thin variants of Helvetica Neue, which is one of almost 40 new font styles added in iOS 7. The following list was generated by listing the fonts on an iOS 6 device with a couple of handy methods on UIFont, doing the same on iOS 7, finding the differences with a simple Python script and then creating a simple table view which I screen shotted. I’ve also got the full lists on my GitHub account.

The new fonts

AlNile

AlNile-Bold

AppleSDGothicNeo-Light

AppleSDGothicNeo-Regular

AppleSDGothicNeo-SemiBold

AppleSDGothicNeo-Thin

ArialHebrew-Light

Damascus

DamascusBold

DamascusMedium

DamascusSemiBold

DINAlternate-Bold

DINCondensed-Bold

DiwanMishafi

Farah

GeezaPro-Light

HelveticaNeue-MediumItalic

HelveticaNeue-Thin

HelveticaNeue-Thin_Italic

IowanOldStyle-Bold

IowanOldStyle-BoldItalic

IowanOldStyle-Italic

IowanOldStyle-Roman

Menlo-Bold

Menlo-BoldItalic

Menlo-Italic

Menlo-Regular

SavoyeLetPlain

Superclarendon-Black

Superclarendon-BlackItalic

Superclarendon-Bold

Superclarendon-BoldItalic

Superclarendon-Italic

Superclarendon-Light

Superclarendon-LightItalic

Superclarendon-Regular

Thonburi-Light

Image of all the new fonts