iOS default font sizes - also available on https://www.iosfontsizes.com

ios-font-sizes.swift

let styles: [UIFont.TextStyle] = [
    // iOS 11
    .largeTitle,
    // iOS 9
    .title1, .title2, .title3, .callout,
    // iOS 7
    .headline, .subheadline, .body, .footnote, .caption1, .caption2,
]

for style in styles {
    let font = UIFont.preferredFont(forTextStyle: style)
    print("\(style): \(font.fontName) @ \(font.pointSize)")
}

results.markdown

Style	Font	Size
.largeTitle	SFUI-Regular	34.0
.title1	SFUI-Regular	28.0
.title2	SFUI-Regular	22.0
.title3	SFUI-Regular	20.0
.headline	SFUI-Semibold	17.0
.callout	SFUI-Regular	16.0
.subheadline	SFUI-Regular	15.0
.body	SFUI-Regular	17.0
.footnote	SFUI-Regular	13.0
.caption1	SFUI-Regular	12.0
.caption2	SFUI-Regular	11.0

Thanks 👍
This is useful documentation :)

Thank you!
I am guessing these results are from running the code with the default user font preferences?

@NikolaKirev Correct, this is just at the default dynamic type size. You can see a graph of what happens to the type sizes in this graph.

what are the font sizes for iPad?

I think when considering accessibilities this won't be the correct size anymore.

Useful... Thanks

Usefu! Thanks!

is WatchOS different? On WatchOS .footnote seems to be smaller than .caption and .caption2 🤔 https://developer.apple.com/design/human-interface-guidelines/watchos/visual/typography/

Thank you for posting this.

Thank you @gesabo for the link. Here is those values for iOS https://developer.apple.com/design/human-interface-guidelines/ios/visual-design/typography#dynamic-type-sizes

This is very useful!

In case anyone else finds a side by side comparison with macOS useful:

Style	iOS	macOS
.largeTitle	Regular 34.0	Regular 26.0
.title1	Regular 28.0	Regular 22.0
.title2	Regular 22.0	Regular 17.0
.title3	Regular 20.0	Regular 15.0
.callout	Regular 16.0	Regular 12.0
.headline	SemiBold 17.0	Bold 13.0
.subheadline	Regular 15.0	Regular 11.0
.body	Regular 17.0	Regular 13.0
.footnote	Regular 13.0	Regular 10.0
.caption1	Regular 12.0	Regular 10.0
.caption2	Regular 11.0	Medium 10.0