Because of this, the vast majority of font sizes stay the same between iPhone and iPad. That being said, the biggest difference is with titles. As you have a larger canvas to work with, an ideal body font size remains ideal — but you have much more space for larger titles. The default iOS font is San Francisco. You can download San Francisco for free. Apple would like you to be a doll and follow a few extra rules when using San Francisco. First, use SF Pro Display at font sizes 20 or higher.

Only use SF Pro Text for body text and smaller.

Designing for different screen sizes

Second, San Francisco is designed to have different character spacing at different sizes. Or just ignore the fact that Apple tells you to change character spacing down to the hundredth of a pixel. Live free or die, man. San Francisco is the default font for iPhone and iPad. However, you can, of course, design iOS apps in any font you want.

Be careful that others might appear bigger or smaller, or less legible, even at the same size. Thank you for your newsletter. See below for visual reference and more in-depth guidelines. But once you scroll, titles morph to 17pt, the default size for text-based actions as well. List Views Lists are the bread and butter of phone apps. Modals This little popup is a super illustrative example of how Apple styles text. The title is the default size.

Which you would think would not be enough, but what have we seen before? A thicker font weight to make up for it not being any bigger. The explanatory text is 13pt. So while some applications still use the iPhone-style 17pt titles… Others are bigger. Indentation and alignment can also indicate how groups of content are related.

If possible, support both portrait and landscape orientations. Be prepared for text-size changes. People expect most apps to respond when they choose a different text size in Settings. To accommodate some text-size changes, you might need to adjust the layout. For more information about text usage in your app, see Typography.

Provide ample touch targets for interactive elements. Try to maintain a minimum tappable area of 44pt x 44pt for all controls. Preview your app on multiple devices. You can use Simulator included with Xcode to preview your app and check for clipping and other layout issues. If your app supports landscape mode, make sure your layouts look great regardless of whether the device was rotated left or right. Upside-down portrait mode is not supported on full-screen iPhones.

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Some features, like wide color imagery, are best previewed on actual devices. Apply readability margins when displaying text on larger devices. These margins keep text lines short enough to ensure a comfortable reading experience. Maintain focus on the current content during context changes.

Content is your highest priority. Avoid gratuitous layout changes. Instead, it might simply adjust the dimensions of the grid. Try to maintain a comparable experience in all contexts. An app that runs only in landscape mode should be usable regardless of whether the user rotates the device left or right. It could, however, display menus and intro sequences based on the current orientation.

Make sure your app works on iPad, not just on iPhone. Users appreciate having the flexibility to run your app on either type of iOS device.

UI guidelines and why you should care

Even if you expect most people to use your app on iPhone, interface elements should remain visible and functional on iPad. If certain features of your app require iPhone-specific hardware—like 3D Touch—consider hiding or disabling those features on iPad and letting people use your app's other features. Be mindful of aspect ratio differences when reusing existing artwork. Different screen sizes may have different aspect ratios, causing artwork to appear cropped, letterboxed, or pillarboxed.

Make sure that important visual content remains in view on all display sizes. Extend visual elements to fill the screen. Make sure backgrounds extend to the edges of the display, and that vertically scrollable layouts, like tables and collections, continue all the way to the bottom. Avoid explicitly placing interactive controls at the very bottom of the screen and in corners. People use swipe gestures at the bottom edge of the display to access features like the Home screen and app switcher, and these gestures may cancel custom gestures you implement in this area.

The far corners of the screen can be difficult areas for people to reach comfortably.

A Comprehensive Guide To Mobile App Design

Inset essential content to prevent clipping. For best results, use standard, system-provided interface elements and Auto Layout to construct your interface and adhere to the layout guides and safe area defined by UIKit. When the device is in landscape orientation, it may be appropriate for some apps—like games—to place tappable controls in the lower portion of the screen extending below the safe area to allow more room for content.

Use matching insets when placing controls at the top and bottom of the screen, and leave ample space around the Home indicator so people don't accidentally target it when trying to interact with a control. Inset full-width buttons. A button that extends to the edges of the screen might not look like a button. Respect the standard UIKit margins on the sides of full-width buttons.

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A full-width button appearing at the bottom of the screen looks best when it has rounded corners and is aligned with the bottom of the safe area—which also ensures that it doesn't conflict with the Home indicator. Don't mask or call special attention to key display features. Don't attempt to hide a device's rounded corners, sensor housing, or indicator for accessing the Home screen by placing black bars at the top and bottom of the screen. Don't use visual adornments like brackets, bezels, shapes, or instructional text to call special attention to these areas, either. Be mindful of the status bar height.

The status bar is taller on full-screen iPhones than on older iPhones.