Labels use static text to convey short messages and are one of the most common elements in your app. They can span multiple lines and can be updated programmatically.
Design for legibility. Use lighter colors for label text and use Dynamic Type to ensure that text is sized appropriately. The built-in text styles offer the best legibility and automatically support Dynamic Type. If custom typefaces are necessary, avoid using ones that are overly stylized. See Typography.
For developer guidance, see WKInterfaceLabel.