Should UI buttons use sentence case?

In most modern product interfaces, sentence case improves readability and consistency for buttons and labels.

Is Title Case wrong for user interfaces?

Not always, but sentence case is often preferred for app UX copy while title case is more common in marketing headlines.

Use it in navigation labels, button text, settings, form labels, helper text, and notifications for a natural reading flow.

Sentence case improves readability and feels more natural in modern interfaces.

Marketing pages and article headlines can still use Title Case. UI copy and workflow labels usually perform better in sentence case.