Most use cases of consistency in the Web app are achieved by a react application using components as well as state management in order to create an interface.

Component-based architecture: React highlights that the user interface has to be broken into reusable self-contained components. A structure, behavior, and a style for a particular thing is ensured through it to give an aspect, i.e., how things in general, such as modals, buttons, and forms look and behave consistently around an application. A reusable part once created is simply reutilized around your application and thereby makes reduction in inconsistency, thus being easy to implement the global update.

State management: the structure component-based allows for managing control centrally as well as data management with the aid of state. If a central control is realized through usage of the React hook - useState or via larger applications, like Redux or Context API, all the states of the components that depend on the same data, would remain synchronized. Such prevents the phenomenon where the certain components will display data that could already be old or not accurate at all, which, in fact, preserves a consistency in the user's experience.

Props system: With the help of props, the components receive information from their parent components. This system makes sure that the components could be dynamically configured to follow a standardized design and behavior based on the data they receive. Thus, even though the content in it is different, the app will be visually as well as functionally homogeneous.

Global styling solutions: With the aid of global styling solutions like CSS modules, styled-components, and Tailwind CSS, one is allowed to enforce just one single source of truth for all their styles: colors, fonts, or layouts. All these will ensure their use remains consistently uniform even with different screen sizes or varying components involved in developing an application for web services.