A new web app or mobile app will require an interface that is engaging and interactive. There are many steps that are required to design an interface that adds to the experience of the user. A good design uses various elements including color and layout. The interaction of the user with your website or app often is dependent on the way the user interface is designed.

One important aspect of any user interface is consistency. This means that navigation and transitions to other pages and elements needs to be the same. Most users have expectations of how to use apps found online or used with a mobile device. Mobile app development from mobstac for example are highly polished and tested before being released. This will bring greater quality control and overall better design. Users need to be presented with the same design throughout. Your color scheme is an example of an element that needs to be consistent.
No interface is perfect and users seem to find ways to make mistakes. Users that make mistakes want a way to go back to a previous screen or undo any changes that were made. Interfaces that do not include any type of error correction will not be widely accepted by users. A menu or message on the screen is a way to engage users that have made a mistake.
New information that appears on the screen of the interface needs to be highlighted. If you have a feed for your app that is constantly updated, then highlighting new content is important. Colors offer a way to highlight new content or an icon can appear on the screen.
Cutting and pasting can be done using a mouse and by keyboard shortcuts. Apps will need to include a set of keyboard shortcuts to engage the small number of users who use this feature. You need to have a shortcut to copy, paste, and to undo and action.
Designing an interface that is unique and engaging does not mean abandoning standards and the use of conventions that are familiar to users. Common standards are a clipboard icon to paste and an icon of a folder to open a file. You should also refrain from using different naming conventions for menus. Look at other apps to get an idea of the icons that are being used.
The addition of customization options is a great way to provide an interactive experience for users of an app. One type of customization option is to upload an avatar. Another may be the ability to change to a different background or theme.