The user interface of Nibbels was designed by Guaranteed Design, a leading company in the field of app development and design. Guaranteed Design has over 10 years of experience in creating intuitive, attractive, and user-friendly interfaces for various platforms and industries. They have worked with clients such as Spotify, Netflix, Uber, and Airbnb, and have won several awards for their innovative and creative solutions. Guaranteed Design used the latest technologies and best practices to create a seamless and enjoyable experience for Nibbels users. They incorporated elements such as animations, icons, colors, fonts, and layouts to enhance the visual appeal and functionality of the app. They also conducted user testing and feedback sessions to ensure that the app meets the needs and expectations of the target audience.