When it comes to minimalist design and dark mode, these are two very current topics in today’s design, development, and implementation of web and mobile applications. Often heard is the phrase „Less is more,“ which will be explained in detail through this paper, both from a theoretical perspective and with practical examples. Minimalist design has numerous advantages from various perspectives, but it also presents a significant challenge for designers because it requires highlighting everything important in the right way without excessive decoration and too many details. On the other hand, dark mode also presents a challenge, but from a technical standpoint, it has many advantages, as well as from the perspective of user experience. In comparison to lighter themes, it facilitates viewing the screen during the night and contributes to energy savings. In summary, today, minimalism and dark mode, in combination, when creating design software, improve the user interface (UI) and user experience, and enhance application performance in various fields.