Our everyday life is an endless flow of choices. In both personal and professional life, we have to consider numerous oppositions and challenges, and it’s better when solutions are based on not only suggestions but also facts, experience and knowledge. Today we are going to discuss one of the frequent choices UI designers have to make project by project: which scheme is better for the interface, light or dark?
Factors influencing the choice of color scheme
Be sure, there is no one particular choice which would work for all the aims. The solution heavily depends on numerous factors covering not only user’s side but also business goals, market conditions, and current design trends. Let’s review the essential factors which have to be considered regarding the issue.
Readability and legibility
These terms are both directly connected to the perception of content presented with text. Readability defines how easily people can read words, phrases, and blocks of copy. Legibility measures how quickly and intuitively users can distinguish the letters in a particular typeface.
These characteristics should be carefully considered, especially for the interfaces filled with a lot of text. Among many other factors, the color scheme chosen for the interface plays the crucial role in the effective process of text perception. For example, as well as with physical objects perceived on different backgrounds, black copy shown on white or light background seems to be larger than the white copy on a dark background. Poor readability results in poor user experience: users aren’t able to scan the data, even more — even if the data is relevant but not readable, users feel the inexplicable tense struggling with the text or may even miss the critical information.
Does it mean that interfaces with light background are more readable? Not always. One of the famous gurus of user experience design Jacob Nielsen mentioned: «Use colors with high contrast between the text and the background. Optimal legibility requires black text on white background (so-called positive text). White text on a black background (negative text) is almost as good. Although the contrast ratio is the same as for positive text, the inverted color scheme throws people off a little and slows their reading slightly. Legibility suffers much more in color schemes that make the text any lighter than pure black, especially if the background is made any darker than pure white.» So, any color scheme may be readable enough if the designer studies the peculiarities of copy perception on different backgrounds and works carefully on the font choice.
However, some scientific studies dating back to 1980s show that for big bulks of text light background appears to be a more effective choice for the majority of users. Studying how advertising carriers worked, D. Bauer and C.R.Cavonius shared their explorations in the paper «Improving the legibility of visual display units through contrast reversal» (1980). In particular, they found that participants were 26% more accurate in reading text when it was featured with dark characters on a light background.
Why may that be so? Jason Harrison from Sensory Perception and Interaction Research Group (University of British Columbia) explains this phenomenon the following way. People with astigmatism (which according to various stats present about 50% of the population) feel it harder to perceive white text on black than black text on white. Part of this has to do with light levels. With a bright display (white background) the iris closes a bit more, decreasing the effect of the «deformed» lens. With a dark display (black background) the iris opens to receive more light and the deformation of the lens creates a much fuzzier focus at the eye. So, based on this, if the interface presents a lot of copy and suggests long-reading experience, a light background may feel more user-friendly.
Accessibility is mostly defined as the ability of the web or mobile interface to reach as many people as possible and provide its functionality regardless any discriminations. So, the decision “to use or not to use” has to be mostly grounded in users’ needs and preferences, not on their physical abilities. Color scheme is mentioned among the top factors affecting this aspect. Selecting the palette and color combinations, a designer needs to take into account the users of different age, special needs, or disabilities which can also determine the choice of color for the background and layout elements. User research becomes the great help providing UX designers with the data that helps to get closer to the target audience.
Clarity defines the ability to see and distinguish all the core details on the screen or page. First of all, it deals with simplicity and intuitiveness of navigation: being able to scan the layout and find zones of information and elements of interaction, users don’t need to put much effort in getting what they need. If this aspect is not tested properly, it may lead to weak visual hierarchy and turn the screen into a complete mess. Contrast plays the big role here and color scheme becomes the foundation for it. To check, if the interface is clear and contrast enough, don’t forget about a good old trick of “blur effect” when you look at the screen or page in the blurred mode and check if everything vital is easily reached and noticeable.
Responsiveness of the interface means that users get it usable and functional whatever it the device they use it on. What looks stylish and appealing in Sketch n high-res professional monitor may transform into a dirty stain on the small low-res screen. Therefore, some color schemes looking nice at the design stage may lose their beauty in a variety of everyday conditions they are applied in. As color scheme directly influences color, shape and copy perceptions, it should be tested on diverse devices before making the final decision.
Web and mobile interfaces are used in environments which may be pre-supposed as typical if the target audience is researched carefully. For instance, concerning constant use under natural light, a dark background can literally create the effect of reflection, especially on glossy screens typical for tablets and smartphones. On the contrary, in conditions of badly-lit environment, a dark background can take the light away from the screen which has a bad influence on navigation and readability. So, the issue of color combinations, contrast and shades draw big attention here.
Checklist for color scheme selection
With the factors mentioned above, we offer here a short checklist of basic steps to follow while selecting a general color scheme for web or mobile interface.
1. Define the purpose of the interface. Having determined the core points of the interface utility and problem-solving capacity, you make the choice of the color scheme more reasoned. If the UI is text-driven (a blog, news platform, e-reader etc.), light background tends to be an effective choice. Light makes the screen airy and spacious and it will be easier to concentrate purely on the copy. On the other hand, if the interface is visually driven and moves round images rather than text, color scheme with a dark or bright background may be a good solution as the colors of the images feel deeper and the general layout gets stylish or even luxury look.
2. Analyze your target audience. Definition and analysis of the target audience are the primary thing designer should do. Knowing who is your potential user and what they will want to get from the website or app sets the solid basis for a usable, useful and attractive interface. Middle-aged and older people tend to prefer interfaces with the light color scheme as they find them more intuitive and navigable. Younger people often find well-performed interfaces with a dark background more original and stylish so that can be the way to involve target users. Teenagers and children are attracted to interfaces using bright backgrounds and funny details. The choice of color obviously depends on the nature of the interface functionality and content. But preferences of the target audience are always a good clue to user-centered decisions.
3. Research the competition. Another aspect to keep in mind is that your product isn’t going to appear one in a blue ocean. Vice versa, it will fight for user’s attention in conditions of great and dynamic competition. The choice of the color scheme also becomes the way to make an app or website outstand and lead to such a precious first wish of interaction from user’s side. Time spent on exploration of the existing products in the segment saves time and effort otherwise wasted on the redesign of ineffective solutions.
4. Test, test, test. The points described above are convincing about a key thing to do: as the color belongs to the factors directly affecting usability and attractiveness of the interface, every design solution should be appropriately tested, in different resolutions, on various screens, and under diverse conditions. Testing reveals strong and weak sides of the color scheme before the product comes on the market, gets discussed and loses the chance of stunning first impression if the design solution is inefficient.
Not wishing to stick to the strict color schemes, user interface designers sometimes find compromise solutions, like the following ones.
Dark interface, white tabs for copy
As we mentioned in the review of UX design trends, this trend got especially popular for interfaces based on the dark background scheme. It features one more approach to proper readability which is often the issue of debates: applying boxes or spaces with the light background for core data blocks, designers solve this problem and add elegant contrast to the screen or page. One of the cases, when it was applied efficiently, is Watering Tracker app designed by Tubik team.
Giving the choice of color scheme to the user
Another approach is giving users a choice of modes. That is what we did for Upper, a to-do list app that offers the user a selection of color scheme. On the one hand, it makes the product really friendly to users and makes a choice more personalized according to not only usability issues but also aesthetic preferences. On the other hand, it takes additional work hours for designers and developers to work out all the schemes.