Flat design is a visual style that removes decorative depth, realistic textures, and ornamental effects in favor of simple shapes, clear typography, and direct hierarchy. Its roots run through Modernism, Mondrian, Swiss Style, early graphical interfaces, Microsoft Metro, and the sweeping redesigns that followed Windows 8 and iOS 7.
I first wrote about that history while using a Windows 8 laptop. Like many others, I hated it and thought it was the worst operating system since the not-so-distant Vista. With distance, though, it is easier to appreciate that Microsoft made a bold design decision that became influential even when the product around it was frustrating.
Microsoft’s Metro design language had appeared earlier in one of the least likely places: a much-mocked music player that almost nobody bought apart from one kid at my school, the short-lived Zune. Its large typography, clean spacing, and tile-based navigation offered an early glimpse of the interface language Microsoft would push into Windows.
Windows 8 arrived six years after the Zune and used the same design language, but because it was seen by rather more than five people, it had a much larger sphere of influence.
Apple was moving in the same direction. iOS 7 left behind much of the leather, beveling, gloss, and decorative shadow that had made software imitate physical objects. Within a few months, the two largest platform makers had popularized what became widely known as flat design.
Although I’m not sure how much attention Apple pays to Microsoft’s products, the change looked as if someone had grabbed Apple by the shoulders and shaken the clunky skeuomorphic excesses away. In iOS 7 there was not a leather-bound book, bevelled button, or heavy drop-shadow in sight.
The result looked new, but its underlying ideas were not. To understand why flat design felt inevitable, it helps to follow the thread through a century of visual culture.
Modernism: pure functionality
Modernist architecture is one reason I have lived in a brutalist, Soviet-era block of plain concrete apartments, built to house many people efficiently in limited space. The style developed through the early twentieth century around practical, stripped-back design and a suspicion of decoration for its own sake.
Modernist design aimed for function rather than display. That does not create a simple one-to-one lineage between concrete buildings and software interfaces, but the family resemblance is clear: both remove nonessential ornament so structure and use can come forward.
The comparison matters because flat design is not simply the absence of gradients. It is a decision about which signals deserve attention. When a designer removes depth, texture, and decoration, spacing, type, color, and layout have to do more of the work.
Mondrian nailed the Windows 8 UI in the 1940s
The principles of Modernism were expressed vividly in Piet Mondrian’s orthogonal compositions. I used to like them a lot more before Windows 8 came around. Now, whenever I look at those colored rectangles, I expect the squares to start spinning at uneven intervals.
Shudder.
The joke lands because Metro borrowed a similar visual grammar: strong blocks, asymmetrical balance, little decorative depth, and movement used as a navigational clue. The next stage in flat design’s formation combined that geometry with the discipline of Swiss typography.
Swiss Style and Helvetica
Bright geometric shapes, sans-serif typefaces, deliberate grids, and a lack of unnecessary shadow or depth. Look familiar? If the founders of Swiss Style had set up shop building SaaS landing pages, they would have been loaded.
Helvetica, developed in 1957 by Max Miedinger with Eduard Hoffmann, became one of the world’s most familiar sans-serif typefaces. Its popularity came from practicality. It remains legible at a distance and at small sizes, which made it useful for public signage and posters.
It is also no-frills. Unlike script and decorative serif faces, Helvetica does not mess around with unnecessary curls, flicks, and wiggles, which are the expert typographical terms. Swiss Style gave designers a system for organizing information without relying on ornament, exactly the problem flat interfaces would later face.
Technology imitates life
Software did not begin flat. Early graphical user interfaces had to teach people how to use an unfamiliar environment, so designers borrowed the layout and objects of a physical desk. Documents looked like paper, folders looked like folders, the trash can looked disposable, and controls looked pressable.
Apple kept this up for a long time. From ripped paper edges in calendars to varnished wooden shelves full of books, the assumption was that familiarity made new software easier to understand. Apple’s Aqua interface grew shinier over time, while Microsoft’s Aero on Windows Vista pushed glass, gradients, reflections, and transparency in the same direction.
That skeuomorphic approach was not foolish. Physical cues provided affordances: users could tell what was interactive because controls looked like objects they already knew how to operate. The trouble came when decoration overwhelmed content, or when familiar metaphors became constraints rather than guides.
Windows 8 set low standards for flat design
When Windows 8 arrived with its flat interface in 2012, plenty of people, myself included, were revolted. The sidebar appeared when I needed it least, accompanied by that ridiculous rectangle showing the time and date. Parts of the interface insisted on being full-screen, and the system mixed a touch-first tile environment with a traditional desktop in ways that rarely felt settled.
The visual language was bold. The interaction model was the problem. Flatness removed some of the cues people relied on, while the operating system also changed familiar navigation patterns. A beautiful screenshot could not compensate for uncertainty about where to click, swipe, or look.
Before flat design became the broad category name, Microsoft’s version was discussed as Metro. After iOS 7, the wider term became dominant, and the look separated itself from Windows 8’s reputation.
Apple did not invent the underlying principles, and Microsoft did not single-handedly cause the shift. But the sequence made flat design visible at platform scale. Microsoft’s severe experiment established the vocabulary; Apple’s more polished implementation helped normalize it.
What’s next after flat design?
Designer Wells Riley argued that design is a form of problem-solving. That is the standard flat interfaces must meet. Unlabeled icons may look elegant in a screenshot, but users still need to understand what controls do and which elements are interactive.
That weakness led to what is sometimes called flat 2.0. Modern interfaces reintroduced selective depth, state changes, motion, borders, elevation, and stronger contrast without returning to leather stitching and varnished shelves. Google’s Material Design made that compromise explicit by combining flat surfaces with spatial rules and motion. Apple’s current Human Interface Guidelines likewise emphasize hierarchy, legibility, consistency, and accessible interaction rather than flatness as an end in itself.
Accessibility sharpens the point. Color alone should not carry meaning, text and controls need sufficient contrast, focus states must be visible, and buttons must still look and behave like buttons. A clean interface succeeds only when it reduces cognitive load instead of hiding information.
So flat design did not end. It matured. The strongest interfaces now borrow Modernism’s discipline, Swiss Style’s hierarchy, and Metro’s confidence while restoring enough depth and feedback to remain usable.
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