Colour isn't decoration. It's how people navigate.

Design · 6 min read

During the design of an NDIS life management app, the client told me something that changed how I think about colour in apps. He said his clients recognise their weekly routines by colour, not by words. "It's a red day" means Monday. "Yellow day" means Wednesday. Not because anyone taught them a colour system. Because the service roster has always used coloured sheets, and over time, the colour became the meaning.

That's not a branding conversation. That's a navigation system hiding in plain sight.

When text isn't enough

Most of the people who'll use this app can't read fluently. Some can't read at all. That's not unusual in disability services. It's actually the majority. So the standard approach of labelling everything with text and calling it done doesn't work. The labels are invisible to a significant portion of the user base.

Research on colour and cognition shows that humans process colour 60,000 times faster than text. The Institute for Color Research found that colour increases brand recognition by up to 80%. But beyond marketing, colour is a cognitive shortcut. It lets people categorise, recognise, and navigate without reading.

For users who struggle with text, colour doesn't supplement the navigation. It is the navigation. A red circle on the calendar means the same thing every time. Monday. Medication. That service. The person doesn't need to read the label. They just need to see the colour.

How we designed the colour system

We assigned a distinct colour to each day of the week. Not random colours. Colours that complement each other naturally, work for colour-blind users when paired with text labels, and feel warm rather than clinical. The client had researched neurodivergent-friendly palettes: softer tones, no harsh contrasts, nothing that feels like a warning sign.

The colours appear everywhere that day matters. The calendar circles. The medication cards. The recurring event selectors. When you're adding a medication that repeats on Monday and Wednesday, the Monday checkbox is red and the Wednesday checkbox is yellow. The consistency means the colour builds meaning over time. It's not something users have to learn from a legend. They absorb it.

The WCAG 2.1 guidelines are clear that colour alone shouldn't be the only way to convey information. We respect that. Every coloured element also has a text label. But the colour is doing the heavy cognitive lifting for users who process visually rather than textually.

This applies to every app, not just accessibility apps

Look, I'm not saying every app needs day-of-week colour coding. But the principle is universal. Colour is information. If you're using colour purely for aesthetics, you're leaving a powerful tool on the table. Status indicators, priority levels, categories, progress states — all of these can be reinforced with colour in ways that make your app faster to parse and easier to navigate.

The mistake most designers make is treating colour as the last step. Pick the brand colours, apply them to buttons and headers, done. But if you start with "how will my users tell these things apart?" and work backwards, colour becomes a functional choice, not a decorative one.

For the people using this NDIS app, colour is the difference between understanding their week and staring at text they can't read. That's not a nice-to-have. That's the whole design working.

Sources
Color and the Brain (Institute for Color Research) - Colour increases recognition by up to 80%.
Understanding Use of Color (WCAG 2.1) - Colour should not be the sole means of conveying information.

Related blog posts:

Designing for the person who can't read your app →

Don't hide things from people who forget things →

Case study: NDIS life management app →