Why We Don't Use Bright Colours

Open most apps made for toddlers and your eyes do the work for you: neon pink buttons, electric blue backgrounds, fire-engine red everything. The assumption seems to be that small children need maximum visual volume at all times. The research points in a different direction.

Colour affects how the brain processes information

Andrew Elliot's colour-in-context theory, developed across two major reviews in Frontiers in Psychology (2015) and Review of General Psychology (2019), found that viewing red in evaluative or achievement contexts tended to increase caution and avoidance behaviour in adults (Elliot, 2015). Red appeared to activate right frontal cortical areas associated with threat processing, though Elliot himself cautioned that the field is still at an early stage and that colour effects depend on age, culture, and context.

For children specifically, the evidence is thinner but points in the same direction. Gil and Le Bigot (2016) showed children aged 5 to 10 a series of ambiguous faces against red, grey, or green backgrounds. The children gave significantly more "feel bad" responses when the face appeared on red (Gil, 2016). The association appeared to develop with age, suggesting it is partly learned through cultural exposure (red pen for errors, red for warnings) rather than purely innate.

Too much colour competes for attention

A 2016 pilot study by Stern-Ellran and colleagues at the Interdisciplinary Center Herzliya tested 15 preschoolers (mean age around 3.7 years) on puzzles and building tasks using colourful versus plain white play surfaces (Stern-Ellran, 2016). The colourful surfaces produced a 2.5-fold increase in interference behaviours for puzzles and a 4.5-fold increase for building tasks. Interference included looking away, dropping pieces, frustration vocalisations, and searching manually rather than visually.

It was a small study. But it fits a broader pattern. Fisher, Godwin, and Seltman (2014) found that kindergartners in highly decorated classrooms spent 38.6% of their time off-task, compared to 28.4% in sparse classrooms, and scored 42% on tests versus 55% in the simpler rooms (Fisher, 2014). The visual environment was competing with the lesson for the children's limited attentional resources.

Calmer colours, calmer brains

Blue and green environments are consistently linked to lower arousal. A preliminary study by Minguillon and colleagues (2017) found that adults relaxed approximately three times faster under blue lighting than white after a stress task (Minguillon, 2017). Mehta and Zhu (2009) tested 600 participants across six experiments and found that blue environments produced twice as many creative outputs as red ones, while red boosted detail-oriented accuracy (Mehta, 2009).

Most of this research uses adult participants. Direct evidence with 2- to 4-year-olds in digital interfaces is genuinely sparse. But the convergent signal across age groups and contexts is that cooler, less saturated palettes appear to support focus and reduce overstimulation, while highly saturated warm tones tend to increase arousal.

What we chose instead

Toddler Games uses a muted palette built in OKLCh colour space: teal for interactive elements, soft greens for accents, warm beige and cream for backgrounds. Red appears only where it makes contextual sense. Pizza sauce is red. Tomato toppings are red. These are real-world associations that toddlers recognise, and they appear as part of the game illustration rather than the surrounding interface.

Red is reserved for real-world context: pizza sauce, tomato toppings. The visual environment around the game is deliberately calm so that the game itself gets the attention.

Worth saying plainly: the evidence base for colour and young children in digital interfaces is small. Most studies have limited sample sizes and use adult populations. When we had to pick a direction, we picked the one the research cautiously supports. Colour is one piece. Pacing is another.