Best Colors for Reading Speed: What 341 Readers Taught Us

You're probably reading this on a white background with black text. It's the default everywhere — websites, documents, textbooks, apps. It seems like the obvious choice: maximum contrast, maximum readability. Right?

Wrong, according to the research. Black text on a white background is not the most readable combination — not for typical readers, not for dyslexic readers, and not for RSVP speed reading. Multiple peer-reviewed studies point to something far more interesting: color temperature matters, and warm backgrounds beat cool ones across the board.

The big study: Rello & Bigham, 2017

The most comprehensive study on reading colors to date was published at the ACM SIGACCESS Conference on Computers and Accessibility. Researchers Luz Rello and Jeffrey Bigham tested 341 participants (89 with dyslexia, 252 without) reading text on 10 different colored backgrounds. They measured reading time, mouse distance (a proxy for visual scanning effort), and comprehension.

The results were clear: warm background colors — Peach, Orange, and Yellow — significantly improved reading performance over cool background colors like Blue, Blue Grey, and Green. This held true for both dyslexic and non-dyslexic readers, with dyslexic readers showing even larger benefits.

The correlation between groups was strong (ρ = 0.964, p < 0.001), meaning the same colors that helped typical readers also helped dyslexic readers, just more so.

Other key findings

Black on yellow reads fastest

Wu and Yuan (2003) studied the effect of color on reading speed and found that the best results came from black text on green and black on yellow backgrounds. They also found that to improve reading speed, the text should be darker and the background lighter. Notably, black on white produced some of the worst results — despite being the universal default.

Gray is optimal for RSVP specifically

A 2020 study by Chuang and colleagues at Ludwig Maximilian University of Munich specifically tested background colors for RSVP reading while measuring pupil dilation (a physiological indicator of mental workload). They discovered that a gray background provides the best contrast for reading at various RSVP presentation speeds. Gray reduced mental workload more consistently than other colors across different reading rates.

Turquoise helps dyslexic children

A 2021 study published in PMC measured physiological responses (EEG, heart rate variability, electrodermal activity, and eye tracking) in children with and without dyslexia reading under 13 different color combinations. They concluded that turquoise background, turquoise overlay, and yellow background could be beneficial for children with dyslexia.

The dyslexia contrast paradox

Here's an interesting tension in the research. The Web Content Accessibility Guidelines (WCAG 2.0) require a minimum contrast ratio of 4.5:1 for normal text — essentially pushing toward high contrast. But the British Dyslexia Association recommends the opposite: dark (not black) text on a light (not white) background, using softer colors like cream. They specifically advise avoiding pure white because it can appear "too dazzling."

The research by Rello and Baeza-Yates (2012) helps explain this: people with dyslexia read faster using lower color contrasts than the control group — but these were still above the WCAG minimum threshold. The sweet spot is high enough contrast to be legible, but not so extreme that it creates glare.

ReadingQuick's 7 research-backed themes

Midnight (dark mode)

Light text on near-black. Best for: low-light environments, nighttime reading, reducing eye strain in dark rooms. While not explicitly tested in the color studies (which focused on light backgrounds), dark mode reduces overall screen luminance, which many readers find less fatiguing for extended sessions.

Cream

Dark text on warm cream. Recommended by the British Dyslexia Association. Avoids the "dazzling" effect of pure white while maintaining strong legibility. A comfortable, familiar reading experience similar to aged paper.

Peach

The top-performing warm background in the 341-person Rello and Bigham study. Warm enough to activate the readability benefit, subtle enough to not feel "tinted." Our most recommended theme for general speed reading.

Yellow Tint

Based on Wu and Yuan's finding that black on yellow produced the fastest reading speeds. Also supported by the PMC study as beneficial for dyslexic children. We use a soft tint rather than bright yellow to avoid overwhelming the display at large font sizes.

Turquoise

Specifically supported by the 2021 PMC physiological study for dyslexic readers. The cool-warm balance of turquoise creates a unique reading environment that some users find distinctly calming and focus-enhancing.

Gray

The only color specifically tested in an RSVP context (Chuang et al., 2020). Gray provided the best contrast across varying RSVP presentation speeds and reduced mental workload as measured by pupil dilation. If you're pushing high WPM, this is the evidence-based choice.

High Contrast

Pure black on white, WCAG 2.0 compliant. Included for users with low vision who need maximum contrast. While not optimal for speed or dyslexia, it's essential for accessibility compliance and serves users whose primary barrier is visibility rather than processing.

Custom colors

Everyone's visual system is different. The studies give us excellent starting points, but individual variation is real. That's why ReadingQuick also includes custom color pickers for text, background, and accent colors. Start from a research-backed preset, then tweak to your personal comfort. Your ideal combination might be a slightly warmer peach, a slightly cooler cream, or something else entirely.