A dyslexia font is a typeface specifically designed to make letters easier to distinguish for people with dyslexia. The most well-known examples, OpenDyslexic and Dyslexie, use heavier bottom portions on letters, unique character shapes, and wider spacing to reduce the visual confusion that can happen when similar-looking letters like “b,” “d,” “p,” and “q” appear close together. These fonts have gained significant popularity online, but the scientific evidence behind them tells a more complicated story than their marketing suggests.
How Dyslexia Fonts Are Designed
Standard fonts treat letters as symmetrical, interchangeable shapes. A lowercase “b” is often a mirror image of “d,” and “p” is a flipped “q.” For readers with dyslexia, who may already struggle with letter orientation, this symmetry creates extra friction. Dyslexia fonts attempt to solve this by making every character look distinctly different from every other character.
The design changes typically include several features working together. Letters get simplified, more straightforward shapes to reduce confusion between look-alikes. The parts of letters that rise above the main body (like the top of “b” or “h”) and the parts that drop below the baseline (like the tail of “g” or “y”) are made more prominent, so each letter has a more unique silhouette. Spacing between letters and between words is increased to prevent visual crowding, a known problem for many dyslexic readers. Letters tend to be open and rounded rather than narrow and angular, and the overall weight of the font is bolder to make characters stand out more on the page.
OpenDyslexic, the most widely available dyslexia font, adds a distinctive visual trick: each letter is heavier at the bottom than the top. The idea is that this weighted base “anchors” the letter, making it harder for your brain to mentally rotate or flip it. Dyslexie, another popular option, uses a similar philosophy but with slightly different letter shapes.
What the Research Actually Shows
Despite their popularity, dyslexia fonts have not performed well in controlled studies. A peer-reviewed study published through the National Institutes of Health tested OpenDyslexic against Arial and Times New Roman with elementary students diagnosed with dyslexia. The researchers measured letter naming, word reading, and nonsense word reading. The results showed no improvement in reading rate or accuracy for individual students or the group as a whole. None of the participants reported preferring to read material presented in the dyslexia font, either.
Earlier research found similar results. A 2010 study comparing Arial and the Dyslexie font with 21 Dutch students who had dyslexia found that Dyslexie did not lead to faster reading, though it may have helped reduce certain types of dyslexia-related errors. That’s a narrow benefit, and far from the transformative reading experience these fonts are often promoted as providing.
The researchers put it bluntly: “Currently, there is no documentation to support a specialized font is an evidence-based practice.” Given how much attention these fonts receive online, that’s a significant gap between perception and proof.
What Does Help: Spacing and Formatting
While the letter shapes in dyslexia fonts haven’t shown clear benefits, one element of their design does have solid research support: spacing. A landmark study by Zorzi and colleagues showed that extra-large letter spacing (roughly 18% larger than standard) genuinely improves reading for children with dyslexia. This is one of the most consistently replicated findings in dyslexia typography research.
This means you can get the most evidence-backed benefit of a dyslexia font without using one at all. Increasing letter spacing, word spacing, and line height in whatever font you’re already reading can make a real difference. Many e-readers, browser settings, and document editors let you adjust these values directly.
Other formatting choices matter too. Clean sans-serif fonts like Arial, Verdana, Tahoma, and Helvetica are widely recommended for accessibility by organizations like the University of California, Riverside’s Student Disability Resource Center. These fonts have simple, uncluttered letter shapes without the decorative strokes of serif fonts, and they’re available on virtually every device. A font called Atkinson Hyperlegible, originally designed for low-vision readers, has also gained a following among people with dyslexia for its distinctly shaped characters.
Accessibility Standards and Font Choice
If you’re wondering whether any official guidelines require dyslexia fonts, the answer is no. Neither the Web Content Accessibility Guidelines (WCAG) nor Section 508 federal standards specify particular typefaces or even a minimum font size. Instead, these standards focus on factors with stronger evidence behind them: sufficient contrast between text and background (at least a 4.5:1 ratio for normal text), the ability for users to resize text up to 200% without breaking the page layout, and ensuring that content still works if a reader adjusts letter or line spacing through assistive technology.
These standards reflect what the research supports. Contrast, resizability, and flexible spacing have a bigger measurable impact on readability than any specific font choice.
How to Try Dyslexia Fonts
If you want to test whether a dyslexia font works for you personally, several free options exist. OpenDyslexic is available as a Google Chrome browser extension that converts website text into the font automatically. The Kindle app supports custom fonts, and users can sideload OpenDyslexic or Dyslexie onto their devices. Some readers report that these fonts feel more comfortable even if objective reading speed doesn’t change, and subjective comfort has its own value during long reading sessions.
Dyslexie offers a free version for personal use, though it isn’t preinstalled on most devices and typically needs to be downloaded separately. Both fonts can be installed system-wide on Windows and Mac computers, making them available in word processors and other applications.
A practical approach is to experiment with both a dyslexia font and a clean sans-serif font like Arial or Verdana with increased spacing. Try each for a week of regular reading and see which feels less fatiguing. The “best” font for dyslexia varies from person to person, and individual preference matters more than any single design philosophy. What the evidence does support clearly is that wider spacing, good contrast, and a readable font size will do more for your reading experience than the specific shape of the letters.