If you’re designing a mobile app and want people with low vision to actually use it without squinting or giving up, your font choice isn’t just a design detail it’s the difference between usable and ignored. Low vision affects millions, and many apps unintentionally shut them out by picking fonts that look sleek but are impossible to read at small sizes or on bright screens.

What makes a font “good” for low vision users?

A font built for low vision needs clear letter shapes, generous spacing, and consistent stroke widths. It should avoid decorative curls, overly thin lines, or letters that look too similar (like uppercase I and lowercase l). Sans-serif fonts usually win here because they’re simpler and less cluttered.

Size matters, but so does contrast and spacing. Even a great font can fail if the text is tiny, crammed together, or placed over a busy background. That’s why accessibility guidelines like WCAG 2.1 AA matter they set real standards for how apps should handle readability. You can see which fonts meet those specs in our breakdown of fonts that follow WCAG rules.

Which fonts actually work well?

Here are a few that consistently perform for low vision users:

Atkinson Hyperlegible – Designed specifically for low vision, it exaggerates differences between similar characters. The “I” has serifs, the “0” has a dot inside small tweaks that prevent confusion.
OpenDyslexic – While aimed at dyslexia, its weighted bottoms help anchor letters visually, which also helps people with blurry vision keep their place.
Inter – A clean, modern sans-serif with tall x-height and open counters. Works well even at small sizes and across iOS and Android. More options like this are listed in our guide to fonts that work across platforms.
Noto Sans – Google’s answer to universal legibility. Covers hundreds of languages and includes variants optimized for screen reading.

What do people often get wrong?

Too many designers pick fonts based on how they look in a hero banner not how they perform in body text at 14pt on a phone held at arm’s length. Common mistakes:

Using light or condensed weights because they “look elegant.” They vanish in sunlight or for aging eyes.
Ignoring line height and letter spacing. Tight text is exhausting to read, even with a good font.
Assuming system fonts are enough. While San Francisco (iOS) and Roboto (Android) are decent, they’re not always the best for impaired vision. Customizing or swapping them can make a big difference, especially for older users check out fonts that work better for seniors.

How do you test if your font works?

Don’t guess. Test with real people who have low vision. If that’s not possible, simulate it: turn on grayscale mode, reduce brightness, or view your app from across the room. Does the text still feel easy to scan? Can you tell “rn” apart from “m”? Is there enough breathing room between lines?

You can also use tools like Stark or Lighthouse to check contrast ratios and font size compliance. But nothing beats watching someone actually try to read your interface.

What’s the next step?

Pick one font from the list above and swap it into your app’s body text. Don’t redesign everything just change the main reading font and test it. See if users notice. See if support tickets about readability drop. Small changes here create big wins for real people.

Quick checklist before you ship: