Readable vs Accessible

When designers talk about type, these two words often get used interchangeably, but they’re not the same thing.

When designers talk about type, these two words often get used interchangeably, but they’re not the same thing. Readability is about ease of reading at speed. Accessibility is about whether a wider range of people can read it at all. One is about flow, the other is about access.

The readability of a font begins with its design. The micro-details of letterforms and spacing influence how easily we recognise and process text. Open counters, generous x-heights, balanced stroke contrast, and clear differentiation between similar characters (such as I, l and 1) all help improve legibility and reduce visual effort.

But readability doesn’t depend on the typeface alone. The way a font is set plays an equally important role. Line length, leading, justification, and hyphenation all affect how comfortably text can be read over longer passages. Letterforms that are spaced too tightly can feel cramped, while overly loose settings can disrupt the rhythm of reading. Readability is ultimately the result of both good type design and thoughtful typography working together to reduce friction in continuous reading.

On a type design level, this means considering:
Letterform clarity, spacing, x-height, counter openness, weight balance, contrast, character differentiation, harmony and balance of between inner and outer space of the letters, between letter, between words.

On a typesetting level, this means considering:
Font choice depending on the contest of use, size, leading, line length, justification, column width, size. This is what the designer using the font controls. Readability emerges from both.

Accessibility instead expands the usage of fonts, asking whether someone with low vision, dyslexia, colour blindness, or a screen reader can engage with the content at all. This is where contrast ratios, font weight flexibility, and responsive scaling come into play. Generally speaking, the neutrality of a font’s design is a strength in terms of accessibility, as overly expressive display fonts might be readable in ideal conditions but fail when resized or viewed on low-quality screens. Like with readability, accessibility is also affected by how fonts are applied. Semantic structure, proper use of headings, and compatibility with assistive tech matter as much as the letterforms themselves. In this sense, accessibility is less about the direct design of its letterforms and more about system design.

It’s also worth noting that research into accessibility and typography is still evolving. While there is broad agreement on many best practices, questions around how specific typeface characteristics affect readers with particular conditions, including dyslexia and other reading difficulties, remain the subject of ongoing study and debate.

The difference, then, is intent and scope. A typeface can be highly readable yet still inaccessible if it depends on fine visual distinctions or low contrast. Conversely, an accessible type system might feel slightly less elegant in ideal conditions, but it holds up across environments, devices, and abilities. Readable and accessible design sits at the overlap: where readability supports ease, and accessibility guarantees inclusion. For creatives – type designers and graphic designers alike – the challenge is not choosing one over the other, but understanding how decisions in spacing, form, and structure affect the bigger picture and the real-world use of their fonts.

If you’re interested in learning more, and how to make your font more accessible, check out Typotheque’s new, free toolkit built to help designers make more inclusive work.