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OpenDyslexic Mono for programmers — a practical review
Most conversations about OpenDyslexic focus on reading prose — articles, books, web pages. But there is a lesser-known companion typeface, OpenDyslexic Mono, built specifically for the context where many dyslexic programmers struggle most: reading and writing code. This review looks at what the font actually does, how it performs in a real coding workflow, and whether it is genuinely the best option or simply the most obvious one.
What is OpenDyslexic Mono?
OpenDyslexic Mono is the monospaced variant of the OpenDyslexic type family, created by Abelardo Gonzalez and released under the SIL Open Font License. Like its proportional sibling, it is built around a single core idea: every glyph has a visually heavier bottom than top, so that letters cannot be mentally rotated or reflected without looking distinctly different. The lowercase b, d, p, and q — which many dyslexic readers report as interchangeable in normal typefaces — each carry a unique weight distribution that anchors them in space.
The "Mono" variant preserves all of these design choices while making every character exactly the same width. That constraint is non-negotiable for code: Python indentation, column-aligned comments, and character-by-character terminal output all depend on fixed-width spacing. You cannot use a proportional font like the regular OpenDyslexic in a code editor without breaking the visual structure that makes code readable.
The font is available free from the OpenDyslexic GitHub repository and from several font distribution sites. Installation on macOS, Windows, and Linux follows the same process as any system font.
Why code is particularly hard with dyslexia
Reading code is not just reading text. It makes demands that standard prose does not, and several of those demands intersect directly with the difficulties dyslexia causes.
The most immediate problem is identifier confusion. In a language like Python, JavaScript, or C, variable names, function names, and keywords often differ by a single letter, one character in a different case, or a subtle transposition — count vs const, parse vs spare, db vs dp. Dyslexic readers who transpose letters when reading prose do the same with identifiers, and in code the cost is a bug rather than a misread word. The brain has no surrounding context to self-correct the way it does in natural language.
The second problem is bracket and delimiter matching. Parentheses, square brackets, and curly braces all have near-mirror-image pairs. Some dyslexic programmers report difficulty distinguishing ( from ) or [ from ] at a glance, particularly in dense expressions where they nest several levels deep. Editor features like bracket-pair colorization help, but they do not address the underlying perceptual difficulty.
Third, scanning vertically through indented code requires the eye to move with precision from one line to the next without losing its horizontal position. Readers who struggle to hold their place on the line in prose — a very common experience with dyslexia — find this even harder when the relevant content starts at different indent levels on every line. For more on this, see our post on why dyslexic readers lose their place on the page.
A monospaced dyslexia-specific font like OpenDyslexic Mono targets the first of these problems directly. It also has some effect on the third, since the heavier bottoms provide a clearer baseline that helps anchor the eye. It does not, by design, do much about bracket confusion — the paired delimiters are not redesigned in a way that makes them more visually distinct from each other.
How OpenDyslexic Mono performs in practice
The main benefit most programmers report when switching to OpenDyslexic Mono is reduced effort on letter-confusion errors. When a variable is named dbPool, the d and b look unambiguously different because they have different weight distributions. Over a long coding session, this reduction in second-guessing adds up. You spend less cognitive effort double-checking whether you read a name correctly, and that headroom goes back to the actual problem you are solving.
The weaknesses are also real. OpenDyslexic Mono was designed as an accessibility font rather than a typography-first coding font. At typical editor sizes (12–14 pt), the letterforms can feel heavy and slightly compressed. The font has fewer hinting optimisations than fonts built specifically for screen rendering, which means it can look slightly blurrier on Windows displays that rely on ClearType. And because the glyph shapes are unconventional, syntax highlighting and editor themes designed around standard fonts may feel slightly off — colour contrasts that look good with Fira Code or JetBrains Mono are sometimes harder to judge with OpenDyslexic Mono's thicker strokes.
// These pairs are visually distinct in OpenDyslexic Mono:
// b d p q — each has a unique bottom-weighted shape
// In standard monospace, they differ only in stem position
const db = connectDatabase(); // db vs dp vs dq — unambiguous
let parseInput = (buf) => { ... }; // p and b both anchored by weight
On balance, programmers who experience letter rotation or confusion as a specific, named part of their dyslexia will likely get genuine benefit from the font. Those whose primary difficulty is with reading speed, line tracking, or word-level decoding may find the improvements marginal relative to what a more polished coding font with good dyslexia-relevant spacing can offer.
The alternatives worth comparing
OpenDyslexic Mono is not the only option for dyslexic programmers. Three other fonts come up repeatedly in discussions among developers with dyslexia, and each takes a different approach.
Fira Code
Fira Code is a proportional monospace font from Mozilla, well-known for its programming ligatures — pairs like !=, ->, and === are rendered as single visual units rather than two or three separate characters. For dyslexic readers who find token-by-token parsing of operators effortful, the ligatures reduce the number of distinct shapes to process. The letterforms are clean, slightly wide, and well-hinted for screen rendering. Fira Code does not have OpenDyslexic Mono's weighted bottoms, but many dyslexic programmers find its generous spacing and clear shapes more comfortable than the average coding font. See our broader look at reading code with dyslexia for more context on what makes code typography easier or harder.
JetBrains Mono
JetBrains Mono was explicitly designed with developer ergonomics in mind, including features meant to reduce eye strain over long sessions. It has a generous x-height, slightly increased character width, and — notably — a higher level of distinction between commonly confused character pairs: 1, l, and I are all clearly different; 0 and O are visually distinct without a slashed zero. JetBrains Mono does not carry the dyslexia-specific weighted-bottom design of OpenDyslexic Mono, but its deliberate disambiguation of visually similar characters addresses one of the same problems from a different angle. For many dyslexic programmers who try both, JetBrains Mono wins on aesthetics and screen rendering quality while OpenDyslexic Mono wins on the specific b/d/p/q problem if that is their primary difficulty.
Cascadia Code
Microsoft's Cascadia Code, shipped as part of Windows Terminal, combines ligature support with a clean geometric design. Like Fira Code, it is well-hinted and pleasant to look at for long sessions. It does not have dyslexia-specific design features, but its generous spacing and clear baseline make it a reasonable default for programmers who want something less visually aggressive than OpenDyslexic Mono while still being more readable than the historic defaults (Courier New, Consolas, Monaco).
| OpenDyslexic Mono | Fira Code | JetBrains Mono | |
|---|---|---|---|
| b/d/p/q disambiguation | Yes — weighted bottoms | No | Partial (stem placement only) |
| 1/l/I disambiguation | Partial | Good | Excellent |
| Ligatures | No | Yes | Yes |
| Screen rendering | Adequate | Excellent | Excellent |
| Visual weight at 13pt | Heavy | Normal | Normal |
| Open source | Yes (SIL) | Yes (SIL) | Yes (Apache 2.0) |
In the editor versus in the browser
Installing OpenDyslexic Mono in a code editor is straightforward: download the font files, install them to your operating system, then set "editor.fontFamily": "OpenDyslexic Mono" in your editor settings. VS Code, JetBrains IDEs, Sublime Text, Neovim, and every other major editor respects the system font and lets you set it per-profile or per-project. This gives you full control over your local development environment.
The browser is a different story. When you are reading code on GitHub, reviewing a pull request, scanning answers on Stack Overflow, reading documentation on MDN or ReadTheDocs, or working through a tutorial — you have no control over the font the site uses. Those sites default to a system monospace font (usually Menlo on macOS, Consolas on Windows, or DejaVu Sans Mono on Linux) that was chosen for the average reader, not for someone with dyslexia.
This is where a browser-level font override becomes relevant. LexiFont can apply a custom font to every element on every page, including <code> and <pre> blocks. If you have OpenDyslexic Mono installed on your system and set LexiFont to use it, your preferred coding font follows you to every site you visit — GitHub, Stack Overflow, documentation pages, all of it. Our post on reading GitHub with dyslexia covers this workflow in more detail, and the Stack Overflow equivalent shows the same approach applied to answers and code snippets there.
You can also use LexiFont to apply a proportional dyslexia-friendly font like OpenDyslexic or Lexend to the surrounding prose on those pages, while leaving code blocks in OpenDyslexic Mono — or whatever monospace font you prefer. The two layers do not conflict.
Who should try OpenDyslexic Mono
The honest answer is: try it if letter confusion — specifically the rotation or transposition of b/d/p/q — is a named, specific part of your reading experience when writing code. If you look at a variable called db_pool and have to consciously check whether it says db or dp, OpenDyslexic Mono is directly targeting that problem and is worth a week's trial.
If your difficulty with code is more about reading speed, attention drift, or losing your place between lines, the font will help somewhat (the weighted baseline aids line tracking) but the gains may be smaller than what you get from adjusting line height, font size, or background contrast — things that apply regardless of typeface. Our post on screen brightness and contrast for dyslexia and our guide on the best fonts for dyslexia in 2026 cover those levers in more depth.
If you find OpenDyslexic Mono's visual weight uncomfortable after a few days — it is a heavier font than most developers are used to — do not force it. JetBrains Mono, with its explicit disambiguation of look-alike characters, may be the better middle ground. It will not solve the b/d/p/q problem at the same level, but it is significantly easier on the eyes over a full working day, and the 1/l/I and 0/O disambiguation it provides addresses a different but equally common source of errors.
A practical trial protocol: install OpenDyslexic Mono alongside your current editor font. Use it for your morning coding session — the first two hours, before you are fatigued. Note whether you catch yourself second-guessing identifiers less often. If yes, run it for a full week. If after a week the heavy letterforms are bothering you more than the disambiguation is helping, switch to JetBrains Mono and compare. Most people know by the end of the first week which approach suits them.
Installing OpenDyslexic Mono
The font is available at no cost from the OpenDyslexic itch.io page and from the project's GitHub repository. Download the zip archive, extract the .otf or .ttf files, and install them like any other system font. On macOS, double-click the file and click Install. On Windows, right-click and choose Install. On Linux, copy the files to ~/.local/share/fonts/ and run fc-cache -fv.
Once installed, set it in your editor of choice:
"editor.fontFamily": "'OpenDyslexicMono', 'Courier New', monospace", "editor.fontSize": 14, "editor.lineHeight": 1.6
The increased line height (1.6 rather than the default 1.4 or so) is worth setting regardless of which font you choose. It costs nothing in terms of information density and makes a meaningful difference for line-tracking. See our post on line spacing and letter spacing for dyslexia for the reasoning behind this.
For in-browser use, install LexiFont, make sure OpenDyslexic Mono is installed on your system, and enter the font name in LexiFont's custom font field. It will apply to code blocks on every site you visit. The LexiFont Pro tier lets you set different fonts for different sites, so you can use OpenDyslexic Mono on GitHub and a proportional font on your regular reading.
The bottom line
OpenDyslexic Mono is a legitimate tool with a clear and specific purpose. It reduces the perceptual cost of reading code for programmers who experience b/d/p/q letter confusion, and it is the only monospace font built around that design goal. Its weaknesses — heavier visual weight, less polished screen hinting compared to purpose-built coding fonts — are real but manageable, especially if you adjust your editor's font size and line height to compensate.
It is not the only good answer. Fira Code and JetBrains Mono both serve dyslexic programmers well through different means: better ligatures, clearer disambiguation of a different set of look-alike characters, and more polished rendering. The right choice depends on which specific errors your dyslexia produces when reading code.
If you have never deliberately tried a dyslexia-focused font for code, OpenDyslexic Mono is a reasonable first experiment. Download it, try it for a week in your editor, and extend it to the browser with LexiFont. A week is usually enough to know whether the design is solving your actual problem or simply being different in a way that does not help.