Monospace · Chay Choong
Opus One
Find the font. Find its kind.
CSSfont-family: 'Opus One', monospace; font-weight: 400; font-style: normal; line-height: 1.1;
Opus One is a free monospace font by Chay Choong, from its maker’s repository on GitHub. Among the 99 monospaced fonts on FontKind, Opus One has an x-height taller than 67%, is of average width and, at its regular weight, is of average darkness. Its thickest strokes are 1.0 times its thinnest: nearly even strokes.
01 / Light table
Laid on top of JetBrains Mono
Opus One on one light table with its two closest fonts, JetBrains Mono (85 out of 100) and Victor Mono (82). JetBrains Mono has an x-height 4% taller and more stroke contrast; Victor Mono is 13% lighter, with an x-height 17% taller.
Opus One and JetBrains Mono laid on top of each other.
Ink shared with Opus OneJetBrains Mono…
Most different letters first; the figure is the share of ink the fonts have in common. Where the fonts agree the letters cancel to black: every white sliver is a real difference.
02 / Letters
The Opus One alphabet
Capitals, lowercase, figures and signs · weight 400
Tap the letters you like, here and in other fonts, to find the fonts whose letters look most like them.
- &
- ?
- !
- @
- %
- (
- )
03 / Weights
Opus One in 2 weights
2 weights, 400–700, with italics
- 400 Regular, with its italic
- 700 Bold, with its italic
04 / Facts
Who made Opus One, and can you use it?
- Designer
- Chay Choong
- Kind
- Monospace
- Styles
- 2 weights, 400–700, with italics
- From
- GitHub
- Character sets
- latin
- Licence
- SIL Open Font License 1.1
Can I use it?
- Commercial use
- Yes.
- Logos
- Yes.
- Websites and apps
- Yes. Self-hosted.
- PDFs and documents
- Yes.
- Changes
- Yes.
- Sharing the files
- Yes, but not for sale. With the licence.
Opus One is under the SIL Open Font License 1.1. This is a plain summary, not legal advice: the licence itself decides.
Already in your apps?
- Google Docs
- Not verified. Docs adds Google Fonts, and Opus One comes from its maker’s repository on GitHub. Google’s guide
- Word, PowerPoint
- Not verified. Install it from its maker’s repository on GitHub first. Microsoft’s list
- Figma
- Not verified. Search its font menu, or install it. Figma’s help
- Canva
- Not verified. Search its font menu for Opus One, or upload it with Canva Pro. Canva’s help
- Cricut
- Once installed. Design Space lists Opus One under System. Fonts for Cricut →
From each app’s own font list or help pages.
05 / Measurements
Opus One, measured
Taken from the font file's own outlines, regular style
- x-height
- 53.0% of the emlowercase x
- Cap height
- 70.0% of the emcapitals
- x / cap
- 0.76lowercase against capitals
- Width
- 60.0% of the emaverage lowercase
- Ink
- 37%letter box filled
- Contrast
- 1.00 : 1nearly even strokes
Where it stands among monospaced fonts
Ranked against all 99 monospaced fonts on FontKind
x-heightLarger than 67% of monospaced fonts
WidthNear the middle of monospaced fonts
InkNear the middle of monospaced fonts
ContrastMore even than 87% of monospaced fonts
06 / Similar fonts
Fonts similar to Opus One
Matched letter by letter · its own family apart
- JetBrains Mono85x-height 4% taller · more stroke contrast
- Victor Mono82x-height 17% taller · 13% lighter
- Cousine79more stroke contrast
- Monaspace Neon75more stroke contrast · 9% heavier · 3% wider
- Noto Sans Mono74more stroke contrast
- DejaVu Mono74more stroke contrast · x-height 3% taller
All 100 fonts similar to Opus One →Compare side by side →Get Opus One on GitHub
07 / Swap
Swap Opus One without a jump
Running text within 3% of the width, x-height within 5%
- JetBrains Mono85same text width · x-height 3.8% taller
- Cousine79same text width · same x-height
- Noto Sans Mono74same text width · x-height 1.1% taller
- DejaVu Mono74same text width · x-height 3.2% taller
- Tabular73same text width · x-height 2.3% taller
- IBM Plex Mono72same text width · x-height 2.6% shorter
Fallback while it loads
Until Opus One loads, this sets Courier New in its place at 100% of its size, so running text keeps Opus One’s width and lines keep their height: nothing moves when it arrives.
@font-face {
font-family: 'Opus One Fallback';
src: local('Courier New');
size-adjust: 99.98%;
ascent-override: 98.02%;
descent-override: 28.00%;
line-gap-override: 0.00%;
}
font-family: 'Opus One', 'Opus One Fallback', monospace;08 / Questions
Questions about Opus One
Answered from its licence, GitHub and each app’s own font list
Is Opus One free for commercial use?
Yes. Opus One is under the SIL Open Font License 1.1 , which allows commercial use at any scale, logos, websites, apps and PDFs included.
How do I download and install Opus One?
Opus One comes free from its maker’s repository on GitHub . On its repository there, choose Code, then Download ZIP, and unzip the file: the fonts are in its fonts/ttf folder. On Windows or a Mac, double-click each TTF or OTF file and choose Install, then restart any app that was open. The web fonts this page uses load from its repository, through jsDelivr, as does its licence file .
Is Opus One in Google Docs?
Probably not: the More fonts list in Docs draws on Google Fonts, and Opus One comes from its maker’s repository on GitHub. Docs can’t add a font of your own, so set it in an app on your computer, such as Word, instead.
How many weights does Opus One have?
Opus One comes in two weights: Regular (400) and Bold (700), each with an italic.
Who designed Opus One?
Opus One was designed by Chay Choong.
What fonts are similar to Opus One?
The closest in our letter-by-letter match are JetBrains Mono (85), Victor Mono (82) and Cousine (79), out of 100. Next to Opus One, JetBrains Mono has an x-height 4% taller and more stroke contrast. See all 100 fonts like Opus One.