web: add OpenTUI Mono typeface (#1404)

Replace Commit Mono with a project-owned Iosevka build so the site typeface can evolve with OpenTUI's visual identity. Add a private font lab to compare future builds before publishing them.
2026-09-19 01:26:03 +08:00 · 2026-08-22 11:11:30 +02:00
parent ea89dcd083
commit eaf1d41e92
27 changed files with 778 additions and 111 deletions
@@ -18,7 +18,7 @@ Remove an element when spacing, order, plain text, or standard HTML can do the s

 - Use black text on a white background, or the dark-mode equivalent.
 - Use the standard browser link color, but do not use the visited color.
- Use Commit Mono as the primary typeface. Use the OpenTUI wordmark as the main brand element.
+- Use OpenTUI Mono as the primary typeface. Use the OpenTUI wordmark as the main brand element.
 - Use whitespace and standard HTML elements to separate ideas.
 - Do not add cards, panels, badges, decorative rules, gradients, shadows, rounded containers, or ornamental backgrounds.
 - Do not add an element only to fill empty space.
@@ -70,7 +70,10 @@ export default defineConfig({
  integrations: [
    mdx(),
    sitemap({
-      filter: (page) => new URL(page).pathname !== "/404/",
+      filter: (page) => {
+        const path = new URL(page).pathname
+        return path !== "/404/" && !path.startsWith("/lab/")
+      },
    }),
  ],
  site: "https://opentui.com",
@@ -1,88 +0,0 @@
-Copyright (c) 2023 Eigil Nikolajsen (eigi0088@gmail.com)
-
-This Font Software is licensed under the SIL Open Font License, Version 1.1.
-This license is copied below, and is also available with a FAQ at:
-http://scripts.sil.org/OFL
-
-----------------------------------------------------------
-SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
-----------------------------------------------------------
-
-PREAMBLE
-The goals of the Open Font License (OFL) are to stimulate worldwide
-development of collaborative font projects, to support the font creation
-efforts of academic and linguistic communities, and to provide a free and
-open framework in which fonts may be shared and improved in partnership
-with others.
-
-The OFL allows the licensed fonts to be used, studied, modified and
-redistributed freely as long as they are not sold by themselves. The fonts,
-including any derivative works, can be bundled, embedded, redistributed
-and/or sold with any software provided that any reserved names are not used
-by derivative works. The fonts and derivatives, however, cannot be released
-under any other type of license. The requirement for fonts to remain under
-this license does not apply to any document created using the fonts or their
-derivatives.
-
-DEFINITIONS
-"Font Software" refers to the set of files released by the Copyright
-Holder(s) under this license and clearly marked as such. This may include
-source files, build scripts and documentation.
-
-"Reserved Font Name" refers to any names specified as such after the
-copyright statement(s).
-
-"Original Version" refers to the collection of Font Software components as
-distributed by the Copyright Holder(s).
-
-"Modified Version" refers to any derivative made by adding to, deleting,
-or substituting -- in part or in whole -- any of the components of the
-Original Version, by changing formats or by porting the Font Software to a
-new environment.
-
-"Author" refers to any designer, engineer, programmer, technical writer or
-other person who contributed to the Font Software.
-
-PERMISSION AND CONDITIONS
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of the Font Software, to use, study, copy, merge, embed, modify, redistribute,
-and sell modified and unmodified copies of the Font Software, subject to the
-following conditions:
-
-1) Neither the Font Software nor any of its individual components, in
-Original or Modified Versions, may be sold by itself.
-
-2) Original or Modified Versions of the Font Software may be bundled,
-redistributed and/or sold with any software, provided that each copy contains
-the above copyright notice and this license. These can be included either as
-stand-alone text files, human-readable headers or in the appropriate
-machine-readable metadata fields within text or binary files as long as those
-fields can be easily viewed by the user.
-
-3) No Modified Version of the Font Software may use the Reserved Font Name(s)
-unless explicit written permission is granted by the corresponding Copyright
-Holder. This restriction only applies to the primary font name as presented
-to the users.
-
-4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
-Software shall not be used to promote, endorse or advertise any Modified
-Version, except to acknowledge the contribution(s) of the Copyright Holder(s)
-and the Author(s) or with their explicit written permission.
-
-5) The Font Software, modified or unmodified, in part or in whole, must be
-distributed entirely under this license, and must not be distributed under
-any other license. The requirement for fonts to remain under this license does
-not apply to any document created using the Font Software.
-
-TERMINATION
-This license becomes null and void if any of the above conditions are not met.
-
-DISCLAIMER
-THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT,
-TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR
-ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, SPECIAL,
-INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN AN ACTION OF
-CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR INABILITY TO USE
-THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE FONT SOFTWARE.
@@ -0,0 +1,96 @@
+These files are OpenTUI Mono. Iosevka v34.4.0 compiled them with the plan
+in packages/web/src/font/private-build-plans.toml.
+
+Copyright (c) 2015-2026, Belleve Invis (belleve@typeof.net).
+Copyright (c) 2025, Ahmed Hatem (https://github.com/ahatem).
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this License and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
@@ -0,0 +1,96 @@
+These files are OpenTUI Mono. Iosevka v34.4.0 compiled them with the plan
+in packages/web/src/font/private-build-plans.toml.
+
+Copyright (c) 2015-2026, Belleve Invis (belleve@typeof.net).
+Copyright (c) 2025, Ahmed Hatem (https://github.com/ahatem).
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this License and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
@@ -159,7 +159,7 @@ Use this minimum ratio for a full-width composition:
 cols / rows >= (boxWidth / boxHeight) * (lineToEm / chToEm)
 ```

-For Commit Mono, `chToEm` is approximately `0.6` and `lineToEm` is approximately `1.1`.
+For OpenTUI Mono, `chToEm` is approximately `0.6` and `lineToEm` is approximately `1.1`.

 A media-area ratio from `1.2` to `1.3` usually needs a recording ratio from approximately `2.2` to `2.4`.

@@ -1,4 +1,5 @@
 User-agent: *
 Allow: /
+Disallow: /lab/

 Sitemap: https://opentui.com/sitemap-index.xml
@@ -65,9 +65,9 @@ for (const heading of Astro.props.headings) {
    margin-block-start: 0.25rem;
  }

-  /* The outline is orientation, not navigation: it stays in the text color
-   * so the link color keeps marking real links. The section being read is
-   * bold; Commit Mono bold keeps the same advance width, so nothing
+  /* The outline is orientation, not navigation. It stays in the text color
+   * so the link color keeps marking real links. The current section is
+   * bold. OpenTUI Mono bold keeps the same advance width, so nothing
   * shifts as the marker moves. (a:visited keeps the global rule from
   * recoloring visited anchors.) */
  a,
@@ -0,0 +1,37 @@
+# OpenTUI Mono
+
+OpenTUI Mono is the typeface for the site. Iosevka compiles
+`private-build-plans.toml` into static WOFF2 files. Iosevka does not write
+an OpenType variable font.
+
+The live files are Regular, Bold, Italic, and Bold Italic in
+`public/fonts/`. `/lab/font` compares those files with the next compile in
+`public/fonts/candidate/`.
+
+## Plan
+
+The plan sets glyphs, metrics, weights (100 to 900), and widths (Normal +
+SemiCondensed). Ligatures are off. The plan makes one web-subset family.
+Change keys in the plan. Do not start from a blank UFO or FontForge file.
+
+Identity glyphs: `a g l I 1 0 8 6 9 @ { } ( ) _ *`.
+
+These keys change the look first: `sb`, width `shape`, `xHeight`,
+`archDepth`, and the identity keys in `variants.design`.
+
+## Compile
+
+You need Node 18+ and a clone of [Iosevka](https://github.com/be5invis/Iosevka)
+at `v34.4.0`. You do not need `ttfautohint` for `webfont-unhinted`.
+
+```
+git clone --depth 1 --branch v34.4.0 https://github.com/be5invis/Iosevka.git
+cp packages/web/src/font/private-build-plans.toml Iosevka/
+cd Iosevka && npm install
+npm run build -- --jCmd=4 webfont-unhinted::OpenTUIMono
+```
+
+Copy the next compile into `packages/web/public/fonts/candidate/` as
+`OpenTUIMono-{Regular,Bold,Italic,BoldItalic}.woff2`. Compare it with
+the live files at `/lab/font`. When you accept the next compile, copy those
+four files to `packages/web/public/fonts/`.
@@ -0,0 +1,256 @@
+# OpenTUI Mono. Iosevka build plan.
+#
+# Iosevka v34.4.0. Static instances. Not an OpenType variable font.
+# Ligatures are off. One web-subset family.
+#
+#   cp this file to Iosevka/private-build-plans.toml
+#   npm install
+#   npm run build -- --jCmd=4 webfont-unhinted::OpenTUIMono
+#   copy dist/OpenTUIMono/WOFF2-Unhinted/OpenTUIMono-{Regular,Bold,Italic,BoldItalic}.woff2
+#     to packages/web/public/fonts/candidate/
+
+[buildPlans.OpenTUIMono]
+family = "OpenTUI Mono"
+spacing = "normal"
+serifs = "sans"
+noCvSs = true
+noLigation = true
+exportGlyphNames = false
+webfontFormats = ["WOFF2"]
+
+[buildPlans.OpenTUIMono.variants.design]
+one = "no-base"
+two = "straight-neck-serifless"
+three = "flat-top-serifless"
+four = "semi-open-serifless"
+five = "oblique-flat-serifless"
+six = "open-contour"
+seven = "straight-serifless"
+eight = "two-circles"
+nine = "open-contour"
+zero = "dotted"
+capital-a = "straight-serifless"
+capital-b = "standard-serifless"
+capital-c = "bilateral-inward-serifed"
+capital-d = "standard-serifless"
+capital-e = "serifless"
+capital-f = "serifless"
+capital-g = "toothless-corner-inward-serifed-hooked"
+capital-h = "serifless"
+capital-i = "serifed"
+capital-j = "serifless"
+capital-k = "symmetric-touching-serifless"
+capital-l = "serifless"
+capital-m = "hanging-serifless"
+capital-n = "standard-serifless"
+capital-p = "closed-serifless"
+capital-q = "crossing"
+capital-r = "standing-serifless"
+capital-s = "serifless"
+capital-t = "serifless"
+capital-u = "toothless-rounded-serifless"
+capital-v = "straight-serifless"
+capital-w = "straight-flat-top-serifless"
+capital-x = "straight-serifless"
+capital-y = "straight-serifless"
+capital-z = "straight-serifless"
+a = "double-storey-serifless"
+b = "toothed-serifless"
+c = "bilateral-inward-serifed"
+d = "toothed-serifless"
+e = "flat-crossbar"
+f = "flat-hook-serifless-crossbar-at-x-height"
+g = "single-storey-serifless"
+h = "straight-serifless"
+i = "serifed"
+j = "flat-hook-serifed"
+k = "symmetric-touching-serifless"
+l = "serifed"
+m = "serifless"
+n = "straight-serifless"
+p = "eared-serifless"
+q = "straight-serifless"
+r = "hookless-serifless"
+s = "serifless"
+t = "flat-hook-short-neck2"
+u = "toothed-serifless"
+v = "straight-serifless"
+w = "straight-flat-top-serifless"
+x = "straight-serifless"
+y = "straight-serifless"
+z = "straight-serifless"
+lower-theta = "oval"
+tittle = "square"
+diacritic-dot = "square"
+punctuation-dot = "square"
+braille-dot = "square"
+tilde = "low"
+asterisk = "penta-mid"
+underscore = "high"
+caret = "medium"
+ascii-grave = "straight"
+ascii-single-quote = "straight"
+paren = "flat-arc"
+brace = "curly-flat-boundary"
+guillemet = "straight"
+number-sign = "slanted"
+ampersand = "closed"
+at = "fourfold"
+dollar = "through"
+cent = "through-cap"
+percent = "rings-continuous-slash"
+bar = "natural-slope"
+question = "corner"
+pilcrow = "high"
+micro-sign = "toothed-serifless"
+decorative-angle-brackets = "middle"
+lig-ltgteq = "slanted"
+lig-neq = "slightly-slanted"
+lig-equal-chain = "without-notch"
+lig-hyphen-chain = "without-notch"
+lig-plus-chain = "without-notch"
+lig-double-arrow-bar = "without-notch"
+lig-single-arrow-bar = "without-notch"
+
+[buildPlans.OpenTUIMono.weights.Thin]
+shape = 100
+menu = 100
+css = 100
+
+[buildPlans.OpenTUIMono.weights.ExtraLight]
+shape = 200
+menu = 200
+css = 200
+
+[buildPlans.OpenTUIMono.weights.Light]
+shape = 300
+menu = 300
+css = 300
+
+[buildPlans.OpenTUIMono.weights.SemiLight]
+shape = 350
+menu = 350
+css = 350
+
+[buildPlans.OpenTUIMono.weights.Regular]
+shape = 400
+menu = 400
+css = 400
+
+[buildPlans.OpenTUIMono.weights.Medium]
+shape = 500
+menu = 500
+css = 500
+
+[buildPlans.OpenTUIMono.weights.SemiBold]
+shape = 600
+menu = 600
+css = 600
+
+[buildPlans.OpenTUIMono.weights.Bold]
+shape = 700
+menu = 700
+css = 700
+
+[buildPlans.OpenTUIMono.weights.ExtraBold]
+shape = 800
+menu = 800
+css = 800
+
+[buildPlans.OpenTUIMono.weights.Black]
+shape = 900
+menu = 900
+css = 900
+
+[buildPlans.OpenTUIMono.widths.SemiCondensed]
+shape = 540
+menu = 4
+css = "semi-condensed"
+
+[buildPlans.OpenTUIMono.widths.Normal]
+shape = 600
+menu = 5
+css = "normal"
+
+[buildPlans.OpenTUIMono.slopes.Upright]
+angle = 0
+shape = "upright"
+menu = "upright"
+css = "normal"
+
+[buildPlans.OpenTUIMono.slopes.Italic]
+angle = 11.8
+shape = "italic"
+menu = "italic"
+css = "italic"
+
+[buildPlans.OpenTUIMono.subset.include]
+ranges = [
+  [
+    32,
+    126,
+  ],
+  [
+    160,
+    255,
+  ],
+  [
+    256,
+    383,
+  ],
+  [
+    768,
+    879,
+  ],
+  [
+    8192,
+    8303,
+  ],
+  [
+    8352,
+    8383,
+  ],
+  [
+    8592,
+    8703,
+  ],
+  [
+    8704,
+    8959,
+  ],
+  [
+    9472,
+    9599,
+  ],
+  [
+    9600,
+    9631,
+  ],
+  [
+    9632,
+    9727,
+  ],
+]
+
+[buildPlans.OpenTUIMono.metricOverride]
+xHeight = 520
+cap = 690
+ascender = 740
+sb = 85
+
+accentWidth = 182
+accentClearance = 76
+accentHeight = 162
+accentStackOffset = 208
+
+leading = 1250
+parenSize = 860
+dotSize = 'blend(weight, [100, 110], [400, 125], [900, 150])'
+periodSize = 140
+
+essRatio = 1.03
+essRatioUpper = 1.03
+essRatioLower = 1.03
+essRatioQuestion = 1.03
+archDepth = 152
+smallArchDepth = 157
@@ -26,7 +26,7 @@ const { title, description, wide = false, robots } = Astro.props
    <meta name="theme-color" media="(prefers-color-scheme: light)" content="#ffffff" />
    <meta name="theme-color" media="(prefers-color-scheme: dark)" content="#000000" />
    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
-    <link rel="preload" href="/CommitMono-Regular.woff2" as="font" type="font/woff2" crossorigin />
+    <link rel="preload" href="/fonts/OpenTUIMono-Regular.woff2" as="font" type="font/woff2" crossorigin />
    <script is:inline>
      const theme = localStorage.getItem("theme")
      if (theme === "light" || theme === "blue" || theme === "dark") {
@@ -46,32 +46,32 @@ const { title, description, wide = false, robots } = Astro.props

 <style is:global>
  @font-face {
-    font-family: "Commit Mono";
-    src: url("/CommitMono-Regular.woff2") format("woff2");
+    font-family: "OpenTUI Mono";
+    src: url("/fonts/OpenTUIMono-Regular.woff2") format("woff2");
    font-weight: 400;
    font-style: normal;
    font-display: swap;
  }

  @font-face {
-    font-family: "Commit Mono";
-    src: url("/CommitMono-Bold.woff2") format("woff2");
+    font-family: "OpenTUI Mono";
+    src: url("/fonts/OpenTUIMono-Bold.woff2") format("woff2");
    font-weight: 700;
    font-style: normal;
    font-display: swap;
  }

  @font-face {
-    font-family: "Commit Mono";
-    src: url("/CommitMono-Italic.woff2") format("woff2");
+    font-family: "OpenTUI Mono";
+    src: url("/fonts/OpenTUIMono-Italic.woff2") format("woff2");
    font-weight: 400;
    font-style: italic;
    font-display: swap;
  }

  @font-face {
-    font-family: "Commit Mono";
-    src: url("/CommitMono-Bold-Italic.woff2") format("woff2");
+    font-family: "OpenTUI Mono";
+    src: url("/fonts/OpenTUIMono-BoldItalic.woff2") format("woff2");
    font-weight: 700;
    font-style: italic;
    font-display: swap;
@@ -121,7 +121,7 @@ const { title, description, wide = false, robots } = Astro.props
    padding: 4rem var(--page-gutter);
    background: var(--page-background);
    color: var(--page-color);
-    font-family: "Commit Mono", monospace;
+    font-family: "OpenTUI Mono", monospace;
    font-size: var(--text-body);
    line-height: 1.5;
  }
@@ -14,12 +14,13 @@ interface Props {
  reading?: boolean
  footerLinks?: boolean
  footerAnimation?: ComponentProps<typeof SiteFooter>["animation"]
+  robots?: string
 }

-const { title, description, wide = false, reading = false, footerLinks = false, footerAnimation } = Astro.props
+const { title, description, wide = false, reading = false, footerLinks = false, footerAnimation, robots } = Astro.props
 ---

-<Minimal {title} {description} wide>
+<Minimal {title} {description} wide {robots}>
  <SiteNav slot="nav" />
  <main class:list={[{ wide, reading }]}><slot /></main>
  <SiteFooter links={footerLinks} animation={footerAnimation} />
@@ -0,0 +1,265 @@
+---
+import SitePage from "../../layouts/SitePage.astro"
+
+const title = "Font lab | OpenTUI"
+const description = "Compare the live OpenTUI Mono files with the next compile."
+const weight = {
+  regular: "Regular. The outline names the current section.",
+  bold: "Bold. Navigation and the current outline item.",
+  italic: "Italic. Comments in code samples.",
+}
+const prose = [
+  "OpenTUI is a library to build terminal user interfaces in TypeScript, React, or Solid, on a native Zig renderer.",
+  "You write TypeScript directly or through React and Solid. You arrange boxes and text with flexbox. You add selects, inputs, and scroll boxes with keyboard and mouse controls.",
+  "A renderable is a node in the tree. The renderer walks that tree, sets the layout, and writes cells. <code>box</code>, <code>text</code>, and <code>input</code> are renderables. The page typeface sets the article and the code in it.",
+  "Documentation uses 14px. Landing pages, scrollback, and package notes use 16px. Bold marks the current section. Italic marks comments. One family must work for all of this. It must not look like a UI sans on a grid.",
+]
+
+const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ\nabcdefghijklmnopqrstuvwxyz\n0123456789"
+const identity = "Il1|  O0Q  a g  8 69  @  {}[]()  _*#&"
+const operators = "=> === !== <= >= || && ?? ... /* */ <!-- -->"
+const code = `renderer.root.add(
+  box({ flexDirection: "column" }, [
+    text({ content: "rate = tokens / (t1 - t0)" }),
+    input({ placeholder: "filter 1lI O0 {}" }),
+  ]),
+)`
+const boxDrawing = `┌──────────────┬────────┐
+│ renderable   │ state  │
+├──────────────┼────────┤
+│ box          │ ready  │
+│ text         │ dirty  │
+│ input        │ focus  │
+└──────────────┴────────┘`
+---
+
+<SitePage {title} {description} wide robots="noindex">
+  <article class="lab">
+    <h1>Font lab</h1>
+    <p>
+      Live is the typeface on the site in <code>public/fonts/</code>. Next is the next
+      compile in <code>public/fonts/candidate/</code>. The plan is
+      <code>src/font/private-build-plans.toml</code>.
+    </p>
+
+    <h2>Identity</h2>
+    <div class="pair">
+      <figure>
+        <figcaption>Live</figcaption>
+        <pre>{identity}</pre>
+      </figure>
+      <figure class="next">
+        <figcaption>Next</figcaption>
+        <pre>{identity}</pre>
+      </figure>
+    </div>
+
+    <h2>Alphabet</h2>
+    <div class="pair">
+      <figure>
+        <figcaption>Live</figcaption>
+        <pre>{alphabet}</pre>
+      </figure>
+      <figure class="next">
+        <figcaption>Next</figcaption>
+        <pre>{alphabet}</pre>
+      </figure>
+    </div>
+
+    <h2>Code</h2>
+    <div class="pair">
+      <figure>
+        <figcaption>Live</figcaption>
+        <pre>{code}</pre>
+      </figure>
+      <figure class="next">
+        <figcaption>Next</figcaption>
+        <pre>{code}</pre>
+      </figure>
+    </div>
+
+    <h2>Operators</h2>
+    <div class="pair">
+      <figure>
+        <figcaption>Live</figcaption>
+        <pre>{operators}</pre>
+      </figure>
+      <figure class="next">
+        <figcaption>Next</figcaption>
+        <pre>{operators}</pre>
+      </figure>
+    </div>
+
+    <h2>Box drawing</h2>
+    <div class="pair">
+      <figure>
+        <figcaption>Live</figcaption>
+        <pre class="diagram">{boxDrawing}</pre>
+      </figure>
+      <figure class="next">
+        <figcaption>Next</figcaption>
+        <pre class="diagram">{boxDrawing}</pre>
+      </figure>
+    </div>
+
+    <h2>Weight</h2>
+    <div class="pair">
+      <figure>
+        <figcaption>Live</figcaption>
+        <p>{weight.regular}</p>
+        <p class="bold">{weight.bold}</p>
+        <p class="italic">{weight.italic}</p>
+      </figure>
+      <figure class="next">
+        <figcaption>Next</figcaption>
+        <p>{weight.regular}</p>
+        <p class="bold">{weight.bold}</p>
+        <p class="italic">{weight.italic}</p>
+      </figure>
+    </div>
+
+    <h2>Prose</h2>
+    <div class="pair">
+      <figure>
+        <figcaption>Live</figcaption>
+        {prose.map((paragraph) => <p set:html={paragraph} />)}
+      </figure>
+      <figure class="next">
+        <figcaption>Next</figcaption>
+        {prose.map((paragraph) => <p set:html={paragraph} />)}
+      </figure>
+    </div>
+
+    <h2>Reading</h2>
+    <div class="pair reading">
+      <figure>
+        <figcaption>Live</figcaption>
+        {prose.map((paragraph) => <p set:html={paragraph} />)}
+      </figure>
+      <figure class="next">
+        <figcaption>Next</figcaption>
+        {prose.map((paragraph) => <p set:html={paragraph} />)}
+      </figure>
+    </div>
+  </article>
+</SitePage>
+
+<style>
+  @font-face {
+    font-family: "OpenTUI Mono Next";
+    src: url("/fonts/candidate/OpenTUIMono-Regular.woff2") format("woff2");
+    font-weight: 400;
+    font-style: normal;
+    font-display: swap;
+  }
+
+  @font-face {
+    font-family: "OpenTUI Mono Next";
+    src: url("/fonts/candidate/OpenTUIMono-Bold.woff2") format("woff2");
+    font-weight: 700;
+    font-style: normal;
+    font-display: swap;
+  }
+
+  @font-face {
+    font-family: "OpenTUI Mono Next";
+    src: url("/fonts/candidate/OpenTUIMono-Italic.woff2") format("woff2");
+    font-weight: 400;
+    font-style: italic;
+    font-display: swap;
+  }
+
+  @font-face {
+    font-family: "OpenTUI Mono Next";
+    src: url("/fonts/candidate/OpenTUIMono-BoldItalic.woff2") format("woff2");
+    font-weight: 700;
+    font-style: italic;
+    font-display: swap;
+  }
+
+  .lab {
+    max-width: var(--frame-width);
+  }
+
+  .lab h1 {
+    margin-block: 0 3rem;
+  }
+
+  .lab h2 {
+    font-size: 1.25rem;
+    line-height: 1.5rem;
+    margin-block: 3rem 0.75rem;
+  }
+
+  .lab p {
+    max-width: var(--content-width);
+    margin-block: 0 1.5rem;
+  }
+
+  .lab :not(pre) > code {
+    background: color-mix(in srgb, currentColor 8%, transparent);
+    padding: 0.0625rem 0.4ch;
+  }
+
+  .pair {
+    display: grid;
+    gap: 1.5rem;
+    margin-block: 0 1.5rem;
+  }
+
+  .pair figure {
+    margin: 0;
+    min-width: 0;
+  }
+
+  .pair figcaption {
+    color: var(--muted-color);
+    margin-block-end: 0.75rem;
+  }
+
+  .pair pre,
+  .pair p {
+    margin: 0;
+    max-width: none;
+  }
+
+  .pair pre + pre,
+  .pair p + p {
+    margin-block-start: 0.75rem;
+  }
+
+  .pair pre {
+    font-family: inherit;
+    font-size: var(--text-small);
+    white-space: pre-wrap;
+    overflow-wrap: anywhere;
+  }
+
+  .pair .diagram {
+    font-size: inherit;
+    line-height: 1.2;
+    font-variant-ligatures: none;
+    white-space: pre;
+    overflow-x: auto;
+    overflow-wrap: normal;
+  }
+
+  .next {
+    font-family: "OpenTUI Mono Next", monospace;
+  }
+
+  .bold {
+    font-weight: 700;
+  }
+
+  .italic {
+    font-style: italic;
+  }
+
+  @media (min-width: 48rem) {
+    .pair {
+      grid-template-columns: 1fr 1fr;
+      column-gap: 3rem;
+    }
+  }
+</style>
@@ -684,10 +684,10 @@
  }

  function loadAndMount(illustration, config) {
-    // `fitScreenToBox` sizes the screen from a measured glyph width. Measuring
-    // against the fallback monospace font while Commit Mono is still
-    // loading leaves the rendered screen narrower or wider than the box, so
-    // wait for fonts before mounting.
+    // `fitScreenToBox` sizes the screen from a measured glyph width. If you
+    // measure before OpenTUI Mono loads, the fallback monospace font sets
+    // the width. Then the screen is narrower or wider than the box. Wait
+    // for fonts before you mount.
    var fontsReady = document.fonts && document.fonts.ready ? document.fonts.ready : Promise.resolve()
    Promise.all(
      config.stories
@@ -34,7 +34,7 @@
 .terminal-illustration__screen {
  color: inherit;
  flex: none;
-  font-family: "Commit Mono", ui-monospace, monospace;
+  font-family: "OpenTUI Mono", ui-monospace, monospace;
  font-variant-ligatures: none;
  white-space: pre;
 }