diff --git a/src/core/text-rendering/SdfFontHandler.ts b/src/core/text-rendering/SdfFontHandler.ts
index d938a71..f9f8f96 100644
--- a/src/core/text-rendering/SdfFontHandler.ts
+++ b/src/core/text-rendering/SdfFontHandler.ts
@@ -252,9 +252,10 @@ const processFontData = (
     // normalizeFontMetrics.
   }
 
-  // Same derivation for x-height using glyph 'x' (id 120). Only consumed
-  // when `RendererMainSettings.textBaselineMode === 'x'`; otherwise the
-  // 0.5 × ascender fallback inside `normalizeFontMetrics` is sufficient.
+  // Same derivation for x-height using glyph 'x' (id 120). Consumed by
+  // both `textBaselineMode === 'x'` and `'optical'` (which uses the mean
+  // of cap-height and x-height); the 0.5 × ascender fallback inside
+  // `normalizeFontMetrics` covers fonts that ship without an 'x' glyph.
   if (metrics.xHeight === undefined) {
     const xGlyph = glyphMap.get(120); // 'x'
     if (xGlyph !== undefined) {
diff --git a/src/core/text-rendering/TextLayoutEngine.ts b/src/core/text-rendering/TextLayoutEngine.ts
index 0346b14..d64e15a 100644
--- a/src/core/text-rendering/TextLayoutEngine.ts
+++ b/src/core/text-rendering/TextLayoutEngine.ts
@@ -69,10 +69,10 @@ export const normalizeFontMetrics = (
 /**
  * Engine-wide per-line baseline anchor. Configured once at renderer creation
  * via {@link RendererMainSettings.textBaselineMode}, not exposed per node so
- * a single app can't mix anchor models across its text. Defaults to `'cap'`
- * — see {@link TextBaselineMode} for the rationale.
+ * a single app can't mix anchor models across its text. Defaults to
+ * `'optical'` — see {@link TextBaselineMode} for the rationale.
  */
-let baselineMode: TextBaselineMode = 'cap';
+let baselineMode: TextBaselineMode = 'optical';
 
 /**
  * Sets the engine-wide baseline anchor. Called by `Stage` during construction;
@@ -185,44 +185,51 @@ export const mapTextLayout = (
 
   // line[4] stores the alphabetic baseline Y of each line in screen px.
   //
-  // ── Per-line anchor: cap-height centering ─────────────────────────────
+  // ── Per-line anchor: optical centering (default) ─────────────────────
   //
-  //   baselineY(i) = lineHeight/2 + capHeight/2 + i × lineHeight
+  //   anchor    = (capHeight + xHeight) / 2
+  //   baselineY = lineHeight/2 + anchor/2 + i × lineHeight
   //
-  // The baseline sits below the line's geometric mid-line by exactly
-  // `capHeight / 2`, so the top of an uppercase letter lands the same
-  // distance *above* the mid-line — i.e. capital letters bracket the
-  // center symmetrically. Cap-height centering matches what designers
-  // expect for UI text (button labels, headings, badges): TXYZ and 1234
-  // sit centered; descenders like 'gjpq' hang slightly below, mirroring
-  // CSS button behavior in browsers.
+  // Pure cap-height centering reads slightly low for lowercase-heavy
+  // mixed-case strings like "Button" because the visual mass sits in
+  // the x-height band, below cap-center. Pure x-height centering goes
+  // the other way — caps appear high. Splitting the difference (mean of
+  // cap and x heights) lands at the optical center for the broadest mix
+  // of UI text. This is the same heuristic macOS/iOS controls use.
   //
   // Alternative anchors considered (kept here for the record):
   //
+  //   ── cap-height centering ────────────────────────────────────────────
+  //   baselineY = lineHeight/2 + capHeight/2 + i × lineHeight
+  //   Caps bracket the mid-line symmetrically. Right for all-caps or
+  //   numeric content (timers, badges); reads low for "Button".
+  //
   //   ── x-height centering ──────────────────────────────────────────────
-  //   baselineY(i) = lineHeight/2 + xHeight/2 + i × lineHeight
-  //   Centers lowercase letters on the mid-line. Matches CSS inline
-  //   `vertical-align: middle`. Reads well for running body text but
-  //   capitals appear high in headings/labels — wrong default for TV UI.
+  //   baselineY = lineHeight/2 + xHeight/2 + i × lineHeight
+  //   Centers lowercase. Matches CSS inline `vertical-align: middle`.
+  //   Reads well for body text; capitals appear high in headings.
   //
   //   ── line-box centering (pre-cap-height behavior) ───────────────────
   //   const halfLeading = (lineHeightPx − bareLineHeight) / 2
-  //   baselineY(i) = halfLeading + ascender + i × lineHeight
-  //   Centers the abstract asc-to-desc-plus-leading rectangle. The visible
-  //   ink lands noticeably high because asc/(asc−desc) is asymmetric for
-  //   most Latin fonts (~4.2:1 for Ubuntu). Mathematically tidy, visually
-  //   wrong.
+  //   baselineY = halfLeading + ascender + i × lineHeight
+  //   Centers the abstract asc-to-desc-plus-leading rectangle. Ink lands
+  //   noticeably high because asc/(asc−desc) is asymmetric for most
+  //   Latin fonts (~4.2:1 for Ubuntu). Mathematically tidy, visually wrong.
   //
   // The active anchor is configured at renderer creation via
-  // `RendererMainSettings.textBaselineMode`. Defaults to `'cap'`.
+  // `RendererMainSettings.textBaselineMode`. Defaults to `'optical'`.
   let firstBaselineY: number;
-  if (baselineMode === 'x') {
+  if (baselineMode === 'cap') {
+    firstBaselineY = (lineHeightPx + metrics.capHeight) * 0.5;
+  } else if (baselineMode === 'x') {
     firstBaselineY = (lineHeightPx + metrics.xHeight) * 0.5;
   } else if (baselineMode === 'linebox') {
     const halfLeading = (lineHeightPx - bareLineHeight) * 0.5;
     firstBaselineY = halfLeading + metrics.ascender;
   } else {
-    firstBaselineY = (lineHeightPx + metrics.capHeight) * 0.5;
+    // 'optical' — mean of cap-height and x-height
+    const opticalAnchor = (metrics.capHeight + metrics.xHeight) * 0.5;
+    firstBaselineY = (lineHeightPx + opticalAnchor) * 0.5;
   }
   for (let i = 0; i < effectiveLineAmount; i++) {
     const line = lines[i] as TextLineStruct;
diff --git a/src/core/text-rendering/TextRenderer.ts b/src/core/text-rendering/TextRenderer.ts
index bb591d2..7c3337b 100644
--- a/src/core/text-rendering/TextRenderer.ts
+++ b/src/core/text-rendering/TextRenderer.ts
@@ -21,17 +21,20 @@ export type TextRenderers = 'canvas' | 'sdf';
  * cannot be overridden per node — see the engine-wide reasoning in
  * `TextLayoutEngine.mapTextLayout`.
  *
- * - `'cap'` (default): capital letters centered. Best for UI text — button
- *   labels, headings, badges. Capitals and digits bracket the center
- *   symmetrically; descenders hang slightly below, matching CSS button
- *   behavior in browsers.
- * - `'x'`: lowercase x-height centered. Better for running body text;
+ * - `'optical'` (default): the midpoint of cap-height and x-height is
+ *   centered. Looks visually centered for mixed-case text — the
+ *   sweet spot between `'cap'` (which can read low for lowercase-heavy
+ *   strings) and `'x'` (which can read high for headings).
+ * - `'cap'`: capital letters centered. Use when content is mostly
+ *   uppercase or numeric (badges, timers). Mixed-case strings like
+ *   "Button" may read slightly low.
+ * - `'x'`: lowercase x-height centered. Best for running body text;
  *   capitals appear slightly high in headings.
  * - `'linebox'`: legacy. Centers the abstract asc-to-desc-plus-leading
  *   rectangle. Mathematically tidy but visually unbalanced because most
  *   Latin fonts have asymmetric asc/desc ratios.
  */
-export type TextBaselineMode = 'cap' | 'x' | 'linebox';
+export type TextBaselineMode = 'optical' | 'cap' | 'x' | 'linebox';
 /**
  * Structure mapping font family names to a set of font faces.
  */
diff --git a/src/main-api/Renderer.ts b/src/main-api/Renderer.ts
index cedec0b..a90d9b3 100644
--- a/src/main-api/Renderer.ts
+++ b/src/main-api/Renderer.ts
@@ -374,17 +374,20 @@ export type RendererMainSettings = RendererRuntimeSettings & {
    * mid-line. This is engine-wide and intentionally not exposed per node —
    * mixing anchor models within one app produces visually inconsistent text.
    *
-   * - `'cap'` (default): capital letters and digits sit centered on the line.
-   *   Best fit for UI text (button labels, headings, badges); descenders on
-   *   words like 'gjpq' hang slightly below center, matching CSS button
-   *   behavior in browsers.
+   * - `'optical'` (default): the mean of cap-height and x-height is centered.
+   *   Reads visually centered for mixed-case UI text like "Button"; the
+   *   sweet spot between `'cap'` (low for lowercase-heavy) and `'x'` (high
+   *   for headings). Matches macOS/iOS control behavior.
+   * - `'cap'`: capital letters and digits sit centered on the line. Use
+   *   when content is mostly uppercase or numeric (timers, badges); mixed-
+   *   case "Button" can read slightly low.
    * - `'x'`: lowercase x-height is centered. Better for running body text;
    *   capitals appear slightly high in headings.
    * - `'linebox'`: legacy mode. Centers the asc/lineGap/desc rectangle.
    *   Mathematically tidy but visually unbalanced because most Latin fonts
    *   have asymmetric asc/desc ratios.
    *
-   * @defaultValue `'cap'`
+   * @defaultValue `'optical'`
    */
   textBaselineMode: TextBaselineMode;
 
@@ -555,7 +558,7 @@ export class RendererMain extends EventEmitter {
       renderEngine: settings.renderEngine,
       quadBufferSize: settings.quadBufferSize ?? 4 * 1024 * 1024,
       fontEngines: settings.fontEngines ?? [],
-      textBaselineMode: settings.textBaselineMode ?? 'cap',
+      textBaselineMode: settings.textBaselineMode ?? 'optical',
       textureProcessingTimeLimit: settings.textureProcessingTimeLimit || 10,
       canvas: settings.canvas,
       createImageBitmapSupport: settings.createImageBitmapSupport || 'full',
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