diff --git a/ui/test/disk-health-contrast.test.mjs b/ui/test/disk-health-contrast.test.mjs
new file mode 100644
index 00000000..08978e7b
--- /dev/null
+++ b/ui/test/disk-health-contrast.test.mjs
@@ -0,0 +1,37 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+
+const page = fs.readFileSync(new URL('../widgets/disk-health/index.html', import.meta.url), 'utf8');
+
+const luminance = rgb =>
+  rgb
+    .map(v => v / 255)
+    .map(v => (v <= 0.04045 ? v / 12.92 : ((v + 0.055) / 1.055) ** 2.4))
+    .reduce((sum, v, i) => sum + v * [0.2126, 0.7152, 0.0722][i], 0);
+const hex = h => [1, 3, 5].map(i => parseInt(h.slice(i, i + 2), 16));
+const ratio = (alpha, bg) => {
+  const fg = bg.map(v => 255 * alpha + v * (1 - alpha));
+  return (luminance(fg) + 0.05) / (luminance(bg) + 0.05);
+};
+
+const rule = selector => {
+  const at = page.indexOf(`\n  ${selector} {`);
+  assert.ok(at >= 0, `${selector} moved`);
+  return page.slice(at, page.indexOf('}', at));
+};
+const ink = selector => Number(/color:rgba\(255,255,255,([\d.]+)\)/.exec(rule(selector))?.[1]);
+const fill = selector => hex(/background(?:-color)?:(#[0-9A-Fa-f]{6})/.exec(rule(selector))?.[1] ?? '');
+
+/* SC 1.4.3: 11px text needs 4.5:1. */
+for (const [text, on, bg] of [
+  ['bay name', '.bay-name', '.bay'],
+  ['bay name on a pressed bay', '.bay-name', '.bay.assigned:hover,\n  .bay.assigned.touch-active'],
+  ['unread bay name', '.bay.unread .bay-name', '.bay.unread'],
+  ['bay number', '#nums span', '#panel'],
+]) {
+  test(`the ${text} clears 4.5:1`, () => {
+    const r = ratio(ink(on), fill(bg));
+    assert.ok(r >= 4.5, `${text} reads at ${r.toFixed(2)}:1`);
+  });
+}
diff --git a/ui/widgets/disk-health/index.html b/ui/widgets/disk-health/index.html
index 4a28dc01..2fc4488e 100644
--- a/ui/widgets/disk-health/index.html
+++ b/ui/widgets/disk-health/index.html
@@ -54,7 +54,7 @@
   }
   .bay.empty { background-color:#2C2C2E; }
   .bay.unread { background-color:#2C2C2E; box-shadow: inset 0 0 0 1.5px rgba(255,255,255,0.22); }
-  .bay.unread .bay-name { color:rgba(255,255,255,0.28); }
+  .bay.unread .bay-name { color:rgba(255,255,255,0.5); }
   .bay.assigned { cursor:pointer; }
   #root.size-medium .bay { border-width:1px; border-radius:8px; }
   .bay.assigned:hover,
@@ -71,7 +71,7 @@
     display:flex; align-items:center; justify-content:center;
     writing-mode:vertical-rl;
     font-size:11px; font-weight:500; letter-spacing:0.08em;
-    color:rgba(255,255,255,0.34);
+    color:rgba(255,255,255,0.62);
     white-space:nowrap; overflow:hidden; pointer-events:none;
   }
   .led {
@@ -84,7 +84,7 @@
   .led.unread { background:transparent; box-shadow: inset 0 0 0 1.5px #8E8E93; }
 
   #nums { height:16px; flex-shrink:0; display:flex; align-items:center; padding:3px 4px 0; }
-  #nums span { flex:1; text-align:center; font-size:11px; font-weight:500; color:rgba(255,255,255,0.4); }
+  #nums span { flex:1; text-align:center; font-size:11px; font-weight:500; color:rgba(255,255,255,0.5); }
   #alert { display:flex; align-items:center; gap:5px; padding:5px 2px 0; font-size:11px; font-weight:600;
     line-height:1.2; color:rgba(255,255,255,0.92); }
   #alert::before { content:''; width:6px; height:6px; border-radius:50%; flex-shrink:0; background:#FF4245; }