diff --git a/crates/gpui_macos/src/shaders.metal b/crates/gpui_macos/src/shaders.metal
index 3c6adac3359ac41ee0cc265480dae6e63a2c2136..4dc2d334e1e0929cc2ee7369ecce2f074b919366 100644
--- a/crates/gpui_macos/src/shaders.metal
+++ b/crates/gpui_macos/src/shaders.metal
@@ -1215,6 +1215,20 @@ float4 fill_color(Background background,
           break;
         }
       }
+
+      // Dither to reduce banding in gradients (especially dark/alpha).
+      // Triangular-distributed noise breaks up 8-bit quantization steps.
+      // ±2/255 for RGB (enough for dark-on-dark compositing),
+      // ±3/255 for alpha (needs more because alpha × dark color = tiny steps).
+      {
+        float2 seed = position * 0.6180339887; // golden ratio spread
+        float r1 = fract(sin(dot(seed, float2(12.9898, 78.233))) * 43758.5453);
+        float r2 = fract(sin(dot(seed, float2(39.3460, 11.135))) * 24634.6345);
+        float tri = r1 + r2 - 1.0; // triangular PDF, range [-1, +1]
+        color.rgb += tri * 2.0 / 255.0;
+        color.a   += tri * 3.0 / 255.0;
+      }
+
       break;
     }
     case 2: {
diff --git a/crates/gpui_windows/src/shaders.hlsl b/crates/gpui_windows/src/shaders.hlsl
index f508387daf9c98ffcce521209d2c981cf04db983..646cfd61cc37c31fade09d427c6d7c8f87519fa6 100644
--- a/crates/gpui_windows/src/shaders.hlsl
+++ b/crates/gpui_windows/src/shaders.hlsl
@@ -384,6 +384,20 @@ float4 gradient_color(Background background,
                     break;
                 }
             }
+
+            // Dither to reduce banding in gradients (especially dark/alpha).
+            // Triangular-distributed noise breaks up 8-bit quantization steps.
+            // ±2/255 for RGB (enough for dark-on-dark compositing),
+            // ±3/255 for alpha (needs more because alpha × dark color = tiny steps).
+            {
+                float2 seed = position * 0.6180339887; // golden ratio spread
+                float r1 = frac(sin(dot(seed, float2(12.9898, 78.233))) * 43758.5453);
+                float r2 = frac(sin(dot(seed, float2(39.3460, 11.135))) * 24634.6345);
+                float tri = r1 + r2 - 1.0; // triangular PDF, range [-1, +1]
+                color.rgb += tri * 2.0 / 255.0;
+                color.a   += tri * 3.0 / 255.0;
+            }
+
             break;
         }
         case 2: {