diff --git a/packages/devtools_app/lib/src/screens/app_size/app_size_controller.dart b/packages/devtools_app/lib/src/screens/app_size/app_size_controller.dart
index 17c5b8cb4bc..237fdd156e4 100644
--- a/packages/devtools_app/lib/src/screens/app_size/app_size_controller.dart
+++ b/packages/devtools_app/lib/src/screens/app_size/app_size_controller.dart
@@ -37,7 +37,6 @@ enum DiffTreeType {
       case DiffTreeType.decreaseOnly:
         return 'Decrease Only';
       case DiffTreeType.combined:
-      default:
         return 'Combined';
     }
   }
@@ -55,7 +54,6 @@ enum AppUnit {
       case AppUnit.mainOnly:
         return _mainNodeName;
       case AppUnit.entireApp:
-      default:
         return _entireAppNodeName;
     }
   }
@@ -185,7 +183,6 @@ class AppSizeController {
       case AppUnit.deferredOnly:
         return _deferredDiffTreeMap;
       case AppUnit.entireApp:
-      default:
         return _diffTreeMap;
     }
   }
@@ -205,8 +202,6 @@ class AppSizeController {
         return diffMap.decreaseOnly;
       case DiffTreeType.combined:
         return diffMap.combined;
-      default:
-        return diffMap.combined;
     }
   }
 
@@ -221,7 +216,6 @@ class AppSizeController {
       case AppUnit.mainOnly:
         return _mainOnly;
       case AppUnit.entireApp:
-      default:
         return _entireApp;
     }
   }
diff --git a/packages/devtools_app/lib/src/screens/inspector/layout_explorer/flex/utils.dart b/packages/devtools_app/lib/src/screens/inspector/layout_explorer/flex/utils.dart
index af1b3e8d142..57868d1c6d1 100644
--- a/packages/devtools_app/lib/src/screens/inspector/layout_explorer/flex/utils.dart
+++ b/packages/devtools_app/lib/src/screens/inspector/layout_explorer/flex/utils.dart
@@ -197,7 +197,6 @@ extension AxisExtension on Axis {
       case Axis.horizontal:
         return 'Row';
       case Axis.vertical:
-      default:
         return 'Column';
     }
   }
diff --git a/packages/devtools_app/lib/src/screens/inspector_v2/layout_explorer/flex/utils.dart b/packages/devtools_app/lib/src/screens/inspector_v2/layout_explorer/flex/utils.dart
index 06a7f0d6feb..26792d0166a 100644
--- a/packages/devtools_app/lib/src/screens/inspector_v2/layout_explorer/flex/utils.dart
+++ b/packages/devtools_app/lib/src/screens/inspector_v2/layout_explorer/flex/utils.dart
@@ -197,7 +197,6 @@ extension AxisExtension on Axis {
       case Axis.horizontal:
         return 'Row';
       case Axis.vertical:
-      default:
         return 'Column';
     }
   }
diff --git a/packages/devtools_app/lib/src/shared/charts/chart.dart b/packages/devtools_app/lib/src/shared/charts/chart.dart
index 33884c4d9d5..b0b70697c92 100644
--- a/packages/devtools_app/lib/src/shared/charts/chart.dart
+++ b/packages/devtools_app/lib/src/shared/charts/chart.dart
@@ -698,10 +698,6 @@ class ChartPainter extends CustomPainter {
         );
         canvas.drawPath(path, paintFirst);
         break;
-      default:
-        final message = 'Unknown symbol ${characteristics.symbol}';
-        assert(false, message);
-        _log.shout(message);
     }
   }
 
diff --git a/packages/devtools_app/lib/src/shared/charts/treemap.dart b/packages/devtools_app/lib/src/shared/charts/treemap.dart
index 9789d872496..efdf3ef332c 100644
--- a/packages/devtools_app/lib/src/shared/charts/treemap.dart
+++ b/packages/devtools_app/lib/src/shared/charts/treemap.dart
@@ -123,8 +123,6 @@ class _TreemapState extends State<Treemap> {
           }
         }
         return pivotIndex;
-      default:
-        return -1;
     }
   }
 
diff --git a/packages/devtools_app/lib/src/shared/primitives/utils.dart b/packages/devtools_app/lib/src/shared/primitives/utils.dart
index 3bc7def40c5..1ff4f601e46 100644
--- a/packages/devtools_app/lib/src/shared/primitives/utils.dart
+++ b/packages/devtools_app/lib/src/shared/primitives/utils.dart
@@ -518,7 +518,6 @@ class TimeRange {
       case TimeUnit.microseconds:
         return '[${_start?.inMicroseconds} μs - ${end?.inMicroseconds} μs]';
       case TimeUnit.milliseconds:
-      default:
         return '[${_start?.inMilliseconds} ms - ${end?.inMilliseconds} ms]';
     }
   }
diff --git a/packages/devtools_app/lib/src/shared/table/_table_row.dart b/packages/devtools_app/lib/src/shared/table/_table_row.dart
index 0e7f468ed01..49998db09ab 100644
--- a/packages/devtools_app/lib/src/shared/table/_table_row.dart
+++ b/packages/devtools_app/lib/src/shared/table/_table_row.dart
@@ -365,7 +365,6 @@ class _TableRowState<T> extends State<TableRow<T>>
       case ColumnAlignment.right:
         return Alignment.centerRight;
       case ColumnAlignment.left:
-      default:
         return Alignment.centerLeft;
     }
   }
diff --git a/packages/devtools_app/lib/src/shared/table/table_data.dart b/packages/devtools_app/lib/src/shared/table/table_data.dart
index a669787ec7a..e711a908dcd 100644
--- a/packages/devtools_app/lib/src/shared/table/table_data.dart
+++ b/packages/devtools_app/lib/src/shared/table/table_data.dart
@@ -175,7 +175,6 @@ extension ColumnDataExtension<T> on ColumnData<T> {
       case ColumnAlignment.right:
         return MainAxisAlignment.end;
       case ColumnAlignment.left:
-      default:
         return MainAxisAlignment.start;
     }
   }
@@ -187,7 +186,6 @@ extension ColumnDataExtension<T> on ColumnData<T> {
       case ColumnAlignment.right:
         return TextAlign.right;
       case ColumnAlignment.left:
-      default:
         return TextAlign.left;
     }
   }