diff --git a/.github/workflows/core-tests.yml b/.github/workflows/core-tests.yml
index b9263bb7..01bc2764 100644
--- a/.github/workflows/core-tests.yml
+++ b/.github/workflows/core-tests.yml
@@ -1,4 +1,4 @@
-name: VisuStructCore tests
+name: CI
 
 on:
   push:
@@ -17,3 +17,17 @@ jobs:
         run: swift --version
       - name: Build and test
         run: swift test
+
+  app-build:
+    runs-on: macos-15
+    steps:
+      - uses: actions/checkout@v4
+      - name: Xcode version
+        run: xcodebuild -version
+      - name: Build app for iOS Simulator
+        run: |
+          xcodebuild build \
+            -project VisuStruct-iOS/VisuStructXcodeOpen/VisuStruct.xcodeproj \
+            -scheme VisuStruct \
+            -destination 'generic/platform=iOS Simulator' \
+            CODE_SIGNING_ALLOWED=NO
diff --git a/VisuStruct-iOS/VisuStructXcodeOpen/VisuStruct/Canvas/DiagramCanvasView.swift b/VisuStruct-iOS/VisuStructXcodeOpen/VisuStruct/Canvas/DiagramCanvasView.swift
index ec37350b..9d1525d8 100644
--- a/VisuStruct-iOS/VisuStructXcodeOpen/VisuStruct/Canvas/DiagramCanvasView.swift
+++ b/VisuStruct-iOS/VisuStructXcodeOpen/VisuStruct/Canvas/DiagramCanvasView.swift
@@ -267,6 +267,7 @@ struct DiagramCanvasView: View {
                 Color.clear
                     .frame(width: cw, height: ch)
                     .contentShape(Rectangle())
+                    .accessibilityHidden(true)
                     .onTapGesture {
                         selectedPath = nil
                         // iPhone: Einfügemarke durch Tap auf leeren Bereich löschen.
@@ -291,6 +292,8 @@ struct DiagramCanvasView: View {
 
             canvasView(layout: layout, cw: cw, ch: ch)
                 .allowsHitTesting(false)
+                // Gezeichnete Fläche; VoiceOver liest stattdessen die Blöcke darüber.
+                .accessibilityHidden(true)
 
             if let firstRoot = layout.elements.first {
                 rootInsertBeforeFirstStrip(
@@ -298,6 +301,7 @@ struct DiagramCanvasView: View {
                     canvasWidth: cw,
                     canvasHeight: ch
                 )
+                .accessibilityHidden(true)
             }
 
             ForEach(flat, id: \.pathKey) { node in
@@ -408,6 +412,13 @@ struct DiagramCanvasView: View {
         .draggable(DiagramDragPayload(raw: ElementPalette.moveDragIdentifier(path: node.idPath))) {
             nodeDragPreview(for: node)
         }
+        // VoiceOver: ein Element pro Block (statt der unbeschrifteten Drop-Streifen darin).
+        .accessibilityElement(children: .ignore)
+        .accessibilityLabel(accessibilityLabel(for: node))
+        .accessibilityAddTraits(selectedPath == node.idPath ? [.isButton, .isSelected] : .isButton)
+        .accessibilityAction {
+            selectedPath = node.idPath
+        }
         .accessibilityHint(
             isPlaceholderNode
                 ? lang.tr("a11y_placeholder_drop")
@@ -415,6 +426,16 @@ struct DiagramCanvasView: View {
         )
     }
 
+    /// Vorgelesener Name eines Blocks: Elementart und Text, z. B. „Anweisung: int x = 5“.
+    private func accessibilityLabel(for node: VisuStructLayout.Node) -> String {
+        // Schlüssel wie in der Palette: element_anweisung, element_verzweigung, …
+        let kind = lang.tr("element_\(node.element.type)")
+        let text = node.element.textLines
+            .joined(separator: " ")
+            .trimmingCharacters(in: .whitespacesAndNewlines)
+        return text.isEmpty ? kind : "\(kind): \(text)"
+    }
+
     private func copyElement(at path: [Int]) {
         guard let el = try? VisuStructDocumentEditing.element(at: path, in: document) else { return }
         elementClipboard = el