diff --git a/lib/src/flow_editor_page.dart b/lib/src/flow_editor_page.dart
index 7a5d264..6e1167f 100644
--- a/lib/src/flow_editor_page.dart
+++ b/lib/src/flow_editor_page.dart
@@ -49,7 +49,7 @@ String _defaultFlowsDir() {
       Platform.environment['HOME'] ??
       Platform.environment['USERPROFILE'] ??
       '.';
-  return '$home/.fai/data/flows';
+  return '$home/.chain/data/flows';
 }
 
 class FlowEditorPage extends StatefulWidget {
diff --git a/lib/src/model/layout_store.dart b/lib/src/model/layout_store.dart
index a9067e5..a80964d 100644
--- a/lib/src/model/layout_store.dart
+++ b/lib/src/model/layout_store.dart
@@ -18,7 +18,7 @@
 //
 // Storage layout:
 //
-//   ~/.fai/data/flows/.layout/<flow-name>.json
+//   ~/.chain/data/flows/.layout/<flow-name>.json
 //
 // One file per flow. JSON shape:
 //
@@ -93,7 +93,7 @@ class NodePosition {
 /// graph view loads / saves them at well-defined moments
 /// (open file, drag end), not in the render loop.
 class LayoutStore {
-  /// Directory `~/.fai/data/flows/.layout/`, created on first
+  /// Directory `~/.chain/data/flows/.layout/`, created on first
   /// write. Hidden so it doesn't show up in `fai admin
   /// flows list` style enumerations.
   static String defaultDir() {
@@ -101,7 +101,7 @@ class LayoutStore {
         Platform.environment['HOME'] ??
         Platform.environment['USERPROFILE'] ??
         '.';
-    return '$home/.fai/data/flows/.layout';
+    return '$home/.chain/data/flows/.layout';
   }
 
   /// Load the layout for [flowName]. Returns an empty layout
diff --git a/lib/src/widgets/run_tab.dart b/lib/src/widgets/run_tab.dart
index 69f65ba..5fa692d 100644
--- a/lib/src/widgets/run_tab.dart
+++ b/lib/src/widgets/run_tab.dart
@@ -15,7 +15,7 @@
 //   4. The flow's outputs once the run resolves.
 //
 // The tab requires the file to be saved on disk — the hub's
-// runSavedFlow reads from `~/.fai/data/flows/<name>.yaml`,
+// runSavedFlow reads from `~/.chain/data/flows/<name>.yaml`,
 // not from the in-memory buffer. The dirty banner reminds
 // the operator to save before running so they don't run a
 // stale version by surprise.