diff --git a/lib/pages/chat/send_file_dialog.dart b/lib/pages/chat/send_file_dialog.dart
index 121c215d6..8d7fcaad0 100644
--- a/lib/pages/chat/send_file_dialog.dart
+++ b/lib/pages/chat/send_file_dialog.dart
@@ -14,6 +14,7 @@ import 'package:fluffychat/utils/localized_exception_extension.dart';
 import 'package:fluffychat/utils/matrix_sdk_extensions/matrix_file_extension.dart';
 import 'package:fluffychat/utils/platform_infos.dart';
 import 'package:fluffychat/utils/size_string.dart';
+import 'package:fluffychat/widgets/adaptive_dialog_action.dart';
 import '../../utils/resize_video.dart';
 
 class SendFileDialog extends StatefulWidget {
@@ -288,14 +289,12 @@ class SendFileDialogState extends State<SendFileDialog> {
           title: Text(sendStr),
           content: contentWidget,
           actions: <Widget>[
-            TextButton(
-              onPressed: () {
-                // just close the dialog
-                Navigator.of(context, rootNavigator: false).pop();
-              },
+            AdaptiveDialogAction(
+              onPressed: () =>
+                  Navigator.of(context, rootNavigator: false).pop(),
               child: Text(L10n.of(context).cancel),
             ),
-            TextButton(
+            AdaptiveDialogAction(
               onPressed: _send,
               child: Text(L10n.of(context).send),
             ),
diff --git a/lib/pages/chat/send_location_dialog.dart b/lib/pages/chat/send_location_dialog.dart
index bb5c9155b..31a311f72 100644
--- a/lib/pages/chat/send_location_dialog.dart
+++ b/lib/pages/chat/send_location_dialog.dart
@@ -8,6 +8,7 @@ import 'package:geolocator/geolocator.dart';
 import 'package:matrix/matrix.dart';
 
 import 'package:fluffychat/pages/chat/events/map_bubble.dart';
+import 'package:fluffychat/widgets/adaptive_dialog_action.dart';
 import 'package:fluffychat/widgets/future_loading_dialog.dart';
 
 class SendLocationDialog extends StatefulWidget {
@@ -114,12 +115,12 @@ class SendLocationDialogState extends State<SendLocationDialog> {
       title: Text(L10n.of(context).shareLocation),
       content: contentWidget,
       actions: [
-        TextButton(
+        AdaptiveDialogAction(
           onPressed: Navigator.of(context, rootNavigator: false).pop,
           child: Text(L10n.of(context).cancel),
         ),
         if (position != null)
-          TextButton(
+          AdaptiveDialogAction(
             onPressed: isSending ? null : sendAction,
             child: Text(L10n.of(context).send),
           ),
diff --git a/lib/pages/chat_details/participant_list_item.dart b/lib/pages/chat_details/participant_list_item.dart
index c77407b91..b71f37310 100644
--- a/lib/pages/chat_details/participant_list_item.dart
+++ b/lib/pages/chat_details/participant_list_item.dart
@@ -1,9 +1,9 @@
-import 'package:fluffychat/config/app_config.dart';
 import 'package:flutter/material.dart';
 
 import 'package:flutter_gen/gen_l10n/l10n.dart';
 import 'package:matrix/matrix.dart';
 
+import 'package:fluffychat/config/app_config.dart';
 import 'package:fluffychat/utils/adaptive_bottom_sheet.dart';
 import '../../widgets/avatar.dart';
 import '../user_bottom_sheet/user_bottom_sheet.dart';
diff --git a/lib/pages/homeserver_picker/homeserver_picker_view.dart b/lib/pages/homeserver_picker/homeserver_picker_view.dart
index 71ca58fd3..4aa4d2929 100644
--- a/lib/pages/homeserver_picker/homeserver_picker_view.dart
+++ b/lib/pages/homeserver_picker/homeserver_picker_view.dart
@@ -5,6 +5,7 @@ import 'package:flutter_linkify/flutter_linkify.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import 'package:fluffychat/config/app_config.dart';
+import 'package:fluffychat/widgets/adaptive_dialog_action.dart';
 import 'package:fluffychat/widgets/layouts/login_scaffold.dart';
 import 'package:fluffychat/widgets/matrix.dart';
 import '../../config/themes.dart';
@@ -107,7 +108,7 @@ class HomeserverPickerView extends StatelessWidget {
                           text: L10n.of(context).homeserverDescription,
                         ),
                         actions: [
-                          TextButton(
+                          AdaptiveDialogAction(
                             onPressed: () => launchUrl(
                               Uri.https('servers.joinmatrix.org'),
                             ),
@@ -115,7 +116,7 @@ class HomeserverPickerView extends StatelessWidget {
                               L10n.of(context).discoverHomeservers,
                             ),
                           ),
-                          TextButton(
+                          AdaptiveDialogAction(
                             onPressed: Navigator.of(context).pop,
                             child: Text(L10n.of(context).close),
                           ),
diff --git a/lib/pages/key_verification/key_verification_dialog.dart b/lib/pages/key_verification/key_verification_dialog.dart
index 2767b18a5..8d195149b 100644
--- a/lib/pages/key_verification/key_verification_dialog.dart
+++ b/lib/pages/key_verification/key_verification_dialog.dart
@@ -9,6 +9,7 @@ import 'package:flutter_gen/gen_l10n/l10n.dart';
 import 'package:matrix/encryption.dart';
 import 'package:matrix/matrix.dart';
 
+import 'package:fluffychat/widgets/adaptive_dialog_action.dart';
 import 'package:fluffychat/widgets/avatar.dart';
 import 'package:fluffychat/widgets/future_loading_dialog.dart';
 
@@ -150,7 +151,7 @@ class KeyVerificationPageState extends State<KeyVerificationDialog> {
           ),
         );
         buttons.add(
-          TextButton(
+          AdaptiveDialogAction(
             child: Text(
               L10n.of(context).submit,
             ),
@@ -158,7 +159,7 @@ class KeyVerificationPageState extends State<KeyVerificationDialog> {
           ),
         );
         buttons.add(
-          TextButton(
+          AdaptiveDialogAction(
             child: Text(
               L10n.of(context).skip,
             ),
@@ -320,7 +321,7 @@ class KeyVerificationPageState extends State<KeyVerificationDialog> {
           ],
         );
         buttons.add(
-          TextButton(
+          AdaptiveDialogAction(
             child: Text(
               L10n.of(context).close,
             ),
@@ -343,7 +344,7 @@ class KeyVerificationPageState extends State<KeyVerificationDialog> {
           ],
         );
         buttons.add(
-          TextButton(
+          AdaptiveDialogAction(
             child: Text(
               L10n.of(context).close,
             ),
diff --git a/lib/utils/error_reporter.dart b/lib/utils/error_reporter.dart
index 28e7b374a..72cfb83a2 100644
--- a/lib/utils/error_reporter.dart
+++ b/lib/utils/error_reporter.dart
@@ -8,6 +8,7 @@ import 'package:matrix/matrix.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import 'package:fluffychat/config/app_config.dart';
+import 'package:fluffychat/widgets/adaptive_dialog_action.dart';
 
 class ErrorReporter {
   final BuildContext context;
@@ -34,17 +35,17 @@ class ErrorReporter {
           ),
         ),
         actions: [
-          TextButton(
+          AdaptiveDialogAction(
             onPressed: () => Navigator.of(context).pop(),
             child: Text(L10n.of(context).close),
           ),
-          TextButton(
+          AdaptiveDialogAction(
             onPressed: () => Clipboard.setData(
               ClipboardData(text: text),
             ),
             child: Text(L10n.of(context).copy),
           ),
-          TextButton(
+          AdaptiveDialogAction(
             onPressed: () => launchUrl(
               AppConfig.newIssueUrl.resolveUri(
                 Uri(
diff --git a/lib/utils/size_string.dart b/lib/utils/size_string.dart
index 930a97f9a..315033076 100644
--- a/lib/utils/size_string.dart
+++ b/lib/utils/size_string.dart
@@ -1,18 +1,21 @@
 extension SizeString on num {
   String get sizeString {
     var size = toDouble();
-    if (size < 1000000) {
+    if (size < 1000) {
+      return '${size.round()} Bytes';
+    }
+    if (size < 1000 * 1000) {
       size = size / 1000;
       size = (size * 10).round() / 10;
       return '${size.toString()} KB';
-    } else if (size < 1000000000) {
+    }
+    if (size < 1000 * 1000 * 1000) {
       size = size / 1000000;
       size = (size * 10).round() / 10;
       return '${size.toString()} MB';
-    } else {
-      size = size / 1000000000;
-      size = (size * 10).round() / 10;
-      return '${size.toString()} GB';
     }
+    size = size / 1000 * 1000 * 1000 * 1000;
+    size = (size * 10).round() / 10;
+    return '${size.toString()} GB';
   }
 }
diff --git a/lib/widgets/adaptive_dialog_action.dart b/lib/widgets/adaptive_dialog_action.dart
new file mode 100644
index 000000000..3df21c33b
--- /dev/null
+++ b/lib/widgets/adaptive_dialog_action.dart
@@ -0,0 +1,28 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+class AdaptiveDialogAction extends StatelessWidget {
+  final VoidCallback? onPressed;
+  final Widget child;
+
+  const AdaptiveDialogAction({
+    super.key,
+    required this.onPressed,
+    required this.child,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    switch (theme.platform) {
+      case TargetPlatform.android:
+      case TargetPlatform.fuchsia:
+      case TargetPlatform.linux:
+      case TargetPlatform.windows:
+        return TextButton(onPressed: onPressed, child: child);
+      case TargetPlatform.iOS:
+      case TargetPlatform.macOS:
+        return CupertinoDialogAction(onPressed: onPressed, child: child);
+    }
+  }
+}
diff --git a/lib/widgets/future_loading_dialog.dart b/lib/widgets/future_loading_dialog.dart
index bd042487f..3df0cf8c0 100644
--- a/lib/widgets/future_loading_dialog.dart
+++ b/lib/widgets/future_loading_dialog.dart
@@ -6,6 +6,7 @@ import 'package:async/async.dart';
 import 'package:flutter_gen/gen_l10n/l10n.dart';
 
 import 'package:fluffychat/utils/localized_exception_extension.dart';
+import 'package:fluffychat/widgets/adaptive_dialog_action.dart';
 
 /// Displays a loading dialog which reacts to the given [future]. The dialog
 /// will be dismissed and the value will be returned when the future completes.
@@ -120,7 +121,7 @@ class LoadingDialogState<T> extends State<LoadingDialog> {
       actions: exception == null
           ? null
           : [
-              TextButton(
+              AdaptiveDialogAction(
                 onPressed: () => Navigator.of(context).pop<Result<T>>(
                   Result.error(
                     exception,