diff --git a/data/src/main/java/one/nem/kidshift/data/UserSettings.java b/data/src/main/java/one/nem/kidshift/data/UserSettings.java
index aba7cb4..59bff50 100644
--- a/data/src/main/java/one/nem/kidshift/data/UserSettings.java
+++ b/data/src/main/java/one/nem/kidshift/data/UserSettings.java
@@ -4,9 +4,9 @@ public interface UserSettings {
 
     ApiSetting getApiSetting();
     TaskSetting getTaskSetting();
-    AppCommon getAppCommon();
+    AppCommonSetting getAppCommon();
 
-    interface AppCommon {
+    interface AppCommonSetting {
         boolean isLoggedIn();
         void setLoggedIn(boolean loggedIn);
     }
diff --git a/data/src/main/java/one/nem/kidshift/data/impl/UserSettingsImpl.java b/data/src/main/java/one/nem/kidshift/data/impl/UserSettingsImpl.java
index a3c6726..292b62d 100644
--- a/data/src/main/java/one/nem/kidshift/data/impl/UserSettingsImpl.java
+++ b/data/src/main/java/one/nem/kidshift/data/impl/UserSettingsImpl.java
@@ -30,6 +30,44 @@ public class UserSettingsImpl implements UserSettings {
         return new TaskSettingImpl();
     }
 
+    @Override
+    public AppCommonSetting getAppCommon() {
+        return new AppCommonSettingImpl();
+    }
+
+    public class AppCommonSettingImpl implements UserSettings.AppCommonSetting {
+
+        transient
+        SharedPrefUtils sharedPrefUtils;
+
+        boolean loggedIn;
+
+        AppCommonSettingImpl() {
+            sharedPrefUtils = sharedPrefUtilsFactory.create("user_settings");
+            AppCommonSettingImpl appCommonSetting = sharedPrefUtils.getObject("app_common_setting", AppCommonSettingImpl.class);
+            if (appCommonSetting != null) {
+                loggedIn = appCommonSetting.isLoggedIn();
+            } else {
+                loggedIn = false;
+            }
+        }
+
+        private void save() {
+            sharedPrefUtils.saveObject("app_common_setting", this);
+        }
+
+        @Override
+        public boolean isLoggedIn() {
+            return loggedIn;
+        }
+
+        @Override
+        public void setLoggedIn(boolean loggedIn) {
+            this.loggedIn = loggedIn;
+            save();
+        }
+    }
+
     public class ApiSettingImpl implements UserSettings.ApiSetting {
 
         transient