diff --git a/src/main/kotlin/nya/kitsunyan/foxydroid/content/Preferences.kt b/src/main/kotlin/nya/kitsunyan/foxydroid/content/Preferences.kt
index 1256617..4588cf4 100644
--- a/src/main/kotlin/nya/kitsunyan/foxydroid/content/Preferences.kt
+++ b/src/main/kotlin/nya/kitsunyan/foxydroid/content/Preferences.kt
@@ -5,6 +5,7 @@ import android.content.SharedPreferences
 import io.reactivex.rxjava3.core.Observable
 import io.reactivex.rxjava3.subjects.PublishSubject
 import nya.kitsunyan.foxydroid.R
+import nya.kitsunyan.foxydroid.entity.ProductItem
 import java.net.Proxy
 
 object Preferences {
@@ -13,7 +14,7 @@ object Preferences {
   private val subject = PublishSubject.create<Key<*>>()
 
   private val keys = sequenceOf(Key.AutoSync, Key.IncompatibleVersions, Key.ProxyHost, Key.ProxyPort, Key.ProxyType,
-    Key.Theme, Key.UpdateNotify, Key.UpdateUnstable).map { Pair(it.name, it) }.toMap()
+    Key.SortOrder, Key.Theme, Key.UpdateNotify, Key.UpdateUnstable).map { Pair(it.name, it) }.toMap()
 
   fun init(context: Context) {
     preferences = context.getSharedPreferences("${context.packageName}_preferences", Context.MODE_PRIVATE)
@@ -77,12 +78,13 @@ object Preferences {
   }
 
   sealed class Key<T>(val name: String, val default: Value<T>) {
+    object AutoSync: Key<Preferences.AutoSync>("auto_sync", Value.EnumerationValue(Preferences.AutoSync.Wifi))
     object IncompatibleVersions: Key<Boolean>("incompatible_versions", Value.BooleanValue(false))
     object ProxyHost: Key<String>("proxy_host", Value.StringValue("localhost"))
     object ProxyPort: Key<Int>("proxy_port", Value.IntValue(9050))
     object ProxyType: Key<Preferences.ProxyType>("proxy_type", Value.EnumerationValue(Preferences.ProxyType.Direct))
+    object SortOrder: Key<Preferences.SortOrder>("sort_order", Value.EnumerationValue(Preferences.SortOrder.Name))
     object Theme: Key<Preferences.Theme>("theme", Value.EnumerationValue(Preferences.Theme.Light))
-    object AutoSync: Key<Preferences.AutoSync>("auto_sync", Value.EnumerationValue(Preferences.AutoSync.Wifi))
     object UpdateNotify: Key<Boolean>("update_notify", Value.BooleanValue(true))
     object UpdateUnstable: Key<Boolean>("update_unstable", Value.BooleanValue(false))
   }
@@ -105,6 +107,15 @@ object Preferences {
     object Socks: ProxyType("socks", Proxy.Type.SOCKS)
   }
 
+  sealed class SortOrder(override val valueString: String, val order: ProductItem.Order): Enumeration<SortOrder> {
+    override val values: List<SortOrder>
+      get() = listOf(Name, Added, Update)
+
+    object Name: SortOrder("name", ProductItem.Order.NAME)
+    object Added: SortOrder("added", ProductItem.Order.DATE_ADDED)
+    object Update: SortOrder("update", ProductItem.Order.LAST_UPDATE)
+  }
+
   sealed class Theme(override val valueString: String, val resId: Int): Enumeration<Theme> {
     override val values: List<Theme>
       get() = listOf(Light, Dark)
diff --git a/src/main/kotlin/nya/kitsunyan/foxydroid/screen/TabsFragment.kt b/src/main/kotlin/nya/kitsunyan/foxydroid/screen/TabsFragment.kt
index 351f98a..4829d71 100644
--- a/src/main/kotlin/nya/kitsunyan/foxydroid/screen/TabsFragment.kt
+++ b/src/main/kotlin/nya/kitsunyan/foxydroid/screen/TabsFragment.kt
@@ -32,8 +32,8 @@ import io.reactivex.rxjava3.core.Observable
 import io.reactivex.rxjava3.disposables.Disposable
 import io.reactivex.rxjava3.schedulers.Schedulers
 import nya.kitsunyan.foxydroid.R
+import nya.kitsunyan.foxydroid.content.Preferences
 import nya.kitsunyan.foxydroid.database.Database
-import nya.kitsunyan.foxydroid.entity.ProductItem
 import nya.kitsunyan.foxydroid.service.Connection
 import nya.kitsunyan.foxydroid.service.SyncService
 import nya.kitsunyan.foxydroid.utility.RxUtils
@@ -52,7 +52,6 @@ class TabsFragment: ScreenFragment() {
     private const val STATE_SHOW_CATEGORIES = "showCategories"
     private const val STATE_CATEGORIES = "categories"
     private const val STATE_CATEGORY = "category"
-    private const val STATE_ORDER = "order"
   }
 
   private class Layout(view: View) {
@@ -87,7 +86,6 @@ class TabsFragment: ScreenFragment() {
   private var searchQuery = ""
   private var categories = emptyList<String>()
   private var category = ""
-  private var order = ProductItem.Order.NAME
 
   private val syncConnection = Connection(SyncService::class.java, onBind = { _, _ ->
     viewPager?.let {
@@ -96,6 +94,7 @@ class TabsFragment: ScreenFragment() {
     }
   })
 
+  private var sortOrderDisposable: Disposable? = null
   private var categoriesDisposable: Disposable? = null
   private var categoriesAnimator: ValueAnimator? = null
 
@@ -152,16 +151,13 @@ class TabsFragment: ScreenFragment() {
         .setIcon(Utils.getToolbarIcon(toolbar.context, R.drawable.ic_sort))
         .let { menu ->
           menu.item.setShowAsActionFlags(MenuItem.SHOW_AS_ACTION_ALWAYS)
-          val items = ProductItem.Order.values().map { order ->
-            menu
-              .add(order.titleResId)
-              .setOnMenuItemClickListener { item ->
-                this@TabsFragment.order = order
-                item.isChecked = true
-                productFragments.forEach { it.setOrder(order) }
+          val items = Preferences.Key.SortOrder.default.value.values
+            .map { sortOrder -> menu
+              .add(sortOrder.order.titleResId)
+              .setOnMenuItemClickListener {
+                Preferences[Preferences.Key.SortOrder] = sortOrder
                 true
-              }
-          }
+              } }
           menu.setGroupCheckable(0, true, true)
           Pair(menu.item, items)
         }
@@ -221,9 +217,12 @@ class TabsFragment: ScreenFragment() {
     category = savedInstanceState?.getString(STATE_CATEGORY).orEmpty()
     layout.categoryChange.setOnClickListener { showCategories = categories.isNotEmpty() && !showCategories }
 
-    order = savedInstanceState?.getString(STATE_ORDER)?.let(ProductItem.Order::valueOf) ?: ProductItem.Order.NAME
-    sortOrderMenu!!.second[order.ordinal].isChecked = true
-    productFragments.forEach { it.setOrder(order) }
+    updateOrder()
+    sortOrderDisposable = Preferences.observable.subscribe {
+      if (it == Preferences.Key.SortOrder) {
+        updateOrder()
+      }
+    }
 
     val content = view.findViewById<FrameLayout>(R.id.fragment_content)!!
 
@@ -303,6 +302,8 @@ class TabsFragment: ScreenFragment() {
     viewPager = null
 
     syncConnection.unbind(requireContext())
+    sortOrderDisposable?.dispose()
+    sortOrderDisposable = null
     categoriesDisposable?.dispose()
     categoriesDisposable = null
     categoriesAnimator?.cancel()
@@ -317,7 +318,6 @@ class TabsFragment: ScreenFragment() {
     outState.putByte(STATE_SHOW_CATEGORIES, if (showCategories) 1 else 0)
     outState.putStringArrayList(STATE_CATEGORIES, ArrayList(categories))
     outState.putString(STATE_CATEGORY, category)
-    outState.putString(STATE_ORDER, order.name)
   }
 
   override fun onViewStateRestored(savedInstanceState: Bundle?) {
@@ -336,7 +336,7 @@ class TabsFragment: ScreenFragment() {
     if (view != null && childFragment is ProductsFragment) {
       childFragment.setSearchQuery(searchQuery)
       childFragment.setCategory(category)
-      childFragment.setOrder(order)
+      childFragment.setOrder(Preferences[Preferences.Key.SortOrder].order)
     }
   }
 
@@ -381,6 +381,12 @@ class TabsFragment: ScreenFragment() {
     syncConnection.binder?.setUpdateNotificationBlocker(blockerFragment)
   }
 
+  private fun updateOrder() {
+    val order = Preferences[Preferences.Key.SortOrder].order
+    sortOrderMenu!!.second[order.ordinal].isChecked = true
+    productFragments.forEach { it.setOrder(order) }
+  }
+
   private fun updateCategory() {
     if (category.isNotEmpty() && categories.indexOf(category) < 0) {
       category = ""