diff --git a/app/src/main/res/values-da/strings.xml b/app/src/main/res/values-da/strings.xml
index 2b598a0..03400c6 100644
--- a/app/src/main/res/values-da/strings.xml
+++ b/app/src/main/res/values-da/strings.xml
@@ -6,6 +6,13 @@
         <item>Bluetooth</item>
         <item>Internal Audio</item>
     </string-array>
+
+    <string-array name="themes_text">
+        <item>@string/system_default</item>
+        <item>Theme White</item>
+        <item>Theme Dark</item>
+    </string-array>
+
     <string name="app_name">Audio Optager</string>
     <string name="auto_close">Auto luk om (%1$d)</string>
     <string name="recording_list_is_empty">Optagelseslisten er tom\n\nKlik Optag for at starte optagelse</string>
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 6a38a48..b7d7868 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Theme Hell</item>
         <item>Theme Dunkel</item>
     </string-array>
diff --git a/app/src/main/res/values-el/strings.xml b/app/src/main/res/values-el/strings.xml
index 5044801..22903d8 100644
--- a/app/src/main/res/values-el/strings.xml
+++ b/app/src/main/res/values-el/strings.xml
@@ -16,6 +16,7 @@
         <item>Internal Audio</item>
     </string-array>
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Φωτεινό</item>
         <item>Σκοτεινό</item>
     </string-array>
diff --git a/app/src/main/res/values-es/strings.xml b/app/src/main/res/values-es/strings.xml
index 11ab498..2436a99 100644
--- a/app/src/main/res/values-es/strings.xml
+++ b/app/src/main/res/values-es/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Tema claro</item>
         <item>Tema oscuro</item>
     </string-array>
diff --git a/app/src/main/res/values-eu/strings.xml b/app/src/main/res/values-eu/strings.xml
index adce86c..941d4ae 100644
--- a/app/src/main/res/values-eu/strings.xml
+++ b/app/src/main/res/values-eu/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Gai zuria</item>
         <item>Gai iluna</item>
     </string-array>
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index 85d62e4..852e594 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Thème Clair</item>
         <item>Thème Sombre</item>
     </string-array>
diff --git a/app/src/main/res/values-in/strings.xml b/app/src/main/res/values-in/strings.xml
index a0aeb3e..1564eef 100644
--- a/app/src/main/res/values-in/strings.xml
+++ b/app/src/main/res/values-in/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Tema Terang</item>
         <item>Tema Gelap</item>
     </string-array>
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index 21dd6fb..a0f3330 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Tema Bianco</item>
         <item>Tema Scuro</item>
     </string-array>
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index 0818aff..a7e2d2f 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>テーマ ホワイト</item>
         <item>テーマ ダーク</item>
     </string-array>
diff --git a/app/src/main/res/values-pl/strings.xml b/app/src/main/res/values-pl/strings.xml
index e09d887..9217d96 100644
--- a/app/src/main/res/values-pl/strings.xml
+++ b/app/src/main/res/values-pl/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Motyw Jasny</item>
         <item>Motyw Ciemny</item>
     </string-array>
diff --git a/app/src/main/res/values-pt-rBR/strings.xml b/app/src/main/res/values-pt-rBR/strings.xml
index cb1b487..e5c29c1 100644
--- a/app/src/main/res/values-pt-rBR/strings.xml
+++ b/app/src/main/res/values-pt-rBR/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Tema claro</item>
         <item>Tema escuro</item>
     </string-array>
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index cf590ef..4ce467f 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -2,6 +2,7 @@
     <string name="app_name">Диктофон</string>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Тема Светлая</item>
         <item>Тема Темная</item>
     </string-array>
diff --git a/app/src/main/res/values-sk/strings.xml b/app/src/main/res/values-sk/strings.xml
index 8982d5d..be41dd4 100644
--- a/app/src/main/res/values-sk/strings.xml
+++ b/app/src/main/res/values-sk/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Svetlý vzhľad</item>
         <item>Tmavý vzhľad</item>
     </string-array>
diff --git a/app/src/main/res/values-tr/strings.xml b/app/src/main/res/values-tr/strings.xml
index bd58eb2..dda05db 100644
--- a/app/src/main/res/values-tr/strings.xml
+++ b/app/src/main/res/values-tr/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Beyaz Tema</item>
         <item>Koyu Tema</item>
     </string-array>
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 156469e..b2fc3be 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>亮色主题</item>
         <item>暗色主题</item>
     </string-array>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index e7bb31a..a027f9b 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>亮色佈景主題</item>
         <item>暗色佈景主題</item>
     </string-array>
diff --git a/app/src/main/res/values/attrs.xml b/app/src/main/res/values/attrs.xml
index 570c35f..17045e9 100644
--- a/app/src/main/res/values/attrs.xml
+++ b/app/src/main/res/values/attrs.xml
@@ -37,6 +37,7 @@
     </string-array>
 
     <string-array name="themes_values" translatable="false">
+        <item>@string/Theme_System</item>
         <item>@string/Theme_Light</item>
         <item>@string/Theme_Dark</item>
     </string-array>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index f52d4bd..cc32ba9 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -19,6 +19,7 @@
     </string-array>
 
     <string-array name="themes_text">
+        <item>@string/system_default</item>
         <item>Theme White</item>
         <item>Theme Dark</item>
     </string-array>
diff --git a/app/src/main/res/xml/pref_general.xml b/app/src/main/res/xml/pref_general.xml
index ea583b2..0d395ea 100644
--- a/app/src/main/res/xml/pref_general.xml
+++ b/app/src/main/res/xml/pref_general.xml
@@ -110,7 +110,7 @@
             android:title="@string/pref_lockscreen_title" />
 
         <ListPreference
-            android:defaultValue="@string/Theme_Light"
+            android:defaultValue="@string/Theme_System"
             android:entries="@array/themes_text"
             android:entryValues="@array/themes_values"
             android:key="theme"