diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/preferences/PreferencesRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/preferences/PreferencesRepository.kt
index bb9a39b1..e1caf920 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/preferences/PreferencesRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/preferences/PreferencesRepository.kt
@@ -12,52 +12,60 @@ class PreferencesRepository @Inject constructor(
     val context: Context
 ) {
     val startMenuIndex: Int
-        get() = sharedPref.getString(context.getString(R.string.pref_key_start_menu), "0")?.toIntOrNull() ?: 0
+        get() = getString(R.string.pref_key_start_menu, R.string.pref_default_startup).toInt()
 
     val isShowPresent: Boolean
-        get() = sharedPref.getBoolean(context.getString(R.string.pref_key_attendance_present), true)
+        get() = getBoolean(R.string.pref_key_attendance_present, R.bool.pref_default_attendance_present)
 
     val gradeAverageMode: String
-        get() = sharedPref.getString(context.getString(R.string.pref_key_grade_average_mode), "only_one_semester") ?: "only_one_semester"
+        get() = getString(R.string.pref_key_grade_average_mode, R.string.pref_default_grade_average_mode)
 
     val gradeAverageForceCalc: Boolean
-        get() = sharedPref.getBoolean(context.getString(R.string.pref_key_grade_average_force_calc), false)
+        get() = getBoolean(R.string.pref_key_grade_average_force_calc, R.bool.pref_default_grade_average_force_calc)
 
     val isGradeExpandable: Boolean
-        get() = !sharedPref.getBoolean(context.getString(R.string.pref_key_expand_grade), false)
+        get() = !getBoolean(R.string.pref_key_expand_grade, R.bool.pref_default_expand_grade)
 
-    val appThemeKey: String = context.getString(R.string.pref_key_app_theme)
+    val appThemeKey = context.getString(R.string.pref_key_app_theme)
     val appTheme: String
-        get() = sharedPref.getString(appThemeKey, "light") ?: "light"
+        get() = getString(appThemeKey, R.string.pref_default_app_theme)
 
     val gradeColorTheme: String
-        get() = sharedPref.getString(context.getString(R.string.pref_key_grade_color_scheme), "vulcan") ?: "vulcan"
+        get() = getString(R.string.pref_key_grade_color_scheme, R.string.pref_default_grade_color_scheme)
 
-    val serviceEnableKey: String = context.getString(R.string.pref_key_services_enable)
+    val serviceEnableKey = context.getString(R.string.pref_key_services_enable)
     val isServiceEnabled: Boolean
-        get() = sharedPref.getBoolean(serviceEnableKey, true)
+        get() = getBoolean(serviceEnableKey, R.bool.pref_default_services_enable)
 
-    val servicesIntervalKey: String = context.getString(R.string.pref_key_services_interval)
+    val servicesIntervalKey = context.getString(R.string.pref_key_services_interval)
     val servicesInterval: Long
-        get() = sharedPref.getString(servicesIntervalKey, "60")?.toLongOrNull() ?: 60
+        get() = getString(servicesIntervalKey, R.string.pref_default_services_interval).toLong()
 
-    val servicesOnlyWifiKey: String = context.getString(R.string.pref_key_services_wifi_only)
+    val servicesOnlyWifiKey = context.getString(R.string.pref_key_services_wifi_only)
     val isServicesOnlyWifi: Boolean
-        get() = sharedPref.getBoolean(servicesOnlyWifiKey, false)
+        get() = getBoolean(servicesOnlyWifiKey, R.bool.pref_default_services_wifi_only)
 
     val isNotificationsEnable: Boolean
-        get() = sharedPref.getBoolean(context.getString(R.string.pref_key_notifications_enable), true)
+        get() = getBoolean(R.string.pref_key_notifications_enable, R.bool.pref_default_notifications_enable)
 
-    val isDebugNotificationEnableKey: String = context.getString(R.string.pref_key_notification_debug)
+    val isDebugNotificationEnableKey = context.getString(R.string.pref_key_notification_debug)
     val isDebugNotificationEnable: Boolean
-        get() = sharedPref.getBoolean(isDebugNotificationEnableKey, false)
+        get() = getBoolean(isDebugNotificationEnableKey, R.bool.pref_default_notification_debug)
 
     val gradePlusModifier: Double
-        get() = sharedPref.getString(context.getString(R.string.pref_key_grade_modifier_plus), "0.0")?.toDouble() ?: 0.0
+        get() = getString(R.string.pref_key_grade_modifier_plus, R.string.pref_default_grade_modifier_plus).toDouble()
 
     val gradeMinusModifier: Double
-        get() = sharedPref.getString(context.getString(R.string.pref_key_grade_modifier_minus), "0.0")?.toDouble() ?: 0.0
+        get() = getString(R.string.pref_key_grade_modifier_minus, R.string.pref_default_grade_modifier_minus).toDouble()
 
     val fillMessageContent: Boolean
-        get() = sharedPref.getBoolean(context.getString(R.string.pref_key_fill_message_content), true)
+        get() = getBoolean(R.string.pref_key_fill_message_content, R.bool.pref_default_fill_message_content)
+
+    private fun getString(id: Int, default: Int) = getString(context.getString(id), default)
+
+    private fun getString(id: String, default: Int) = sharedPref.getString(id, context.getString(default)) ?: context.getString(default)
+
+    private fun getBoolean(id: Int, default: Int) = getBoolean(context.getString(id), default)
+
+    private fun getBoolean(id: String, default: Int) = sharedPref.getBoolean(id, context.resources.getBoolean(default))
 }
diff --git a/app/src/main/res/values-pl/value_prefernces.xml b/app/src/main/res/values-pl/preferences_values.xml
similarity index 100%
rename from app/src/main/res/values-pl/value_prefernces.xml
rename to app/src/main/res/values-pl/preferences_values.xml
diff --git a/app/src/main/res/values/preferences_defaults.xml b/app/src/main/res/values/preferences_defaults.xml
new file mode 100644
index 00000000..53b5c2ab
--- /dev/null
+++ b/app/src/main/res/values/preferences_defaults.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:tools="http://schemas.android.com/tools" tools:ignore="MissingTranslation">
+    <string name="pref_default_startup">0</string>
+    <bool name="pref_default_attendance_present">true</bool>
+    <string name="pref_default_grade_average_mode">only_one_semester</string>
+    <bool name="pref_default_grade_average_force_calc">false</bool>
+    <bool name="pref_default_expand_grade">false</bool>
+    <string name="pref_default_app_theme">light</string>
+    <string name="pref_default_grade_color_scheme">vulcan</string>
+    <bool name="pref_default_services_enable">true</bool>
+    <string name="pref_default_services_interval">60</string>
+    <bool name="pref_default_services_wifi_only">false</bool>
+    <bool name="pref_default_notifications_enable">true</bool>
+    <bool name="pref_default_notification_debug">false</bool>
+    <string name="pref_default_grade_modifier_plus">0.0</string>
+    <string name="pref_default_grade_modifier_minus">0.0</string>
+    <bool name="pref_default_fill_message_content">true</bool>
+</resources>
diff --git a/app/src/main/res/values/value_prefernces.xml b/app/src/main/res/values/preferences_values.xml
similarity index 100%
rename from app/src/main/res/values/value_prefernces.xml
rename to app/src/main/res/values/preferences_values.xml
diff --git a/app/src/main/res/xml/scheme_preferences.xml b/app/src/main/res/xml/scheme_preferences.xml
index d762066a..28229f41 100644
--- a/app/src/main/res/xml/scheme_preferences.xml
+++ b/app/src/main/res/xml/scheme_preferences.xml
@@ -4,7 +4,7 @@
         app:iconSpaceReserved="false"
         app:title="@string/pref_view_header">
         <ListPreference
-            app:defaultValue="0"
+            app:defaultValue="@string/pref_default_startup"
             app:entries="@array/startup_tab_entries"
             app:entryValues="@array/startup_tab_value"
             app:iconSpaceReserved="false"
@@ -12,7 +12,7 @@
             app:title="@string/pref_view_list"
             app:useSimpleSummaryProvider="true" />
         <ListPreference
-            app:defaultValue="light"
+            app:defaultValue="@string/pref_default_app_theme"
             app:entries="@array/app_theme_entries"
             app:entryValues="@array/app_theme_values"
             app:iconSpaceReserved="false"
@@ -20,17 +20,17 @@
             app:title="@string/pref_view_app_theme"
             app:useSimpleSummaryProvider="true" />
         <SwitchPreferenceCompat
-            app:defaultValue="true"
+            app:defaultValue="@bool/pref_default_attendance_present"
             app:iconSpaceReserved="false"
             app:key="@string/pref_key_attendance_present"
             app:title="@string/pref_view_present" />
         <SwitchPreferenceCompat
-            app:defaultValue="false"
+            app:defaultValue="@bool/pref_default_expand_grade"
             app:iconSpaceReserved="false"
             app:key="@string/pref_key_expand_grade"
             app:title="@string/pref_view_expand_grade" />
         <ListPreference
-            app:defaultValue="vulcan"
+            app:defaultValue="@string/pref_default_grade_color_scheme"
             app:entries="@array/grade_color_scheme_entries"
             app:entryValues="@array/grade_color_scheme_values"
             app:iconSpaceReserved="false"
@@ -42,12 +42,12 @@
         app:iconSpaceReserved="false"
         app:title="@string/pref_services_header">
         <SwitchPreferenceCompat
-            app:defaultValue="true"
+            app:defaultValue="@bool/pref_default_services_enable"
             app:iconSpaceReserved="false"
             app:key="@string/pref_key_services_enable"
             app:title="@string/pref_services_switch" />
         <ListPreference
-            app:defaultValue="60"
+            app:defaultValue="@string/pref_default_services_interval"
             app:dependency="services_enable"
             app:entries="@array/services_interval_entries"
             app:entryValues="@array/services_interval_value"
@@ -56,7 +56,7 @@
             app:title="@string/pref_services_interval"
             app:useSimpleSummaryProvider="true" />
         <SwitchPreferenceCompat
-            app:defaultValue="false"
+            app:defaultValue="@bool/pref_default_services_wifi_only"
             app:dependency="services_enable"
             app:iconSpaceReserved="false"
             app:key="@string/pref_key_services_wifi_only"
@@ -66,13 +66,13 @@
         app:iconSpaceReserved="false"
         app:title="@string/pref_notify_header">
         <SwitchPreferenceCompat
-            app:defaultValue="true"
+            app:defaultValue="@bool/pref_default_notifications_enable"
             app:dependency="services_enable"
             app:iconSpaceReserved="false"
             app:key="@string/pref_key_notifications_enable"
             app:title="@string/pref_notify_switch" />
         <SwitchPreferenceCompat
-            app:defaultValue="false"
+            app:defaultValue="@bool/pref_default_notification_debug"
             app:iconSpaceReserved="false"
             app:key="@string/pref_key_notification_debug"
             app:title="@string/pref_notify_debug_switch" />
@@ -81,7 +81,7 @@
         app:iconSpaceReserved="false"
         app:title="@string/pref_other_header">
         <ListPreference
-            app:defaultValue="0.0"
+            app:defaultValue="@string/pref_default_grade_modifier_plus"
             app:entries="@array/grade_modifier_entries"
             app:entryValues="@array/grade_modifier_value"
             app:iconSpaceReserved="false"
@@ -89,7 +89,7 @@
             app:title="@string/pref_other_grade_modifier_plus"
             app:useSimpleSummaryProvider="true" />
         <ListPreference
-            app:defaultValue="0.0"
+            app:defaultValue="@string/pref_default_grade_modifier_minus"
             app:entries="@array/grade_modifier_entries"
             app:entryValues="@array/grade_modifier_value"
             app:iconSpaceReserved="false"
@@ -97,7 +97,7 @@
             app:title="@string/pref_other_grade_modifier_minus"
             app:useSimpleSummaryProvider="true" />
         <ListPreference
-            app:defaultValue="only_one_semester"
+            app:defaultValue="@string/pref_default_grade_average_mode"
             app:entries="@array/grade_average_mode_entries"
             app:entryValues="@array/grade_average_mode_values"
             app:iconSpaceReserved="false"
@@ -105,12 +105,12 @@
             app:title="@string/pref_view_grade_average_mode"
             app:useSimpleSummaryProvider="true" />
         <SwitchPreferenceCompat
-            app:defaultValue="false"
+            app:defaultValue="@bool/pref_default_grade_average_force_calc"
             app:key="@string/pref_key_grade_average_force_calc"
             app:title="@string/pref_view_grade_average_force_calc"
             app:iconSpaceReserved="false" />
         <SwitchPreferenceCompat
-            app:defaultValue="true"
+            app:defaultValue="@bool/pref_default_fill_message_content"
             app:iconSpaceReserved="false"
             app:key="@string/pref_key_fill_message_content"
             app:title="@string/pref_other_fill_message_content" />