diff --git a/app/scripts/comp/settings/settings-manager.js b/app/scripts/comp/settings/settings-manager.js
index 64c03031..c17c8d2a 100644
--- a/app/scripts/comp/settings/settings-manager.js
+++ b/app/scripts/comp/settings/settings-manager.js
@@ -11,6 +11,7 @@ const extraThemes = Features.isMac || Features.isiOS ? appleThemes : {};
 const SettingsManager = {
     neutralLocale: null,
     activeLocale: 'en',
+    activeTheme: null,
 
     allLocales: {
         'en': 'English',
@@ -32,9 +33,7 @@ const SettingsManager = {
     customLocales: {},
 
     setBySettings(settings) {
-        if (settings.theme) {
-            this.setTheme(settings.theme);
-        }
+        this.setTheme(settings.theme);
         this.setFontSize(settings.fontSize);
         const locale = settings.locale;
         try {
@@ -46,7 +45,17 @@ const SettingsManager = {
         } catch (ex) {}
     },
 
+    getDefaultTheme() {
+        return Features.isMac ? 'macdark' : 'fb';
+    },
+
     setTheme(theme) {
+        if (!theme) {
+            if (this.activeTheme) {
+                return;
+            }
+            theme = this.getDefaultTheme();
+        }
         for (const cls of document.body.classList) {
             if (/^th-/.test(cls)) {
                 document.body.classList.remove(cls);
@@ -57,6 +66,7 @@ const SettingsManager = {
         if (metaThemeColor) {
             metaThemeColor.content = window.getComputedStyle(document.body).backgroundColor;
         }
+        this.activeTheme = theme;
     },
 
     getThemeClass(theme) {
diff --git a/app/scripts/const/default-app-settings.js b/app/scripts/const/default-app-settings.js
index 43ee5b66..5508267b 100644
--- a/app/scripts/const/default-app-settings.js
+++ b/app/scripts/const/default-app-settings.js
@@ -1,5 +1,5 @@
 const DefaultAppSettings = {
-    theme: 'fb', // UI theme
+    theme: null, // UI theme
     locale: null, // user interface language
     expandGroups: true, // show entries from all subgroups
     listViewWidth: null, // width of the entry list representation
diff --git a/app/scripts/views/settings/settings-general-view.js b/app/scripts/views/settings/settings-general-view.js
index 922002cc..ae2db8b0 100644
--- a/app/scripts/views/settings/settings-general-view.js
+++ b/app/scripts/views/settings/settings-general-view.js
@@ -71,7 +71,7 @@ class SettingsGeneralView extends View {
 
         super.render({
             themes: mapObject(SettingsManager.allThemes, theme => Locale[theme]),
-            activeTheme: AppSettingsModel.theme,
+            activeTheme: SettingsManager.activeTheme,
             locales: SettingsManager.allLocales,
             activeLocale: SettingsManager.activeLocale,
             fontSize: AppSettingsModel.fontSize,
diff --git a/desktop/app.js b/desktop/app.js
index 29a90011..21c175fc 100644
--- a/desktop/app.js
+++ b/desktop/app.js
@@ -188,7 +188,13 @@ function setSystemAppearance() {
     perfTimestamps?.push({ name: 'setting system appearance', ts: process.hrtime() });
 }
 
+function getDefaultTheme() {
+    return process.platform === 'darwin' ? 'macdark' : 'fb';
+}
+
 function createMainWindow() {
+    const theme = appSettings.theme || getDefaultTheme();
+    const bgColor = themeBgColors[theme] || defaultBgColor;
     const windowOptions = {
         show: false,
         width: 1000,
@@ -196,7 +202,7 @@ function createMainWindow() {
         minWidth: 700,
         minHeight: 400,
         titleBarStyle: appSettings.titlebarStyle,
-        backgroundColor: themeBgColors[appSettings.theme] || defaultBgColor,
+        backgroundColor: bgColor,
         webPreferences: {
             backgroundThrottling: false,
             nodeIntegration: true,
diff --git a/release-notes.md b/release-notes.md
index df08cddc..346c57b4 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -6,6 +6,7 @@ Release notes
 `+` #1503: ARM64 Windows support  
 `+` #1480: option to create a portable installation  
 `+` #1400: auto-apply tag when creating new entry in tag view  
+`*` default theme on macOS is now macOS-Dark   
 `+` #1342: hint that the data will be stored in unencrypted form after exporting  
 `*` #1471: WebDAV url validation, only HTTPS is allowed  
 `+` #1350: clearing master password after auto lock period