diff --git a/Signal/src/ViewControllers/ConversationView/ConversationInputToolbar.m b/Signal/src/ViewControllers/ConversationView/ConversationInputToolbar.m
index ed33a4f63..e8cd6c38e 100644
--- a/Signal/src/ViewControllers/ConversationView/ConversationInputToolbar.m
+++ b/Signal/src/ViewControllers/ConversationView/ConversationInputToolbar.m
@@ -92,8 +92,7 @@ const CGFloat kMaxTextViewHeight = 98;
         CGFloat alpha = OWSNavigationBar.backgroundBlurMutingFactor;
         self.backgroundColor = [Theme.toolbarBackgroundColor colorWithAlphaComponent:alpha];
 
-        UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
-        UIVisualEffectView *blurEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
+        UIVisualEffectView *blurEffectView = [[UIVisualEffectView alloc] initWithEffect:Theme.barBlurEffect];
         [self addSubview:blurEffectView];
         [blurEffectView autoPinEdgesToSuperviewEdges];
     }
diff --git a/SignalMessaging/Views/OWSNavigationBar.swift b/SignalMessaging/Views/OWSNavigationBar.swift
index 330d3b1d8..2e55f0f2c 100644
--- a/SignalMessaging/Views/OWSNavigationBar.swift
+++ b/SignalMessaging/Views/OWSNavigationBar.swift
@@ -40,57 +40,76 @@ public class OWSNavigationBar: UINavigationBar {
 
     @objc
     public static let backgroundBlurMutingFactor: CGFloat = 0.5
-    var blurEffectView: UIView?
+    var blurEffectView: UIVisualEffectView?
 
     override init(frame: CGRect) {
         super.init(frame: frame)
 
-        if !UIAccessibilityIsReduceTransparencyEnabled() {
+        applyTheme()
+
+        NotificationCenter.default.addObserver(self, selector: #selector(callDidChange), name: .OWSWindowManagerCallDidChange, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(didChangeStatusBarFrame), name: .UIApplicationDidChangeStatusBarFrame, object: nil)
+        NotificationCenter.default.addObserver(self,
+                                               selector: #selector(themeDidChange),
+                                               name: .ThemeDidChange,
+                                               object: nil)
+    }
+
+    // MARK: Theme
+
+    private func applyTheme() {
+        if UIAccessibilityIsReduceTransparencyEnabled() {
+            self.blurEffectView?.removeFromSuperview()
+            let color = Theme.navbarBackgroundColor
+            let backgroundImage = UIImage(color: color)
+            self.setBackgroundImage(backgroundImage, for: .default)
+        } else {
             // Make navbar more translucent than default. Navbars remove alpha from any assigned backgroundColor, so
             // to achieve transparency, we have to assign a transparent image.
             let color = Theme.navbarBackgroundColor.withAlphaComponent(OWSNavigationBar.backgroundBlurMutingFactor)
             let backgroundImage = UIImage(color: color)
             self.setBackgroundImage(backgroundImage, for: .default)
-            let blurEffect = UIBlurEffect(style: .light)
-            let blurEffectView = UIVisualEffectView(effect: blurEffect)
-            blurEffectView.isUserInteractionEnabled = false
-            self.blurEffectView = blurEffectView
+
+            let blurEffect = Theme.barBlurEffect
+
+            let blurEffectView: UIVisualEffectView = {
+                if let existingBlurEffectView = self.blurEffectView {
+                    return existingBlurEffectView
+                }
+
+                let blurEffectView = UIVisualEffectView()
+                blurEffectView.isUserInteractionEnabled = false
+
+                self.blurEffectView = blurEffectView
+                self.insertSubview(blurEffectView, at: 0)
+
+                // navbar frame doesn't account for statusBar, so, same as the built-in navbar background, we need to exceed
+                // the navbar bounds to have the blur extend up and behind the status bar.
+                blurEffectView.autoPinEdgesToSuperviewEdges(with: UIEdgeInsets(top: -statusBarHeight, left: 0, bottom: 0, right: 0))
+
+                return blurEffectView
+            }()
+
+            blurEffectView.effect = blurEffect
 
             // remove hairline below bar.
             self.shadowImage = UIImage()
 
-            self.insertSubview(blurEffectView, at: 0)
             // On iOS11, despite inserting the blur at 0, other views are later inserted into the navbar behind the blur,
             // so we have to set a zindex to avoid obscuring navbar title/buttons.
             blurEffectView.layer.zPosition = -1
 
-            // navbar frame doesn't account for statusBar, so, same as the built-in navbar background, we need to exceed
-            // the navbar bounds to have the blur extend up and behind the status bar.
-            blurEffectView.autoPinEdgesToSuperviewEdges(with: UIEdgeInsets(top: -statusBarHeight, left: 0, bottom: 0, right: 0))
         }
-
-        NotificationCenter.default.addObserver(self, selector: #selector(callDidChange), name: .OWSWindowManagerCallDidChange, object: nil)
-        NotificationCenter.default.addObserver(self, selector: #selector(didChangeStatusBarFrame), name: .UIApplicationDidChangeStatusBarFrame, object: nil)
-        NotificationCenter.default.addObserver(self,
-                                               selector: #selector(themeDidChange),
-                                               name: .ThemeDidChange,
-                                               object: nil)
     }
 
-    // MARK: Layout
-
     @objc
     public func themeDidChange() {
         Logger.debug("\(self.logTag) in \(#function)")
-
-        guard self.backgroundImage(for: .default) != nil else {
-            return
-        }
-        let color = Theme.navbarBackgroundColor.withAlphaComponent(OWSNavigationBar.backgroundBlurMutingFactor)
-        let backgroundImage = UIImage(color: color)
-        self.setBackgroundImage(backgroundImage, for: .default)
+        applyTheme()
     }
 
+    // MARK: Layout
+
     @objc
     public func callDidChange() {
         Logger.debug("\(self.logTag) in \(#function)")
diff --git a/SignalMessaging/categories/Theme.h b/SignalMessaging/categories/Theme.h
index 50333f89e..fc13568c7 100644
--- a/SignalMessaging/categories/Theme.h
+++ b/SignalMessaging/categories/Theme.h
@@ -47,6 +47,7 @@ extern NSString *const ThemeDidChangeNotification;
 @property (class, readonly, nonatomic) UIBarStyle barStyle;
 @property (class, readonly, nonatomic) UISearchBarStyle searchBarStyle;
 @property (class, readonly, nonatomic) UIColor *searchBarBackgroundColor;
+@property (class, readonly, nonatomic) UIBlurEffect *barBlurEffect;
 
 @end
 
diff --git a/SignalMessaging/categories/Theme.m b/SignalMessaging/categories/Theme.m
index 106e9d800..b94b0b907 100644
--- a/SignalMessaging/categories/Theme.m
+++ b/SignalMessaging/categories/Theme.m
@@ -123,6 +123,12 @@ NSString *const ThemeKeyThemeEnabled = @"ThemeKeyThemeEnabled";
     return (Theme.isDarkThemeEnabled ? [UIColor colorWithWhite:0.35f alpha:1.f] : UIColor.ows_light02Color);
 }
 
++ (UIBlurEffect *)barBlurEffect
+{
+    return Theme.isDarkThemeEnabled ? [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark]
+                                    : [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
+}
+
 #pragma mark -
 
 + (UIBarStyle)barStyle