diff --git a/Sources/ContentView.swift b/Sources/ContentView.swift
index 72b3f922..fcd3a6be 100644
--- a/Sources/ContentView.swift
+++ b/Sources/ContentView.swift
@@ -113,7 +113,11 @@ enum SidebarRemoteErrorCopySupport {
 }
 
 func sidebarSelectedWorkspaceBackgroundNSColor(for colorScheme: ColorScheme) -> NSColor {
-    cmuxAccentNSColor(for: colorScheme)
+    if let hex = UserDefaults.standard.string(forKey: "sidebarSelectionColorHex"),
+       let parsed = NSColor(hex: hex) {
+        return parsed
+    }
+    return cmuxAccentNSColor(for: colorScheme)
 }
 
 func sidebarSelectedWorkspaceForegroundNSColor(opacity: CGFloat) -> NSColor {
@@ -11026,6 +11030,8 @@ private struct TabItemView: View, Equatable {
     private var sidebarHideAllDetails = SidebarWorkspaceDetailSettings.defaultHideAllDetails
     @AppStorage(SidebarActiveTabIndicatorSettings.styleKey)
     private var activeTabIndicatorStyleRaw = SidebarActiveTabIndicatorSettings.defaultStyle.rawValue
+    @AppStorage("sidebarSelectionColorHex") private var sidebarSelectionColorHex: String?
+    @AppStorage("sidebarNotificationBadgeColorHex") private var sidebarNotificationBadgeColorHex: String?
 
     var isMultiSelected: Bool {
         selectedTabIds.contains(tab.id)
@@ -11083,7 +11089,10 @@ private struct TabItemView: View, Equatable {
     }
 
     private var activeUnreadBadgeFillColor: Color {
-        usesInvertedActiveForeground ? Color.white.opacity(0.25) : cmuxAccentColor()
+        if let hex = sidebarNotificationBadgeColorHex, let nsColor = NSColor(hex: hex) {
+            return Color(nsColor: nsColor)
+        }
+        return usesInvertedActiveForeground ? Color.white.opacity(0.25) : cmuxAccentColor()
     }
 
     private var activeProgressTrackColor: Color {
@@ -11828,14 +11837,21 @@ private struct TabItemView: View, Equatable {
         .disabled(!hasReadNotifications(in: targetIds))
     }
 
+    private var selectionBackgroundColor: NSColor {
+        if let hex = sidebarSelectionColorHex, let parsed = NSColor(hex: hex) {
+            return parsed
+        }
+        return cmuxAccentNSColor(for: colorScheme)
+    }
+
     private var backgroundColor: Color {
         switch activeTabIndicatorStyle {
         case .leftRail:
-            if isActive        { return Color(nsColor: sidebarSelectedWorkspaceBackgroundNSColor(for: colorScheme)) }
+            if isActive        { return Color(nsColor: selectionBackgroundColor) }
             if isMultiSelected { return cmuxAccentColor().opacity(0.25) }
             return Color.clear
         case .solidFill:
-            if isActive { return Color(nsColor: sidebarSelectedWorkspaceBackgroundNSColor(for: colorScheme)) }
+            if isActive { return Color(nsColor: selectionBackgroundColor) }
             if let custom = resolvedCustomTabColor {
                 if isMultiSelected { return custom.opacity(0.35) }
                 return custom.opacity(0.7)
diff --git a/Sources/cmuxApp.swift b/Sources/cmuxApp.swift
index d70a7303..48d210a9 100644
--- a/Sources/cmuxApp.swift
+++ b/Sources/cmuxApp.swift
@@ -2885,6 +2885,7 @@ private struct SidebarDebugView: View {
     private var showSidebarDevBuildBanner = DevBuildBannerDebugSettings.defaultShowSidebarBanner
     @AppStorage(SidebarActiveTabIndicatorSettings.styleKey)
     private var sidebarActiveTabIndicatorStyle = SidebarActiveTabIndicatorSettings.defaultStyle.rawValue
+    @AppStorage("sidebarSelectionColorHex") private var sidebarSelectionColorHex: String?
 
     private var selectedSidebarIndicatorStyle: SidebarActiveTabIndicatorStyle {
         SidebarActiveTabIndicatorSettings.resolvedStyle(rawValue: sidebarActiveTabIndicatorStyle)
@@ -2897,6 +2898,21 @@ private struct SidebarDebugView: View {
         )
     }
 
+    private var selectionColorBinding: Binding<Color> {
+        Binding(
+            get: {
+                if let hex = sidebarSelectionColorHex, let nsColor = NSColor(hex: hex) {
+                    return Color(nsColor: nsColor)
+                }
+                return cmuxAccentColor()
+            },
+            set: { newColor in
+                let nsColor = NSColor(newColor)
+                sidebarSelectionColorHex = nsColor.hexString()
+            }
+        )
+    }
+
     var body: some View {
         ScrollView {
             VStack(alignment: .leading, spacing: 14) {
@@ -3004,6 +3020,15 @@ private struct SidebarDebugView: View {
                                 Text(style.displayName).tag(style.rawValue)
                             }
                         }
+
+                        ColorPicker(String(localized: "sidebar.debug.selectionColor", defaultValue: "Selection Color"), selection: selectionColorBinding, supportsOpacity: false)
+
+                        if sidebarSelectionColorHex != nil {
+                            Button(String(localized: "sidebar.debug.resetSelectionColor", defaultValue: "Reset to Default")) {
+                                sidebarSelectionColorHex = nil
+                            }
+                            .font(.caption)
+                        }
                     }
                     .padding(.top, 2)
                 }
@@ -3039,6 +3064,7 @@ private struct SidebarDebugView: View {
                     }
                     Button("Reset Active Indicator") {
                         sidebarActiveTabIndicatorStyle = SidebarActiveTabIndicatorSettings.defaultStyle.rawValue
+                        sidebarSelectionColorHex = nil
                     }
                 }
 
@@ -3857,6 +3883,8 @@ struct SettingsView: View {
     @AppStorage(SidebarBranchLayoutSettings.key) private var sidebarBranchVerticalLayout = SidebarBranchLayoutSettings.defaultVerticalLayout
     @AppStorage(SidebarActiveTabIndicatorSettings.styleKey)
     private var sidebarActiveTabIndicatorStyle = SidebarActiveTabIndicatorSettings.defaultStyle.rawValue
+    @AppStorage("sidebarSelectionColorHex") private var sidebarSelectionColorHex: String?
+    @AppStorage("sidebarNotificationBadgeColorHex") private var sidebarNotificationBadgeColorHex: String?
     @AppStorage("sidebarShowBranchDirectory") private var sidebarShowBranchDirectory = true
     @AppStorage("sidebarShowPullRequest") private var sidebarShowPullRequest = true
     @AppStorage(BrowserLinkOpenSettings.openSidebarPullRequestLinksInCmuxBrowserKey)
@@ -3969,6 +3997,36 @@ struct SettingsView: View {
         )
     }
 
+    private var selectionColorBinding: Binding<Color> {
+        Binding(
+            get: {
+                if let hex = sidebarSelectionColorHex, let nsColor = NSColor(hex: hex) {
+                    return Color(nsColor: nsColor)
+                }
+                return cmuxAccentColor()
+            },
+            set: { newColor in
+                let nsColor = NSColor(newColor)
+                sidebarSelectionColorHex = nsColor.hexString()
+            }
+        )
+    }
+
+    private var notificationBadgeColorBinding: Binding<Color> {
+        Binding(
+            get: {
+                if let hex = sidebarNotificationBadgeColorHex, let nsColor = NSColor(hex: hex) {
+                    return Color(nsColor: nsColor)
+                }
+                return cmuxAccentColor()
+            },
+            set: { newColor in
+                let nsColor = NSColor(newColor)
+                sidebarNotificationBadgeColorHex = nsColor.hexString()
+            }
+        )
+    }
+
     private var selectedSocketControlMode: SocketControlMode {
         SocketControlSettings.migrateMode(socketControlMode)
     }
@@ -4836,6 +4894,66 @@ struct SettingsView: View {
 
                         SettingsCardDivider()
 
+                        SettingsCardRow(
+                            String(localized: "settings.workspaceColors.selectionColor", defaultValue: "Selection Highlight"),
+                            subtitle: String(localized: "settings.workspaceColors.selectionColor.subtitle", defaultValue: "Background color of the selected workspace in the sidebar.")
+                        ) {
+                            HStack(spacing: 8) {
+                                if sidebarSelectionColorHex != nil {
+                                    Button(String(localized: "settings.workspaceColors.selectionColor.reset", defaultValue: "Reset")) {
+                                        sidebarSelectionColorHex = nil
+                                    }
+                                    .buttonStyle(.bordered)
+                                    .controlSize(.small)
+                                }
+
+                                ColorPicker(
+                                    "",
+                                    selection: selectionColorBinding,
+                                    supportsOpacity: false
+                                )
+                                .labelsHidden()
+                                .frame(width: 38)
+
+                                Text(sidebarSelectionColorHex ?? String(localized: "settings.sidebarAppearance.defaultLabel", defaultValue: "Default"))
+                                    .font(.system(size: 12, weight: .medium, design: .monospaced))
+                                    .foregroundStyle(.secondary)
+                                    .frame(width: 76, alignment: .trailing)
+                            }
+                        }
+
+                        SettingsCardDivider()
+
+                        SettingsCardRow(
+                            String(localized: "settings.workspaceColors.notificationBadgeColor", defaultValue: "Notification Badge"),
+                            subtitle: String(localized: "settings.workspaceColors.notificationBadgeColor.subtitle", defaultValue: "Color of the unread notification badge on workspace tabs.")
+                        ) {
+                            HStack(spacing: 8) {
+                                if sidebarNotificationBadgeColorHex != nil {
+                                    Button(String(localized: "settings.workspaceColors.notificationBadgeColor.reset", defaultValue: "Reset")) {
+                                        sidebarNotificationBadgeColorHex = nil
+                                    }
+                                    .buttonStyle(.bordered)
+                                    .controlSize(.small)
+                                }
+
+                                ColorPicker(
+                                    "",
+                                    selection: notificationBadgeColorBinding,
+                                    supportsOpacity: false
+                                )
+                                .labelsHidden()
+                                .frame(width: 38)
+
+                                Text(sidebarNotificationBadgeColorHex ?? String(localized: "settings.sidebarAppearance.defaultLabel", defaultValue: "Default"))
+                                    .font(.system(size: 12, weight: .medium, design: .monospaced))
+                                    .foregroundStyle(.secondary)
+                                    .frame(width: 76, alignment: .trailing)
+                            }
+                        }
+
+                        SettingsCardDivider()
+
                         SettingsCardNote(String(localized: "settings.workspaceColors.paletteNote", defaultValue: "Customize the workspace color palette used by Sidebar > Workspace Color. \"Choose Custom Color...\" entries are persisted below."))
 
                         ForEach(Array(workspaceTabDefaultEntries.enumerated()), id: \.element.name) { index, entry in
@@ -5660,6 +5778,8 @@ struct SettingsView: View {
         sidebarShowNotificationMessage = SidebarWorkspaceDetailSettings.defaultShowNotificationMessage
         sidebarBranchVerticalLayout = SidebarBranchLayoutSettings.defaultVerticalLayout
         sidebarActiveTabIndicatorStyle = SidebarActiveTabIndicatorSettings.defaultStyle.rawValue
+        sidebarSelectionColorHex = nil
+        sidebarNotificationBadgeColorHex = nil
         sidebarShowBranchDirectory = true
         sidebarShowPullRequest = true
         openSidebarPullRequestLinksInCmuxBrowser = BrowserLinkOpenSettings.defaultOpenSidebarPullRequestLinksInCmuxBrowser