diff --git a/README.md b/README.md
index dfa7bfec..e0630280 100644
--- a/README.md
+++ b/README.md
@@ -240,6 +240,8 @@ Rectangle uses [Swift Package Manager](https://www.swift.org/package-manager/) t
 
 The original repository for MASShortcut was archived, so Rectangle uses my [fork](https://github.com/rxhanson/MASShortcut). If you want to make any changes that involve MASShortcut, please make a pull request on my fork. 
 
+Debug builds use the bundle identifier `com.knollsoft.Rectangle.debug`, so a build from Xcode gets its own Accessibility permission and preferences instead of sharing the installed copy's. Quit the installed Rectangle while running a Debug build, since both respond to the same shortcuts and window drags. Use the `.debug` identifier with `defaults` and `tccutil`. For example, an ad-hoc signed build needs its permission granted again after rebuilding, and `tccutil reset Accessibility com.knollsoft.Rectangle.debug` clears the stale entry.
+
 Due to the addition of the Liquid Glass icon with a fallback for older versions of macOS, there will be a build failure on macOS versions < 26. You can delete the "Asset Catalog Other Flags" to build locally on versions < 26 (but don't check that change in if you create a pull request).
 
 ## Credits
diff --git a/Rectangle.xcodeproj/project.pbxproj b/Rectangle.xcodeproj/project.pbxproj
index 8a5f78a6..c4584d6a 100644
--- a/Rectangle.xcodeproj/project.pbxproj
+++ b/Rectangle.xcodeproj/project.pbxproj
@@ -1462,7 +1462,7 @@
 				);
 				MACOSX_DEPLOYMENT_TARGET = "$(RECOMMENDED_MACOSX_DEPLOYMENT_TARGET)";
 				MARKETING_VERSION = 2.0.3;
-				PRODUCT_BUNDLE_IDENTIFIER = com.knollsoft.Rectangle;
+				PRODUCT_BUNDLE_IDENTIFIER = com.knollsoft.Rectangle.debug;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_EMIT_LOC_STRINGS = YES;
diff --git a/Rectangle/AppDelegate.swift b/Rectangle/AppDelegate.swift
index 126f3082..b4a5b1bd 100644
--- a/Rectangle/AppDelegate.swift
+++ b/Rectangle/AppDelegate.swift
@@ -7,8 +7,6 @@ import os.log
 @main
 class AppDelegate: NSObject, NSApplicationDelegate {
 
-    static let launcherAppId = "com.knollsoft.RectangleLauncher"
-
     private let accessibilityAuthorization = AccessibilityAuthorization()
     private let statusItem = RectangleStatusItem.instance
     static let windowHistory = WindowHistory()
diff --git a/Rectangle/ApplicationToggle.swift b/Rectangle/ApplicationToggle.swift
index 26b2b197..e38cac5e 100644
--- a/Rectangle/ApplicationToggle.swift
+++ b/Rectangle/ApplicationToggle.swift
@@ -5,7 +5,7 @@ import Cocoa
 class ApplicationToggle: NSObject {
     
     private var disabledApps = Set<String>()
-    public private(set) static var frontAppId: String? = "com.knollsoft.Rectangle"
+    public private(set) static var frontAppId: String? = Bundle.main.bundleIdentifier
     public private(set) static var frontAppName: String? = "Rectangle"
     public private(set) static var shortcutsDisabled: Bool = false
 
diff --git a/RectangleTests/RectangleTests.swift b/RectangleTests/RectangleTests.swift
index 98b52fae..c09c7712 100644
--- a/RectangleTests/RectangleTests.swift
+++ b/RectangleTests/RectangleTests.swift
@@ -1968,6 +1968,21 @@ class DefaultsExportTests: XCTestCase {
     }
 }
 
+final class BundleIdentityTests: XCTestCase {
+
+    func testDebugBuildsUseTheirOwnBundleIdentifier() {
+        // Keeps a build from Xcode from sharing the installed app's
+        // Accessibility permission and preferences.
+        XCTAssertEqual(Bundle.main.bundleIdentifier, "com.knollsoft.Rectangle.debug")
+    }
+
+    func testExportedConfigKeepsTheReleaseBundleIdentifier() throws {
+        let json = try XCTUnwrap(Defaults.encoded())
+        let config = try XCTUnwrap(Defaults.convert(jsonString: json))
+        XCTAssertEqual(config.bundleId, "com.knollsoft.Rectangle")
+    }
+}
+
 class ConfigImportTests: XCTestCase {
 
     private static let shortcutKeys = WindowAction.active.map(\.name) + TodoManager.defaultsKeys + StackBadgeManager.defaultsKeys