diff --git a/includes/class-admin.php b/includes/class-admin.php
index 7c28dd6..8b2c933 100644
--- a/includes/class-admin.php
+++ b/includes/class-admin.php
@@ -64,13 +64,30 @@ class WC_EDM_Admin {
 	}
 
 	/**
-	 * Register the submenu page under WooCommerce.
+	 * Register the page under the shared Nolimit menu.
+	 *
+	 * wpmgr_ensure_menu() must be called first and is a no-op when another of
+	 * the five plugins already registered the parent — whichever booted first
+	 * owns it, and none of them may assume it is theirs.
+	 *
+	 * The page slug is unchanged, so admin.php?page=… still resolves: moving a
+	 * page between parents does not move its URL, and an existing bookmark or
+	 * a link in an email keeps working.
 	 */
 	public function register_menu() {
+		if ( function_exists( 'wpmgr_ensure_menu' ) ) {
+			wpmgr_ensure_menu();
+			$parent = WPMGR_MENU_SLUG;
+		} else {
+			// The shared file is missing — a half-copied upgrade. Fall back to
+			// the old home rather than losing the page entirely.
+			$parent = 'woocommerce';
+		}
+
 		add_submenu_page(
-			'woocommerce',
-			__( 'Email Discounts', 'wc-email-discount' ),
-			__( 'Email Discounts', 'wc-email-discount' ),
+			$parent,
+			__( 'Discounts', 'wc-email-discount' ),
+			__( 'Discounts', 'wc-email-discount' ),
 			'manage_woocommerce',
 			self::PAGE_SLUG,
 			array( $this, 'render_page' )
diff --git a/includes/shared-menu.php b/includes/shared-menu.php
new file mode 100644
index 0000000..45dd266
--- /dev/null
+++ b/includes/shared-menu.php
@@ -0,0 +1,221 @@
+<?php
+/**
+ * The one admin menu the manager plugins share.
+ *
+ * ┌──────────────────────────────────────────────────────────────────────────┐
+ * │  THIS FILE IS BYTE-IDENTICAL IN EVERY MANAGER PLUGIN.                     │
+ * │  Do not edit it to add something for one plugin. Extend it through the    │
+ * │  `wpmgr_dashboard_cards` filter, which is what it is for.                 │
+ * │  Contract version 1.0.0 — frozen. See "Why it is frozen" below.           │
+ * └──────────────────────────────────────────────────────────────────────────┘
+ *
+ * The problem it solves: five plugins from the same family, each adding a
+ * top-level menu, is five entries in a sidebar that already has fifteen. So
+ * they share one parent, "Manager", and each adds a submenu under it.
+ *
+ * Three things about how it does that are load-bearing, and none is obvious.
+ *
+ * **1. Every declaration is guarded.** Five plugins each `require_once` their
+ * own copy of this file, in one request. `require_once` only deduplicates by
+ * resolved path, and these are five different paths — so without the
+ * `function_exists()` guard, activating the second plugin is
+ * `Fatal error: Cannot redeclare wpmgr_ensure_menu()`. A white screen on a
+ * shop, caused by nothing except owning two of these plugins. It is the same
+ * shape as the update-hook collision: a fault that exists only when there is
+ * more than one, which means no repository's own tests can find it.
+ *
+ * **2. Whichever copy loads first wins, and that order is arbitrary** — it is
+ * plugin activation order, effectively alphabetical by directory. PHP cannot
+ * un-declare a function, so there is no honest way for a newer copy to replace
+ * an older one that has already been loaded. The only stable answer is that
+ * the file never changes. Hence: **frozen**. The parent slug, the capability,
+ * the position and the filter name are a contract between five repositories
+ * now, and anything new arrives through the filter.
+ *
+ * **3. The dashboard is built from a filter, not owned by a plugin.** If the
+ * plugin that happened to register the menu is deactivated, the menu is
+ * re-registered by the next one on the following request and the page still
+ * renders — because the page's content comes from whoever is installed, not
+ * from whoever created it. Registering a callback that lives in one plugin
+ * would mean deactivating that plugin takes the other four's screens with it.
+ *
+ * Each plugin calls `wpmgr_ensure_menu()` at the top of its own `admin_menu`
+ * callback, before its own `add_submenu_page( 'wpmgr', … )`. Not on some other
+ * hook: `add_submenu_page` against a parent that does not exist yet silently
+ * fails, and whose `admin_menu` runs first is, again, arbitrary.
+ *
+ * The package below is the family, not any one plugin: this file is
+ * byte-identical in five repositories, and a tag naming whichever of them it
+ * was first written in reads as a mistake in the other four — which invites
+ * somebody to "fix" it, in one repository, which is the exact edit the freeze
+ * exists to prevent.
+ *
+ * @package WordPress_Manager_Family
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+if ( ! defined( 'WPMGR_MENU_VERSION' ) ) {
+	define( 'WPMGR_MENU_VERSION', '1.0.0' );
+}
+
+if ( ! defined( 'WPMGR_MENU_SLUG' ) ) {
+	define( 'WPMGR_MENU_SLUG', 'wpmgr' );
+}
+
+if ( ! function_exists( 'wpmgr_ensure_menu' ) ) {
+
+	/**
+	 * Register the shared parent menu, unless somebody already has.
+	 *
+	 * Call this first thing in your own `admin_menu` callback.
+	 */
+	function wpmgr_ensure_menu() {
+		global $admin_page_hooks;
+
+		if ( isset( $admin_page_hooks[ WPMGR_MENU_SLUG ] ) ) {
+			return;
+		}
+
+		/**
+		 * The label on the shared parent menu.
+		 *
+		 * Left untranslated here on purpose: this file is byte-identical in
+		 * five plugins, so it cannot carry any one of their text domains, and
+		 * a string with the wrong domain is a string that is silently never
+		 * translated. Any plugin may translate it in its own domain through
+		 * this filter.
+		 *
+		 * @param string $title The menu title.
+		 */
+		$title = apply_filters( 'wpmgr_menu_title', 'Manager' );
+
+		add_menu_page(
+			$title,
+			$title,
+			'manage_options',
+			WPMGR_MENU_SLUG,
+			'wpmgr_render_dashboard',
+			'dashicons-admin-generic',
+			// Just below WooCommerce (55.x) and above Appearance (60). The
+			// fractional position is not decoration: an integer collides with
+			// whatever core or another plugin put there, and the loser is
+			// simply dropped.
+			58.9
+		);
+	}
+
+	/**
+	 * The shared landing page.
+	 *
+	 * Nothing here knows which plugins exist. Every card comes from the
+	 * filter, so the page is correct whichever of them registered the menu and
+	 * whichever of them have since been deactivated.
+	 */
+	function wpmgr_render_dashboard() {
+		if ( ! current_user_can( 'manage_options' ) ) {
+			wp_die( esc_html( 'You do not have permission to view this page.' ) );
+		}
+
+		/**
+		 * Cards on the shared dashboard, one per installed manager plugin.
+		 *
+		 * Each entry:
+		 *   title    string  Plugin name, already translated by its owner.
+		 *   status   string  'ok' | 'warn' | 'fail' — what the check said.
+		 *   headline string  One short line: the number that matters.
+		 *   lines    array   label => value, a handful at most.
+		 *   url      string  Where "Open" goes.
+		 *   colour   string  The plugin's own colour, as #rrggbb.
+		 *
+		 * Implementations must not measure anything here. This filter runs on
+		 * an admin page load; a card that walks the disk or makes an HTTP
+		 * request turns somebody else's dashboard into a slow page, and they
+		 * will not know why.
+		 *
+		 * @param array $cards The cards so far.
+		 */
+		$cards = apply_filters( 'wpmgr_dashboard_cards', array() );
+
+		echo '<div class="wrap wpmgr-dashboard">';
+		echo '<h1>' . esc_html( apply_filters( 'wpmgr_menu_title', 'Manager' ) ) . '</h1>';
+
+		if ( empty( $cards ) ) {
+			echo '<p>Nothing to report.</p></div>';
+
+			return;
+		}
+
+		echo '<style>'
+			. '.wpmgr-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:20px}'
+			. '.wpmgr-card{background:#fff;border:1px solid #dcdcde;border-radius:8px;padding:0;overflow:hidden}'
+			. '.wpmgr-card header{padding:14px 18px;color:#fff;display:flex;justify-content:space-between;align-items:center}'
+			. '.wpmgr-card header h2{margin:0;font-size:14px;color:inherit}'
+			. '.wpmgr-card .wpmgr-body{padding:16px 18px}'
+			. '.wpmgr-headline{font-size:22px;font-weight:600;margin:0 0 10px}'
+			. '.wpmgr-card dl{display:grid;grid-template-columns:1fr auto;gap:4px 12px;margin:0;font-size:13px}'
+			. '.wpmgr-card dt{color:#646970;margin:0}.wpmgr-card dd{margin:0;text-align:right}'
+			. '.wpmgr-state{font-size:11px;text-transform:uppercase;letter-spacing:.04em;'
+			. 'background:rgba(255,255,255,.22);padding:2px 8px;border-radius:10px}'
+			. '.wpmgr-card footer{padding:12px 18px;border-top:1px solid #f0f0f1}'
+			. '</style>';
+
+		echo '<div class="wpmgr-cards">';
+
+		$states = array(
+			'ok'   => 'OK',
+			'warn' => 'Attention',
+			'fail' => 'Action needed',
+		);
+
+		foreach ( $cards as $card ) {
+			if ( empty( $card['title'] ) ) {
+				continue;
+			}
+
+			$colour = isset( $card['colour'] ) && preg_match( '/^#[0-9a-f]{6}$/i', $card['colour'] )
+				? $card['colour']
+				: '#50575e';
+
+			$status = isset( $card['status'] ) && isset( $states[ $card['status'] ] ) ? $card['status'] : 'ok';
+
+			echo '<section class="wpmgr-card">';
+			printf(
+				'<header style="background:%s"><h2>%s</h2><span class="wpmgr-state">%s</span></header>',
+				esc_attr( $colour ),
+				esc_html( $card['title'] ),
+				esc_html( $states[ $status ] )
+			);
+
+			echo '<div class="wpmgr-body">';
+
+			if ( ! empty( $card['headline'] ) ) {
+				echo '<p class="wpmgr-headline">' . esc_html( $card['headline'] ) . '</p>';
+			}
+
+			if ( ! empty( $card['lines'] ) && is_array( $card['lines'] ) ) {
+				echo '<dl>';
+				foreach ( $card['lines'] as $label => $value ) {
+					echo '<dt>' . esc_html( $label ) . '</dt><dd>' . esc_html( $value ) . '</dd>';
+				}
+				echo '</dl>';
+			}
+
+			echo '</div>';
+
+			if ( ! empty( $card['url'] ) ) {
+				printf(
+					'<footer><a class="button" href="%s">%s</a></footer>',
+					esc_url( $card['url'] ),
+					esc_html( isset( $card['action'] ) ? $card['action'] : 'Open' )
+				);
+			}
+
+			echo '</section>';
+		}
+
+		echo '</div></div>';
+	}
+}
diff --git a/tests/smoke.php b/tests/smoke.php
index 77edebd..0ad08be 100644
--- a/tests/smoke.php
+++ b/tests/smoke.php
@@ -227,6 +227,29 @@ $request  = new WP_REST_Request( 'GET', '/' . WC_EDM_REST_API::REST_NAMESPACE .
 $response = rest_get_server()->dispatch( $request );
 wc_edm_is( 'and they refuse an unauthenticated caller', 401, $response->get_status() );
 
+/* -------------------------------------------------------------- nolimit -- */
+
+// This plugin claims the shared parent menu's label. Asserted through the
+// filter rather than by reading the menu, because the menu is only built in an
+// admin request and this runs under WP-CLI.
+wc_edm_is(
+	'the shared menu is labelled Nolimit',
+	'Nolimit',
+	apply_filters( 'wpmgr_menu_title', 'Manager' )
+);
+
+// includes/shared-menu.php is byte-identical in all five plugins, and which
+// copy a site loads is decided by activation order. Editing it here would make
+// a site with three of five updated show one label or another depending on who
+// booted first — and PHP cannot un-declare a function, so the first copy wins
+// for the whole request. The hash is the guard: change the file and this goes
+// red rather than the behaviour going strange on somebody's shop.
+wc_edm_is(
+	'and the shared menu file is the family copy, unedited',
+	'f4862d5c3a2d24dadddaaec90c9221d61f2923964e164fd525a800ddcec63185',
+	hash_file( 'sha256', WC_EDM_PLUGIN_DIR . 'includes/shared-menu.php' )
+);
+
 /* ------------------------------------------------------------ woocommerce -- */
 
 $compatible = \Automattic\WooCommerce\Utilities\FeaturesUtil::get_compatible_plugins_for_feature( 'custom_order_tables' );
diff --git a/woocommerce-email-discount-manager.php b/woocommerce-email-discount-manager.php
index 1ef3ad7..74394aa 100644
--- a/woocommerce-email-discount-manager.php
+++ b/woocommerce-email-discount-manager.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * Plugin Name: WooCommerce Email Discount Manager
+ * Plugin Name: Nolimit Discounts
  * Plugin URI:  https://gitea.nolimit.dk/kw/woo-discount-manager
  * Update URI:  https://gitea.nolimit.dk/kw/woo-discount-manager
  * Description: Apply discounts and show/hide shipping methods based on the customer's email address (full address, domain or partial match).
@@ -123,6 +123,18 @@ final class WC_Email_Discount_Manager {
 		_doing_it_wrong( __FUNCTION__, 'Unserializing is not allowed.', '1.0.0' );
 	}
 
+	/**
+	 * The label on the shared parent menu all five plugins register under.
+	 *
+	 * A brand name, so it is returned as a literal rather than run through
+	 * __(): translating it would give the product a different name in Danish.
+	 *
+	 * @return string
+	 */
+	public function shared_menu_title() {
+		return 'Nolimit';
+	}
+
 	/**
 	 * Bootstrap once all plugins are loaded.
 	 */
@@ -137,6 +149,20 @@ final class WC_Email_Discount_Manager {
 			$this->updater = new WC_EDM_Updater();
 		}
 
+		// Also deliberately before the WooCommerce check, and for the same
+		// reason as the updater above: the shared parent menu is registered by
+		// whichever of the five plugins boots first, and its label must not
+		// depend on whether THIS plugin got past a gate.
+		//
+		// Registered here rather than by editing includes/shared-menu.php:
+		// that file is byte-identical in all five, and which copy a site loads
+		// is decided by activation order. Changing it there would make a site
+		// with three of five updated show "Manager" or "Nolimit" depending on
+		// who booted first, and change its mind when a plugin is deactivated.
+		// The filter is idempotent, so a plugin still on the old build changes
+		// nothing.
+		add_filter( 'wpmgr_menu_title', array( $this, 'shared_menu_title' ) );
+
 		if ( ! class_exists( 'WooCommerce' ) ) {
 			add_action( 'admin_notices', array( $this, 'woocommerce_missing_notice' ) );
 			return;
@@ -208,6 +234,7 @@ final class WC_Email_Discount_Manager {
 			$files = array_merge(
 				$files,
 				array(
+					'includes/shared-menu.php',
 					'includes/class-admin.php',
 					'includes/class-admin-groups.php',
 					'includes/class-admin-emails.php',