diff --git a/database/migrations/2026_09_28_000001_create_wishlist_items_table.php b/database/migrations/2026_09_28_000001_create_wishlist_items_table.php
new file mode 100644
index 0000000..d2df658
--- /dev/null
+++ b/database/migrations/2026_09_28_000001_create_wishlist_items_table.php
@@ -0,0 +1,42 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * One product on a logged-in user's wishlist. A guest's wishlist lives in a
+ * cookie instead (see Modules\Core\Wishlist\Services\Wishlist) — nothing is
+ * written here until Modules\Core\Wishlist\Listeners\MergeGuestWishlistOnLogin
+ * moves the cookie's ids across on login.
+ *
+ * hasTable() guard: this table previously lived in each consuming app's own
+ * migrations (e.g. 3dealer's create_wishlist_items_table, extracted here) —
+ * Laravel's migrations table tracks by filename, so a consumer that already
+ * ran its own copy would otherwise hit "table already exists" the first time
+ * this migration runs. Skips creation entirely if the table is already
+ * there; a fresh install with no prior wishlist table gets it created here.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        if (Schema::hasTable('wishlist_items')) {
+            return;
+        }
+
+        Schema::create('wishlist_items', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('product_id')->constrained('lunar_products')->cascadeOnDelete();
+            $table->timestamps();
+
+            $table->unique(['user_id', 'product_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('wishlist_items');
+    }
+};
diff --git a/resources/js/index.js b/resources/js/index.js
index 90e03b3..154fb46 100644
--- a/resources/js/index.js
+++ b/resources/js/index.js
@@ -7,3 +7,4 @@
 // stoic_embed.js is not re-exported here: per its own docblock, it's a
 // standalone vendored script meant to be included directly, not imported.
 export { registerCheckout } from './checkout/index.js'
+export { registerWishlist } from './wishlist/index.js'
diff --git a/resources/js/wishlist/index.js b/resources/js/wishlist/index.js
new file mode 100644
index 0000000..add3860
--- /dev/null
+++ b/resources/js/wishlist/index.js
@@ -0,0 +1,10 @@
+import WishlistController from './wishlist-controller'
+
+// Registers the wishlist module's Stimulus controller onto the host app's
+// Stimulus application. Call once from the host's JS entry point:
+//
+//     import { registerWishlist } from '@boboko/core'
+//     registerWishlist(application)
+export function registerWishlist(application) {
+    application.register('wishlist', WishlistController)
+}
diff --git a/resources/js/wishlist/wishlist-controller.js b/resources/js/wishlist/wishlist-controller.js
new file mode 100644
index 0000000..3591a92
--- /dev/null
+++ b/resources/js/wishlist/wishlist-controller.js
@@ -0,0 +1,42 @@
+import { Controller } from '@hotwired/stimulus'
+
+// Heart toggle. Posts the form with fetch and reflects the server's answer on
+// aria-pressed, which the consuming app's own CSS uses to swap the outline
+// and filled heart. If the request fails, falls back to a normal form submit.
+export default class extends Controller {
+    static targets = ['button', 'status']
+
+    static values = {
+        addLabel: String,
+        removeLabel: String,
+        addedMessage: String,
+        removedMessage: String,
+    }
+
+    async toggle(event) {
+        event.preventDefault()
+
+        if (this.busy) return
+        this.busy = true
+
+        try {
+            const response = await fetch(this.element.action, {
+                method: 'POST',
+                headers: { Accept: 'application/json', 'X-Requested-With': 'XMLHttpRequest' },
+                body: new FormData(this.element),
+            })
+
+            if (!response.ok) throw new Error(`Wishlist toggle failed: ${response.status}`)
+
+            const { active } = await response.json()
+
+            this.buttonTarget.setAttribute('aria-pressed', active ? 'true' : 'false')
+            this.buttonTarget.setAttribute('aria-label', active ? this.removeLabelValue : this.addLabelValue)
+            this.statusTarget.textContent = active ? this.addedMessageValue : this.removedMessageValue
+        } catch {
+            this.element.submit()
+        } finally {
+            this.busy = false
+        }
+    }
+}
diff --git a/src/Providers/WishlistServiceProvider.php b/src/Providers/WishlistServiceProvider.php
new file mode 100644
index 0000000..b40fdfb
--- /dev/null
+++ b/src/Providers/WishlistServiceProvider.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Modules\Core\Providers;
+
+use Illuminate\Support\Facades\Event;
+use Illuminate\Support\ServiceProvider;
+use Modules\Core\Auth\Events\UserAuthenticated;
+use Modules\Core\Wishlist\Listeners\MergeGuestWishlistOnLogin;
+use Modules\Core\Wishlist\Services\WishlistService;
+
+class WishlistServiceProvider extends ServiceProvider
+{
+    public function register(): void
+    {
+        // One instance per request: it caches the guest cookie's ids, so a
+        // toggle and a later has() in the same request agree.
+        $this->app->scoped(WishlistService::class);
+    }
+
+    public function boot(): void
+    {
+        $this->loadRoutesFrom(__DIR__.'/../Wishlist/routes/web.php');
+
+        Event::listen(UserAuthenticated::class, MergeGuestWishlistOnLogin::class);
+    }
+}
diff --git a/src/Wishlist/Http/Controllers/WishlistController.php b/src/Wishlist/Http/Controllers/WishlistController.php
new file mode 100644
index 0000000..d1e166e
--- /dev/null
+++ b/src/Wishlist/Http/Controllers/WishlistController.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Modules\Core\Wishlist\Http\Controllers;
+
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\Routing\Controller;
+use Lunar\Models\Product;
+use Modules\Core\Wishlist\Services\WishlistService;
+
+/**
+ * Adds or removes a product on the current shopper's wishlist — guests and
+ * logged-in shoppers alike (see WishlistService). Page rendering (the
+ * account/guest wishlist list views, with their product-card presentation)
+ * is app-specific and stays in the consuming app; this is only the toggle
+ * action a heart button or plain form posts to.
+ */
+class WishlistController extends Controller
+{
+    public function __construct(
+        private readonly WishlistService $wishlist,
+    ) {}
+
+    /**
+     * The heart button's Stimulus controller asks for JSON; without JS the
+     * form posts normally and comes back to the same page.
+     */
+    public function toggle(Request $request, int $productId): JsonResponse|RedirectResponse
+    {
+        abort_unless(Product::whereKey($productId)->exists(), 404);
+
+        $active = $this->wishlist->toggle($productId);
+
+        if ($request->expectsJson()) {
+            return response()->json(['active' => $active]);
+        }
+
+        return back();
+    }
+}
diff --git a/src/Wishlist/Listeners/MergeGuestWishlistOnLogin.php b/src/Wishlist/Listeners/MergeGuestWishlistOnLogin.php
new file mode 100644
index 0000000..7e6e05a
--- /dev/null
+++ b/src/Wishlist/Listeners/MergeGuestWishlistOnLogin.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Modules\Core\Wishlist\Listeners;
+
+use Modules\Core\Auth\Events\UserAuthenticated;
+use Modules\Core\Wishlist\Services\WishlistService;
+
+/**
+ * Registered from Providers\WishlistServiceProvider — UserAuthenticated fires
+ * inside the login request, so this can read the guest wishlist cookie and
+ * queue its removal.
+ */
+class MergeGuestWishlistOnLogin
+{
+    public function __construct(
+        private readonly WishlistService $wishlist,
+    ) {}
+
+    public function handle(UserAuthenticated $event): void
+    {
+        $this->wishlist->mergeGuestInto($event->user);
+    }
+}
diff --git a/src/Wishlist/Models/WishlistItem.php b/src/Wishlist/Models/WishlistItem.php
new file mode 100644
index 0000000..97de7d0
--- /dev/null
+++ b/src/Wishlist/Models/WishlistItem.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Modules\Core\Wishlist\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * One product on a logged-in user's wishlist. Guests' wishlists live in a
+ * cookie instead — see Modules\Core\Wishlist\Services\Wishlist.
+ */
+class WishlistItem extends Model
+{
+    protected $fillable = ['user_id', 'product_id'];
+}
diff --git a/src/Wishlist/Services/WishlistService.php b/src/Wishlist/Services/WishlistService.php
new file mode 100644
index 0000000..5440e16
--- /dev/null
+++ b/src/Wishlist/Services/WishlistService.php
@@ -0,0 +1,126 @@
+<?php
+
+namespace Modules\Core\Wishlist\Services;
+
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Cookie;
+use Modules\Core\Wishlist\Models\WishlistItem;
+
+/**
+ * The current shopper's wishlist, product ids only.
+ *
+ * Logged in: rows in wishlist_items. Guest: a 1-year cookie holding the ids
+ * (encrypted like every cookie, by the web group's EncryptCookies), so nothing
+ * is written to the database for anonymous visitors. On login the cookie is
+ * merged into the account and cleared (MergeGuestWishlistOnLogin).
+ */
+class WishlistService
+{
+    public const COOKIE = 'wishlist';
+
+    private const COOKIE_MINUTES = 60 * 24 * 365;
+
+    // Keeps the cookie well under the 4KB browser limit.
+    private const GUEST_MAX = 100;
+
+    /** @var array<int>|null ids for this request, including a toggle just made */
+    private ?array $guestIds = null;
+
+    /** @return array<int> newest first */
+    public function ids(): array
+    {
+        if ($user = Auth::user()) {
+            return WishlistItem::where('user_id', $user->id)
+                ->latest('id')
+                ->pluck('product_id')
+                ->all();
+        }
+
+        return $this->guestIds();
+    }
+
+    public function has(int $productId): bool
+    {
+        return in_array($productId, $this->ids(), true);
+    }
+
+    /**
+     * @return bool whether the product is on the wishlist afterwards
+     */
+    public function toggle(int $productId): bool
+    {
+        if ($user = Auth::user()) {
+            $deleted = WishlistItem::where('user_id', $user->id)->where('product_id', $productId)->delete();
+
+            if ($deleted) {
+                return false;
+            }
+
+            WishlistItem::create(['user_id' => $user->id, 'product_id' => $productId]);
+
+            return true;
+        }
+
+        $ids = $this->guestIds();
+
+        if (in_array($productId, $ids, true)) {
+            $this->storeGuestIds(array_values(array_diff($ids, [$productId])));
+
+            return false;
+        }
+
+        $this->storeGuestIds(array_slice([$productId, ...$ids], 0, self::GUEST_MAX));
+
+        return true;
+    }
+
+    public function remove(int $productId): void
+    {
+        if ($this->has($productId)) {
+            $this->toggle($productId);
+        }
+    }
+
+    /**
+     * Moves the guest cookie's products onto $user's wishlist and clears it.
+     */
+    public function mergeGuestInto(Authenticatable $user): void
+    {
+        $ids = $this->guestIds();
+
+        if ($ids === []) {
+            return;
+        }
+
+        // Oldest first, so the newest cookie item also ends up newest here.
+        foreach (array_reverse($ids) as $productId) {
+            WishlistItem::firstOrCreate(['user_id' => $user->id, 'product_id' => $productId]);
+        }
+
+        $this->guestIds = [];
+        Cookie::queue(Cookie::forget(self::COOKIE));
+    }
+
+    /** @return array<int> */
+    private function guestIds(): array
+    {
+        if ($this->guestIds !== null) {
+            return $this->guestIds;
+        }
+
+        $decoded = json_decode((string) request()->cookie(self::COOKIE), true);
+
+        return $this->guestIds = is_array($decoded)
+            ? array_values(array_unique(array_filter(array_map('intval', $decoded))))
+            : [];
+    }
+
+    /** @param  array<int>  $ids */
+    private function storeGuestIds(array $ids): void
+    {
+        $this->guestIds = $ids;
+
+        Cookie::queue(self::COOKIE, json_encode($ids), self::COOKIE_MINUTES);
+    }
+}
diff --git a/src/Wishlist/routes/web.php b/src/Wishlist/routes/web.php
new file mode 100644
index 0000000..0e10b13
--- /dev/null
+++ b/src/Wishlist/routes/web.php
@@ -0,0 +1,9 @@
+<?php
+
+use Illuminate\Support\Facades\Route;
+use Modules\Core\Wishlist\Http\Controllers\WishlistController;
+
+Route::post('wishlist/{productId}', [WishlistController::class, 'toggle'])
+    ->whereNumber('productId')
+    ->middleware('throttle:60,1')
+    ->name('wishlist.toggle');