diff --git a/src/helpers.php b/src/helpers.php
index 69729cf..acae534 100644
--- a/src/helpers.php
+++ b/src/helpers.php
@@ -38,6 +38,25 @@ function tpl(string $file, string $type = 'structure', string $site = 'main'): v
     }
 }
 
+function app_primary_domain(): string
+{
+    if (defined('APP_DOMAIN_PRIMARY')) {
+        return APP_DOMAIN_PRIMARY;
+    }
+    if (defined('APP_DOMAIN_NAME')) {
+        return APP_DOMAIN_NAME;
+    }
+    return $_SERVER['HTTP_HOST'] ?? '';
+}
+
+function app_fakecheck_domain(): string
+{
+    if (defined('APP_DOMAIN_FAKECHECK')) {
+        return APP_DOMAIN_FAKECHECK;
+    }
+    return app_primary_domain();
+}
+
 function asset_styles(): void
 {
     $styles = app()->assets()->styles();