diff --git a/Application/ApplicationManager.php b/Application/ApplicationManager.php
index 4f0e0528f..a43c08e8f 100644
--- a/Application/ApplicationManager.php
+++ b/Application/ApplicationManager.php
@@ -31,6 +31,14 @@ use phpOMS\System\File\PathException;
  */
 final class ApplicationManager
 {
+    /**
+     * Application instance.
+     *
+     * @var ApplicationAbstract
+     * @since 1.0.0
+     */
+    private ApplicationAbstract $app;
+
     /**
      * Applications
      *
@@ -42,10 +50,13 @@ final class ApplicationManager
     /**
      * Constructor.
      *
-     * @since. 1.0.0
+     * @param ApplicationAbstract $app Application
+     *
+     * @since 1.0.0
      */
-    public function __construct()
+    public function __construct(ApplicationAbstract $app)
     {
+        $this->app = $app;
     }
 
     /**
@@ -85,31 +96,30 @@ final class ApplicationManager
     public function install(string $source, string $destination, string $theme = 'Default') : bool
     {
         $destination = \rtrim($destination, '\\/');
+        $source      = \rtrim($source, '/\\');
+
         if (!\is_dir($source) || \is_dir($destination)) {
             return false;
         }
 
-        $app                                         = $this->loadInfo(\rtrim($source, '/\\') . '/info.json');
-        $this->applications[$app->getInternalName()] = $app;
-
-        $this->installFiles($source, $destination);
-        $this->installTheme($destination, $theme);
-
-        $files = Directory::list($destination, '*', true);
-        foreach ($files as $file) {
-            if (!\is_file($destination . '/' . $file)) {
-                continue;
-            }
-
-            $content = \file_get_contents($destination . '/' . $file);
-            if ($content === false) {
-                continue; // @codeCoverageIgnore
-            }
-
-            \file_put_contents($destination . '/' . $file, \str_replace('{APPNAME}', \basename($destination), $content));
+        if (!\is_file($source . '/Admin/Installer.php')) {
+            return false;
         }
 
-        return true;
+        try {
+            $info                                         = $this->loadInfo($source . '/info.json');
+            $this->applications[$info->getInternalName()] = $info;
+
+            $this->installFiles($source, $destination);
+            $this->replacePlaceholder($destination);
+
+            $class = '\\Web\\' . $info->getInternalName() . '\\Admin\\Installer';
+            $class::install($this->app->dbPool, $info, $this->app->appSettings);
+
+            return true;
+        } catch (\Throwable $t) {
+            return false; // @codeCoverageIgnore
+        }
     }
 
     /**
@@ -128,36 +138,28 @@ final class ApplicationManager
     }
 
     /**
-     * Install the theme
+     * Replace placeholder string (application placeholder name)
      *
      * @param string $destination Destination of the application
-     * @param string $theme       Theme name
      *
      * @return void
      *
      * @since 1.0.0
      */
-    private function installTheme(string $destination, string $theme) : void
+    private function replacePlaceholder(string $destination) : void
     {
-        if (!\is_dir($path = $destination . '/Themes/' . $theme)) {
-            return;
-        }
-
-        $dirs = \scandir($path);
-        foreach ($dirs as $dir) {
-            if (!\is_dir($path. '/' . $dir) || $dir === '.' || $dir === '..') {
+        $files = Directory::list($destination, '*', true);
+        foreach ($files as $file) {
+            if (!\is_file($destination . '/' . $file)) {
                 continue;
             }
 
-            if (\is_dir($destination . '/' . $dir)) {
-                Directory::delete($destination . '/' . $dir);
+            $content = \file_get_contents($destination . '/' . $file);
+            if ($content === false) {
+                continue; // @codeCoverageIgnore
             }
 
-            Directory::copy(
-                $destination . '/Themes/' . $theme . '/' . $dir,
-                $destination . '/' . $dir,
-                true
-            );
+            \file_put_contents($destination . '/' . $file, \str_replace('{APPNAME}', \basename($destination), $content));
         }
     }
 }
diff --git a/Application/ApplicationStatus.php b/Application/ApplicationStatus.php
new file mode 100644
index 000000000..9398277c6
--- /dev/null
+++ b/Application/ApplicationStatus.php
@@ -0,0 +1,34 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   phpOMS\Application
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace phpOMS\Application;
+
+use phpOMS\Stdlib\Base\Enum;
+
+/**
+ * App status enum.
+ *
+ * @package phpOMS\Application
+ * @license OMS License 1.0
+ * @link    https://orange-management.org
+ * @since   1.0.0
+ */
+abstract class ApplicationStatus extends Enum
+{
+    public const NORMAL = 1;
+
+    public const READ_ONLY = 2;
+
+    public const DISABLED = 3;
+}
diff --git a/Application/InstallerAbstract.php b/Application/InstallerAbstract.php
new file mode 100644
index 000000000..4fe8ea7fa
--- /dev/null
+++ b/Application/InstallerAbstract.php
@@ -0,0 +1,190 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   phpOMS\Application
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace phpOMS\Application;
+
+use phpOMS\Application\ApplicationInfo;
+use phpOMS\Config\SettingsInterface;
+use phpOMS\DataStorage\Database\DatabasePool;
+use phpOMS\DataStorage\Database\Query\Builder;
+use phpOMS\DataStorage\Database\Schema\Builder as SchemaBuilder;
+
+/**
+ * Installer abstract class.
+ *
+ * @package phpOMS\Application
+ * @license OMS License 1.0
+ * @link    https://orange-management.org
+ * @since   1.0.0
+ */
+abstract class InstallerAbstract
+{
+    /**
+     * Install app.
+     *
+     * @param DatabasePool      $dbPool     Database instance
+     * @param ApplicationInfo        $info       App info
+     * @param SettingsInterface $cfgHandler Settings/Configuration handler
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function install(DatabasePool $dbPool, ApplicationInfo $info, SettingsInterface $cfgHandler) : void
+    {
+        self::createTables($dbPool, $info);
+        self::registerInDatabase($dbPool, $info);
+        self::installSettings($dbPool, $info, $cfgHandler);
+        self::activate($dbPool, $info);
+    }
+
+    /**
+     * Register app in database.
+     *
+     * @param DatabasePool    $dbPool Database instance
+     * @param ApplicationInfo $info   App info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function registerInDatabase(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        $queryApp = new Builder($dbPool->get('insert'));
+        $queryApp->insert('app_name', 'app_theme', 'app_status')
+            ->into('app')
+            ->values($info->getInternalName(), 'Default', ApplicationStatus::NORMAL)
+            ->execute();
+    }
+
+    /**
+     * Install the theme
+     *
+     * @param string $destination Destination of the application
+     * @param string $theme       Theme name
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function installTheme(string $destination, string $theme) : void
+    {
+        if (!\is_dir($path = $destination . '/Themes/' . $theme)) {
+            return;
+        }
+
+        $dirs = \scandir($path);
+        foreach ($dirs as $dir) {
+            if (!\is_dir($path. '/' . $dir) || $dir === '.' || $dir === '..') {
+                continue;
+            }
+
+            if (\is_dir($destination . '/' . $dir)) {
+                Directory::delete($destination . '/' . $dir);
+            }
+
+            Directory::copy(
+                $destination . '/Themes/' . $theme . '/' . $dir,
+                $destination . '/' . $dir,
+                true
+            );
+        }
+    }
+
+    /**
+     * Install app settings.
+     *
+     * @param DatabasePool      $dbPool     Database instance
+     * @param ApplicationInfo   $info       App info
+     * @param SettingsInterface $cfgHandler Settings/Configuration handler
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function installSettings(DatabasePool $dbPool, ApplicationInfo $info, SettingsInterface $cfgHandler) : void
+    {
+        $path = __DIR__ . '/../../Web/' . $info->getInternalName() . '/Admin/Install/Settings.install.php';
+        if (!\is_file($path)) {
+            return;
+        }
+
+        $settings = include $path;
+
+        foreach ($settings as $setting) {
+            $cfgHandler->create($setting);
+        }
+    }
+
+    /**
+     * Create tables for app.
+     *
+     * @param DatabasePool    $dbPool Database instance
+     * @param ApplicationInfo $info   App info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    protected static function createTables(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        $path = __DIR__ . '/../../Web/' . $info->getInternalName() . '/Admin/Install/db.json';
+        if (!\is_file($path)) {
+            return;
+        }
+
+        $content = \file_get_contents($path);
+        if ($content === false) {
+            return; // @codeCoverageIgnore
+        }
+
+        $definitions = \json_decode($content, true);
+        foreach ($definitions as $definition) {
+            SchemaBuilder::createFromSchema($definition, $dbPool->get('schema'))->execute();
+        }
+    }
+
+    /**
+     * Activate after install.
+     *
+     * @param DatabasePool $dbPool Database instance
+     * @param ApplicationInfo   $info   App info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    protected static function activate(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        /** @var StatusAbstract $class */
+        $class = '\\Web\\' . $info->getInternalName() . '\\Admin\\Status';
+        $class::activate($dbPool, $info);
+    }
+
+    /**
+     * Re-init app.
+     *
+     * @param ApplicationInfo $info App info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function reInit(ApplicationInfo $info) : void
+    {
+        $class = '\\Web\\' . $info->getInternalName() . '\\Admin\\Status';
+        $class::activateRoutes($appInfo);
+        $class::activateHooks($appInfo);
+    }
+}
diff --git a/Application/StatusAbstract.php b/Application/StatusAbstract.php
index 7b71ded43..c82533b71 100644
--- a/Application/StatusAbstract.php
+++ b/Application/StatusAbstract.php
@@ -30,21 +30,295 @@ use phpOMS\DataStorage\Database\Query\Builder;
 abstract class StatusAbstract
 {
     /**
-     * Deactivate module in database.
+     * Deactivate app.
      *
      * @param DatabasePool $dbPool Database instance
-     * @param ModuleInfo   $info   Module info
+     * @param ApplicationInfo   $info   Module info
      *
      * @return void
      *
      * @since 1.0.0
      */
-    public static function deactivateInDatabase(DatabasePool $dbPool, ModuleInfo $info) : void
+    public static function activate(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        self::activateRoutes($info);
+        self::activateHooks($info);
+        self::activateInDatabase($dbPool, $info);
+    }
+
+    /**
+     * Init routes.
+     *
+     * @param ApplicationInfo $appInfo Application info
+     *
+     * @return void
+     *
+     * @throws PermissionException
+     *
+     * @since 1.0.0
+     */
+    public static function activateRoutes(ApplicationInfo $appInfo = null) : void
+    {
+        self::installRoutes(__DIR__ . '/../../Web/' . $appInfo->getInternalName() . '/Routes.php', __DIR__ . '/../../Web/' . $appInfo->getInternalName() . '/Admin/Install/Application/Routes.php');
+    }
+
+    /**
+     * Init hooks.
+     *
+     * @param ApplicationInfo $appInfo Application info
+     *
+     * @return void
+     *
+     * @throws PermissionException
+     *
+     * @since 1.0.0
+     */
+    public static function activateHooks(ApplicationInfo $appInfo = null) : void
+    {
+        self::installRoutes(__DIR__ . '/../../Web/' . $appInfo->getInternalName() . '/Hooks.php', __DIR__ . '/../../Web/' . $appInfo->getInternalName() . '/Admin/Install/Application/Hooks.php');
+    }
+
+    /**
+     * Install routes.
+     *
+     * @param string $destRoutePath Destination route path
+     * @param string $srcRoutePath  Source route path
+     *
+     * @return void
+     *
+     * @throws PermissionException
+     *
+     * @since 1.0.0
+     */
+    protected static function installRoutes(string $destRoutePath, string $srcRoutePath) : void
+    {
+        if (!\is_file($destRoutePath)) {
+            \file_put_contents($destRoutePath, '<?php return [];');
+        }
+
+        if (!\is_file($srcRoutePath)) {
+            return;
+        }
+
+        if (!\is_file($destRoutePath)) {
+            throw new PathException($destRoutePath);
+        }
+
+        if (!\is_writable($destRoutePath)) {
+            throw new PermissionException($destRoutePath);
+        }
+
+        /** @noinspection PhpIncludeInspection */
+        $appRoutes = include $destRoutePath;
+        /** @noinspection PhpIncludeInspection */
+        $moduleRoutes = include $srcRoutePath;
+
+        $appRoutes = \array_merge_recursive($appRoutes, $moduleRoutes);
+
+        \file_put_contents($destRoutePath, '<?php return ' . ArrayParser::serializeArray($appRoutes) . ';', \LOCK_EX);
+    }
+
+    /**
+     * Install hooks.
+     *
+     * @param string $destHookPath Destination hook path
+     * @param string $srcHookPath  Source hook path
+     *
+     * @return void
+     *
+     * @throws PathException       This exception is thrown if the hook file doesn't exist
+     * @throws PermissionException This exception is thrown if the hook file couldn't be updated (no write permission)
+     *
+     * @since 1.0.0
+     */
+    protected static function installHooks(string $destHookPath, string $srcHookPath) : void
+    {
+        if (!\is_file($destHookPath)) {
+            \file_put_contents($destHookPath, '<?php return [];');
+        }
+
+        if (!\is_file($srcHookPath)) {
+            return;
+        }
+
+        if (!\is_file($destHookPath)) {
+            throw new PathException($destHookPath);
+        }
+
+        if (!\is_writable($destHookPath)) {
+            throw new PermissionException($destHookPath);
+        }
+
+        /** @noinspection PhpIncludeInspection */
+        $appHooks = include $destHookPath;
+        /** @noinspection PhpIncludeInspection */
+        $moduleHooks = include $srcHookPath;
+
+        $appHooks = \array_merge_recursive($appHooks, $moduleHooks);
+
+        \file_put_contents($destHookPath, '<?php return ' . ArrayParser::serializeArray($appHooks) . ';', \LOCK_EX);
+    }
+
+    /**
+     * Deactivate routes.
+     *
+     * @param ApplicationInfo $appInfo Application info
+     *
+     * @return void
+     *
+     * @throws PermissionException
+     *
+     * @since 1.0.0
+     */
+    public static function deactivateRoutes(ApplicationInfo $appInfo) : void
+    {
+        self::installRoutes(__DIR__ . '/../../Web/' . $appInfo->getInternalName() . '/Routes.php', __DIR__ . '/../../Web/' . $appInfo->getInternalName() . '/Admin/Install/Application/Routes.php');
+    }
+
+    /**
+     * Deactivate hooks.
+     *
+     * @param ApplicationInfo $appInfo Application info
+     *
+     * @return void
+     *
+     * @throws PermissionException
+     *
+     * @since 1.0.0
+     */
+    public static function deactivateHooks(ApplicationInfo $appInfo) : void
+    {
+        self::installRoutes(__DIR__ . '/../../Web/' . $appInfo->getInternalName() . '/Hooks.php', __DIR__ . '/../../Web/' . $appInfo->getInternalName() . '/Admin/Install/Application/Hooks.php');
+    }
+
+    /**
+     * Uninstall routes.
+     *
+     * @param string $destRoutePath Destination route path
+     * @param string $srcRoutePath  Source route path
+     *
+     * @return void
+     *
+     * @throws PermissionException
+     *
+     * @since 1.0.0
+     */
+    public static function uninstallRoutes(string $destRoutePath, string $srcRoutePath) : void
+    {
+        if (!\is_file($destRoutePath)
+            || !\is_file($srcRoutePath)
+        ) {
+            return;
+        }
+
+        if (!\is_file($destRoutePath)) {
+            throw new PathException($destRoutePath);
+        }
+
+        if (!\is_writable($destRoutePath)) {
+            throw new PermissionException($destRoutePath);
+        }
+
+        /** @noinspection PhpIncludeInspection */
+        $appRoutes = include $destRoutePath;
+        /** @noinspection PhpIncludeInspection */
+        $moduleRoutes = include $srcRoutePath;
+
+        $appRoutes = ArrayUtils::array_diff_assoc_recursive($appRoutes, $moduleRoutes);
+
+        \file_put_contents($destRoutePath, '<?php return ' . ArrayParser::serializeArray($appRoutes) . ';', \LOCK_EX);
+    }
+
+    /**
+     * Uninstall hooks.
+     *
+     * @param string $destHookPath Destination hook path
+     * @param string $srcHookPath  Source hook path
+     *
+     * @return void
+     *
+     * @throws PermissionException
+     *
+     * @since 1.0.0
+     */
+    protected static function uninstallHooks(string $destHookPath, string $srcHookPath) : void
+    {
+        if (!\is_file($destHookPath)
+            || !\is_file($srcHookPath)
+        ) {
+            return;
+        }
+
+        if (!\is_file($destHookPath)) {
+            throw new PathException($destHookPath);
+        }
+
+        if (!\is_writable($destHookPath)) {
+            throw new PermissionException($destHookPath);
+        }
+
+        /** @noinspection PhpIncludeInspection */
+        $appHooks = include $destHookPath;
+        /** @noinspection PhpIncludeInspection */
+        $moduleHooks = include $srcHookPath;
+
+        $appHooks = ArrayUtils::array_diff_assoc_recursive($appHooks, $moduleHooks);
+
+        \file_put_contents($destHookPath, '<?php return ' . ArrayParser::serializeArray($appHooks) . ';', \LOCK_EX);
+    }
+
+    /**
+     * Deactivate app in database.
+     *
+     * @param DatabasePool $dbPool Database instance
+     * @param ApplicationInfo   $info   Module info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function activateInDatabase(DatabasePool $dbPool, ApplicationInfo $info) : void
     {
         $query = new Builder($dbPool->get('update'));
         $query->update('app')
-            ->sets('app.app_active', ModuleStatus::INACTIVE)
-            ->where('app.app_id', '=', $info->getInternalName())
+            ->sets('app.app_status', ApplicationStatus::NORMAL)
+            ->where('app.app_name', '=', $info->getInternalName())
+            ->execute();
+    }
+
+    /**
+     * Deactivate app.
+     *
+     * @param DatabasePool $dbPool Database instance
+     * @param ApplicationInfo   $info   Module info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function deactivate(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        self::deactivateRoutes($info);
+        self::deactivateHooks($info);
+        self::deactivateInDatabase($dbPool, $info);
+    }
+
+    /**
+     * Deactivate app in database.
+     *
+     * @param DatabasePool $dbPool Database instance
+     * @param ApplicationInfo   $info   Module info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function deactivateInDatabase(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        $query = new Builder($dbPool->get('update'));
+        $query->update('app')
+            ->sets('app.app_status', ApplicationStatus::DISABLED)
+            ->where('app.app_name', '=', $info->getInternalName())
             ->execute();
     }
 }
diff --git a/Application/UninstallerAbstract.php b/Application/UninstallerAbstract.php
new file mode 100644
index 000000000..2f900ff79
--- /dev/null
+++ b/Application/UninstallerAbstract.php
@@ -0,0 +1,116 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   phpOMS\Application
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace phpOMS\Application;
+
+use phpOMS\DataStorage\Database\DatabasePool;
+use phpOMS\DataStorage\Database\Query\Builder;
+use phpOMS\DataStorage\Database\Schema\Builder as SchemaBuilder;
+
+/**
+ * Uninstaller abstract class.
+ *
+ * @package phpOMS\Application
+ * @license OMS License 1.0
+ * @link    https://orange-management.org
+ * @since   1.0.0
+ */
+abstract class UninstallerAbstract
+{
+    /**
+     * Install module.
+     *
+     * @param DatabasePool $dbPool Database instance
+     * @param ApplicationInfo   $info   App info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function uninstall(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        self::deactivate($dbPool, $info);
+        self::dropTables($dbPool, $info);
+        self::unregisterFromDatabase($dbPool, $info);
+    }
+
+    /**
+     * Activate after install.
+     *
+     * @param DatabasePool $dbPool Database instance
+     * @param ApplicationInfo   $info   App info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    protected static function deactivate(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        /** @var StatusAbstract $class */
+        $class = '\Web\\' . $info->getInternalName() . '\Admin\Status';
+        $class::deactivate($dbPool, $info);
+    }
+
+    /**
+     * Drop tables of app.
+     *
+     * @param DatabasePool $dbPool Database instance
+     * @param ApplicationInfo   $info   App info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function dropTables(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        $path = __DIR__ . '/../../Web/' . $info->getInternalName() . '/Admin/Install/db.json';
+
+        if (!\is_file($path)) {
+            return;
+        }
+
+        $content = \file_get_contents($path);
+        if ($content === false) {
+            return; // @codeCoverageIgnore
+        }
+
+        $definitions = \json_decode($content, true);
+        $builder     = new SchemaBuilder($dbPool->get('schema'));
+
+        foreach ($definitions as $definition) {
+            $builder->dropTable($definition['table'] ?? '');
+        }
+
+        $builder->execute();
+    }
+
+    /**
+     * Unregister app from database.
+     *
+     * @param DatabasePool $dbPool Database instance
+     * @param ApplicationInfo   $info   App info
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    public static function unregisterFromDatabase(DatabasePool $dbPool, ApplicationInfo $info) : void
+    {
+        $queryApp = new Builder($dbPool->get('delete'));
+        $queryApp->delete()
+            ->from('app')
+            ->where('app_name', '=', $info->getInternalName())
+            ->execute();
+    }
+}