You can enable the maintenance mode by going to Online Store > Themes > Customize. Enable the App embed for "Maintenance Script" and click Save. Make sure to configure the general settings from the App admin panel.

The app costs $1 USD per month. We also offer a 3-day free trial so you can test all features before being billed.

Yes, you can fully customize the frontend design. The app provides built-in configuration options, and you can also add custom CSS via the Shopify Theme Customize section under App embeds.

When your website is under construction, customers can leave their email addresses. Once your store is live, you can automatically notify them via customized emails. You can configure the SMTP and email templates from the App admin.