I am in process of developing an application which is a marketing tool helps to keep your users engaged by sending notifications to them about any relevant information. Itallows to create notification campaigns by four methods i.e. Push Notification, Email, SMS, In App Notification and you can filter out your audience by choosing any specific field such as gender, location, age, etc. in your website/application and send notifications to that particular users only.
This application will be used as a shopify plugin which you can integrate it with your website or mobile app for sending notifications to your audience to keep them busy.
For more concerns please reach out to me at email@example.com.