ntfy is a simple HTTP-based pub-sub notification service. It allows you to send notifications to your phone or desktop via scripts from any computer, and/or using a REST API.
If all you need is to get a notification on your phone, you can use web browser Notification API for free. All you need is a https web server with properly configured certificates and DNS entry, which you can also get for free.
If all you need is to get a notification on your phone, you can use web browser Notification API for free. All you need is a https web server with properly configured certificates and DNS entry, which you can also get for free.