ntfy.sh is a free notification service that lets you receive notifications from servers, home automation projects, and your Raspberry Pi. It’s great for IT administrators and tech enthusiasts who need to get live status updates on their infrastructure.
To use ntfy.sh, create a topic with a unique name and subscribe to it using the app or web browser. Then, send notifications to that topic from your scripts or code, and any subscribed devices will receive the notification. You can use public servers for free or set up your own self-hosted instance.
You can integrate ntfy.sh into home automation projects or scripts by adding a simple command to your Bash or Python scripts. It’s also useful for monitoring servers and receiving alerts when backups succeed or fail.
The service is available on multiple platforms, including Apple and Android mobile devices, desktop web browsers, and even the Windows Task Scheduler. You can test it out with sample scripts and code examples provided in the documentation.
Note that ntfy.sh uses authentication to secure sensitive information, so make sure to only send alerts and not credentials or identifying information in your notifications.
Source: https://www.howtogeek.com/need-push-notifications-from-your-server-this-tool-is-better-than-discord