binwiederhier/ntfy

ntfy (pronounced "notify") is a simple notification service that lets you send push notifications to your phone or computer by making a basic web request, no sign-up, no app registration, and no complex setup required. The idea is that any script, server, or automated process can notify you the moment something happens. The way it works is through a publish-subscribe model: you subscribe to a topic (essentially a named channel, which can be any word you choose) on your phone or browser, and then anything that sends a message to that topic URL, using a simple web request, appears instantly as a notification. For example, a backup script finishing, a server running out of disk space, or a download completing could all trigger a notification without you needing to be watching a terminal. You can use the free public service at ntfy.sh without creating an account, or self-host the open-source server on your own machine if you want privacy or more control. There are companion apps for Android and iOS, and a web interface for subscribing from a browser. You would use ntfy when you have a background process, a script, a scheduled job, a home server, anything that runs unattended, and you want it to be able to reach you on your phone when something needs attention. The server is written in Go. The service also offers a paid tier with additional features for those who prefer not to self-host.