What it does
ntfy (pronounced 'notify') lets you send push notifications to your phone or desktop with a simple HTTP request: PUT or POST a message to a topic URL such as ntfy.sh/mytopic, and every device subscribed to that topic gets it. Messages can have a title, priority, tags, attachments, click actions and scheduled delivery. Apps are available for Android, iOS and the web. Free on ntfy.sh, and open source so you can host it yourself.
More information: https://docs.ntfy.sh/
