Alphorn is described as 'Open-source, self-hostable notification service that allows you to call a webhook, and receive it on 20+ different channels' and is an website. There are more than 10 alternatives to Alphorn, not only websites but also apps for a variety of platforms, including Android, Android Tablet, iPad and iPhone apps. The best Alphorn alternative is Pushbullet, which is free. Other great sites and apps similar to Alphorn are ntfy, Gotify, Pushover and Sunup.
Share links, files, photos, lists, and notes between phone and desktop, mirror notifications, manage messages, and sync clipboard with multiple platforms or friends using basic or advanced features, including real-time transfers and encryption.
Send notifications to your phone from any Bash or PowerShell script, or from your own app using PUT/POST requests, e.g. via curl on Linux or Invoke-WebRequest.
Gotify is a service for sending (via a REST-API) and receiving (via browser/android app) push notifications.
Pushover is a simple push notification service that integrates easily into web apps, network monitoring systems, shell scripts, and anything else that needs to send alerts to your mobile devices.
A notification platform that helps you track important events across your technical infrastructure. It allows you to send, organize, and manage notifications through a simple REST API.
Pocket Alert allows you to customize and send push notifications to your devices (iOS, Android, Web) with integration via API or Webhooks.
Signalgrid is a realtime push-notification service that offers reliable and secure alerts across all your devices.
ntfy me is a simple push notification app that lets you send notifications to your phone or desktop using HTTP requests or scripts.
Pushinator is a push notification service that lets you send alerts & real-time updates to iOS & Android effortlessly.
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