Ntfy – open-source Push to Mobile

Ntfy is a free, open-source HTTP-based service that enables users to send push notifications to their phones or desktops via simple REST API calls or scripts, with support for priorities, attachments, action buttons, and emojis. The service works without requiring sign-up (with topic names serving as passwords) and can be integrated with any tool that supports HTTP requests, making it useful for automating alerts from home automation systems, surveillance cameras, and other applications. It has accumulated over 28,500 GitHub stars since its 2022 launch and is available across multiple platforms including web, mobile apps, and command-line interfaces.