Knock

https://knock.app/

Knock is a flexible API and dashboard for powering delightful product notification experiences. It helps you ship faster, iterate on your product messaging, and scale your notifications for the long-term. We built product notifications so you don’t have to.

Features:

• Flexible API: Easily integrate with your existing systems to manage notifications.
• Dashboard: A user-friendly interface to monitor and manage your notifications in real-time.
• Customizable Notifications: Tailor your notifications to provide the best user experience.
• Scalability: Built to handle large volumes of notifications as your user base grows.