PushRadar is a realtime notifications API service for the web, featuring advanced targeting. The service uses a simple publish-subscribe model, that allows you to broadcast 'notifications' on specific 'channels', that are subscribed to by one or more clients, who are the visitors or users of your website or web app. Only two lines of code are needed to broadcast notifications from your server, and receive them client-side using JavaScript. PushRadar allows you to send targeted notifications; you can target clients by geographical location (countries & continents), IP address, web browser and user ID. With 'action targeting', you can send notifications to clients who have taken a certain action on your website or web app, such as purchase an item. PushRadar's Basic plan allows you to send 1 million notifications per day to 500 concurrent users. AutoScaling on Premium allows you to effortlessly scale to hundreds of thousands of concurrent users.