PubNub is a Pub/Sub service for sending data between devices in realtime. It is ideal for developers building chat apps, IoT device signaling, realtime GPS location tracking, multiplayer online games & more. Messages generally make it from publisher to subscriber in 80100ms, regardless of their locations. There are PubNub SDKs for every programming language so your server, web browser, mobile phone or smart device can use PubNub right away. After free signup, you get live API keys instantly.