PubNub can support millions of concurrent connections. Consider that PubNub has thousands of customers and many of those customers have millions of customers that are connection to PubNub and sending/receiving messages constantly to the order of billions of transactions per day.

If you know that your application will have more than 1000 concurrent connections (devices/user), you should contact us to discuss a Pro plan so that you can take advantage of volume discounts and receive free best practice architecture review by one of our experts to optimize you application. Please contact PubNub Support for more details.