Seamless way in which it handles scale. We have a lot of spiky request but the reliability of Ably is what sets them apart.

Our product provides real-time reproduction of keystrokes from one client's keyboard to the displays of all others. For our end-users, who rely on our product as their primary means of communication on a continual basis, the most important feature of Ably is its incredible speed and reliability across many geographies. For our developers, the most important feature of Ably has been its ease of integration into many mobile platforms and servers (iOS, web, linux) using many different programming languages (Swift, Javascript, Go). The Ably SDKs are well documented and easy to use, and the implementation behaves exactly as expected from the docs. We have been delighted with the support provided by the Ably team, who are available seemingly day and night. And the few times we've had questions in their off hours, the Ably community on Discord has been very helpful. Last but certainly not least, we were able to develop our entire app and test it with users in production environments before we ever committed to a paid contract with Ably. This allowed us to fully explore the platform without the time pressure of a "free trial period." As an open-source provider on a shoestring budget, this set Ably well apart from other providers we looked at.

We send millions of messages via Ably and have never encountered any problems that have been a fault of theirs. The documentation is extreemly clear and accurate, providing great examples of how to solve certain problems you might encounter. The web console is a very useful tool for debugging and helps us clearly determine what messages are being sent when. I'd highly recommend Ably to anyone looking to remove the hassle of implementing websocket connection, allowing for more time to focus on building fast reliable products.