![]() Reliability: Chat needs to be always available-even if something goes wrong.For a chat app to succeed in the long term, it has to be able to react to sudden changes and elastically scale to handle a high, unpredictable, and fluctuating number of concurrent users. Elasticity: A chat app that crashes when it gets more users than expected will never remain competitive.The Pub/Sub messaging pattern is a good foundation for a chat app, since it decouples the communication logic from the business logic, making your system easier to scale. Scalability: Having a highly available and resilient infrastructure allows a chat app to grow on par with its user base.Ensuring data integrity is difficult, but critical to prevent missed, unordered, or duplicate messages. Message delivery guarantees: Chat relies on messages being delivered to the right client, in the right order, at the right time.This relies on a combination of factors, including a high throughput, an efficient, low-latency messaging protocol (like WebSockets), and geographic proximity between users and servers. ![]() Low latency data delivery: The promise of realtime means users should receive messages on their devices without delay.Let’s start by taking a closer look at what every winning chat app has in common. ![]() The foundations of a successful chat or messaging app To help you hit the ground running, this article provides an overview of what it takes to create a live chat app: the features you need, how best to build them, the challenges you can expect, and everything you need to know about delivering reliable, scalable realtime messaging. There are features to choose, communication protocols to juggle, and infrastructure decisions that can make or break your chat system. But building realtime chat requires some heavy lifting-especially if you’re starting from scratch. This expectation is even higher for chat, which is now embedded in everything from e-commerce platforms to online gaming. Messages should arrive instantly, dashboards should deliver business metrics as they happen, and live sports scores should broadcast to fans around the world in a blink. We all expect online experiences to happen in realtime.
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