Guaranteed delivery of an outstanding group chat experience with Ably APIs and SDKs

Deliver reliable and feature-rich group chat experiences at scale with our flexible live chat APIs and SDKs. Ensure a guaranteed quality of service (QoS) for users anywhere with our global realtime infrastructure.


3,000+ events per year with enhanced livestream chat and interactive, realtime features.

1 million live chats supported across 86,000 businesses and their customers.

A leading live streaming platform enabling millions of fans to chat and react together in realtime.

Build and power any group chat experience with our APIs and SDKs

Build a group chat solution tailored to your needs. Then enhance the experience with additional realtime features, using the same flexible messaging APIs and SDKs:

  • Livestream chat enabling participants to interact during live events

  • Team messaging facilitating collaboration between colleagues

  • Community chat increasing connection and engagement

  • Gaming chat allowing players to connect and coordinate in-game

Group chat use cases

Ably has built surge and outage proof chat infrastructure so you don’t have to.

Our fully managed realtime infrastructure is highly redundant and constantly available. Through active traffic management and auto-scaling, we take the stress out of delivering seamless high-concurrency live chat.

Scalable realtime chat backed by a 99.999% uptime SLA

With Ably

Our APIs and SDKs are ideal for chat solutions that need to scale. Highly elastic and fault-tolerant, we can handle millions of concurrent connections arriving in short time periods. With 5x9s peace of mind.

Without Ably

Architecting in-app chat for scale and reliability from day one is essential, extending design and delaying build. Operating costs for globally reliable and highly elastic infrastructure are high, requiring constant capacity and maintenance.

No more bad group chat experiences

With Ably

Our global edge network provides a large, low latency footprint for realtime chat. Our connection handling logic and data replication means no more ghost or unordered chat.

Without Ably

There’s a reason Ably launched after 50,000 hours of engineering investment: you need time to solve for low latency and message guarantees. Don't forget time and effort spent troubleshooting.

Deliver live group chat 3x as fast

With Ably

No tradeoffs between delivering a complete group chat experience or shipping fast. With Ably's chat platform you can deliver rich live chat 3x as fast.

Without Ably

Constant compromises between the speed of shipping and providing the level of chat service users expect.

Reduce cost of development and delivery

With Ably

Deliver within budget and on time, with costs reduced compared to a self-build and upwards of $1M saved in the first year.

Without Ably

Unknown budget and lengthy build time pushes your costs up and revenue down.

Simple integrations, no matter the stack

With Ably

Utilize our managed integrations to connect Ably to any part of your stack, so you can quickly build and easily maintain your realtime chat experience.

Without Ably

Integrations are slow and painstaking to build, requiring manual debugging and maintenance.

Power rich group chat with our flexible building blocks

Pub/sub messaging

We ensure delivery of the right chat message to the right client in realtime. Distribute events to millions of subscribers over channels that support multiplexing with Ably’s feature-rich pub/sub APIs.

Stream resume

Deliver a seamless web or in-app chat experience with messages guaranteed to arrive in the correct order. On disconnect we keep state and retry connection every 15 seconds for two minutes.

Token-based authentication

Manage user permissions with Ably’s flexible token-based authentication options, including JWT.


Presence provides the functionality to identify and communicate about individual behavior in realtime. Use it to build rich chat features including typing indicators, online avatar stacks, and last seen information.

Message interactions

Enhance the realtime chat experience with emoji reactions and other feature-rich experiences.

Push Notifications

Deliver cross-platform push notifications with our iOS and Android SDKs.

Group chat features

No limitations. Customise your chat application to meet you business needs.

Our SDKs and APIs allow you to build a wide variety of bespoke chat capabilities with ease, without being too prescriptive in what you can build:

  • Avatar stacks and active user lists

  • Emoji reactions within the chat session or alongside the stream

  • Typing indicators 

  • Add in-chat links

  • Push notifications - chat has started, they have been @mentioned, or invited to event

  • Custom role creation and management

Chat marchitecture diagram

Build engaging group chat experiences...not the infrastructure to power them.

Enjoy the freedom to focus on delivering a competitive group chat experience, not on building and maintaining realtime infrastructure. We handle everything you need from day one:

  • Guaranteed delivery of a consistent QoS: Provide a seamless user experience for all your users, regardless of where they are or what device they are using. Thanks to our architecture and mathematically-modeled design, we can provide unique data integrity guarantees, even over unreliable networks, and ensure the lowest possible latencies anywhere in the world.

  • Unparalleled reliability at scale: Surges and scale are no longer an issue. Whether you're at billion user scale, scaling fast, or building for scale, we can support all your needs you from day one.

  • Fully customizable: No limitations. Customize to your business requirements. Build the chat solution you want and enhance it with additional realtime features.


Ably is one of the key technologies that underpins our business. Its realtime experience infrastructure seamlessly supports HubSpot's entire realtime needs, helping us to meet our technical, business, and product development requirements. With Ably, we have innovated and taken new products to market much faster while significantly reducing our operational engineering overhead.

Max FreiertProduct Group Lead, HubSpot