If you are adding messaging to a product, whether that is customer support chat, in-app community messaging, or internal employee communication, you rarely need to build the whole stack yourself. The category of hosted platforms that handle the real-time plumbing for you is usually called Chat-as-a-Service (CaaS). A good CaaS platform gets you from zero to a working prototype in days and can carry a production app to millions of users, provided you pick one that matches your requirements.
This post compares the main platforms developers keep shortlisting in 2026: CometChat, Sendbird, Twilio Conversations, PubNub, and Stream. We first published this comparison in early 2024 and have refreshed it to reflect where each vendor stands today. If you are building specifically with React Native, we maintain a separate, more hands-on comparison of chat SDKs for RN, see our best chat SDK for React Native guide.
What changed since the original version of this post
The biggest correction concerns Twilio. The original article referenced Twilio’s chat product loosely, but Twilio Programmable Chat was formally sunset back in July 2022. Its replacement, Twilio Conversations, is the product you would evaluate today. Conversations is not a like-for-like chat SDK. It is an omnichannel messaging API that treats in-app chat as one channel alongside SMS, MMS, and WhatsApp, and it is priced per active user and per message rather than as a flat chat subscription. That reframing matters for how you should compare it against the pure chat vendors below.
The other notable industry shift: every vendor in this list now ships some flavor of AI features, from moderation and translation to bot frameworks. Treat vendor AI claims the way you treat any roadmap material. Verify the specific capability you need actually exists in the SDK you plan to use, on the platform you plan to ship to.
Comparison parameters
- Ease of integration, how quickly you get to a working chat screen
- Feature set, messaging depth plus voice, video, and moderation
- Scalability, concurrent users and message throughput
- Documentation and support
- Customization, UI kits versus raw APIs
- Pricing model, subscription tiers versus usage-based
- Security and compliance, HIPAA, GDPR, data residency
Platform comparison table
| Parameter | CometChat | Sendbird | Twilio Conversations | PubNub | Stream |
|---|---|---|---|---|---|
| Ease of integration | Easy (UI kits) | Easy (UI kits) | Medium (API-first) | Medium (build your own UI) | Easy (UI kits) |
| Feature set | Chat, voice, video, moderation | Chat, calls, moderation, AI agents | Chat plus SMS, MMS, WhatsApp in one thread | Real-time infrastructure, presence, signals | Chat, threads, reactions, video, feeds |
| Scalability | High | High | High | High | High |
| Docs and support | Good | Excellent | Excellent | Good | Excellent |
| Customization | Medium | Medium | High (no UI provided) | High (no UI provided) | High |
| Pricing model | Subscription tiers | Subscription tiers by MAU | Usage-based, per active user and message | Usage-based | Subscription tiers by MAU |
| Compliance | GDPR, HIPAA options | GDPR, HIPAA options | GDPR, HIPAA options | GDPR, HIPAA options | GDPR, HIPAA options |
A note on the compliance row: every vendor here can support GDPR and HIPAA workloads, but HIPAA support in particular is usually gated behind higher-tier plans and a signed BAA. Confirm the plan requirement before you architect around it.
Detailed analysis
CometChat
CometChat’s pitch is speed to market. Its UI kits for web, iOS, Android, and React Native are among the most complete in the category, so teams that want a conventional chat experience without designing one from scratch tend to land here. Text chat, voice and video calling, and moderation tooling are all first-party. The trade-off is that the further your design diverges from the UI kit defaults, the more you fight the framework. Pricing is subscription-based with tiers keyed to usage and features. A solid default choice for product teams that value shipping fast over deep customization.
Sendbird
Sendbird remains one of the most mature vendors in the space, with a track record of very large consumer deployments in delivery, marketplace, and community apps. The core chat SDK is polished, moderation and admin tooling are strong, and in recent years the company has pushed hard into AI agents for customer support built on top of its messaging layer. Documentation is excellent. Customization sits in the middle: UI kits get you started, and lower-level SDKs are available when you outgrow them. Pricing is subscription-based and scales with monthly active users, which is predictable but worth modeling carefully if your app has many low-engagement users.
Twilio Conversations
This is the entry that has changed most since 2024. Programmable Chat is gone; Conversations is the current product and has been for several years. Its differentiator is genuinely unique in this list: a single conversation object can span in-app chat, SMS, and WhatsApp, so a support agent in your web app can talk to a customer who is replying over text message. If cross-channel messaging is your actual requirement, nothing else here does it as directly.
As a pure in-app chat SDK, though, Conversations is leaner than the dedicated chat vendors. There are no polished UI kits comparable to CometChat or Stream, so budget for building your own interface. Pricing is usage-based, per active user plus per-message and channel fees, which can be economical at low volume and needs careful modeling at scale. Choose Twilio for omnichannel, not because you want the richest chat feature set.
PubNub
PubNub is best understood as real-time infrastructure rather than a chat product. It gives you low-latency publish and subscribe messaging, presence, and signals, and a chat SDK layered on top, but you own the data model and the UI. That makes it the most flexible option here and also the one with the most engineering surface area. Teams pick PubNub when chat is one of several real-time features, alongside live dashboards, multiplayer state, or IoT telemetry, and they want one transport for all of it. Pricing is usage-based.
Stream
Stream has become the default recommendation in a lot of developer communities, and for defensible reasons. The React and React Native SDKs are excellent, the component library is genuinely customizable rather than themable-only, and features like threads, reactions, offline support, and message retention are well executed. Stream also offers video and activity feeds if you need adjacent functionality from one vendor. Documentation is a strong point. Pricing is subscription-based by MAU with an entry tier that suits early-stage products. If you are building in React Native specifically, Stream belongs on your shortlist, see our RN comparison linked above for how it stacks up in that context.
What about self-hosted and open source?
One question we get far more often in 2026 than in 2024: what if the data cannot leave our infrastructure? Healthcare, finance, and public sector teams increasingly reject the hosted CaaS model outright. In that case you are looking at open source stacks you run yourself. Options include Matrix, Rocket.Chat, and Ethora (our product, an open source chat and AI SDK with React Native support), each with different trade-offs between control and operational burden. That is a separate evaluation from the hosted vendors above, but it is worth ruling in or out before you sign a CaaS contract, because migrating off a hosted chat platform later is painful.
Conclusion
The hosted chat market has consolidated around a few clear positions. CometChat and Sendbird are the fastest paths to a full-featured, conventional chat experience. Stream offers the best balance of UI kits and customization, especially for React and React Native teams. Twilio Conversations is the right call when the requirement is omnichannel messaging across chat, SMS, and WhatsApp rather than in-app chat alone, just remember that Programmable Chat no longer exists and any older comparison referencing it is out of date. PubNub is infrastructure for teams building custom real-time experiences where chat is one piece.
Match the platform to your actual requirement: time to market, customization depth, cross-channel reach, or data control. And if React Native is your stack, start with our dedicated React Native chat SDK comparison before committing.