Stream vs. CometChat: The Definitive Comparison (2026)

Stream and CometChat are two of the most-evaluated platforms for teams building real-time communication into their products.

Both offer APIs, SDKs, and UI components for messaging, audio, and video. But they are built around different philosophies: 

• Stream is engineered for deep customization and extreme scale,

• CometChat is designed to get you to production fast with lower entry prices.

This guide breaks down both platforms across pricing, features, SDKs, scalability, moderation, and developer experience so your team can make an informed decision.

TL;DR: Stream vs. CometChat

Platform Overview

What is Stream?

Stream's product suite spans chat, video/ audio, activity feeds, and AI moderation — with voice agents, AI chatbot integration (supporting OpenAI, Claude, Gemini, and others), and Vision Agents, an open-source framework for building real-time voice and video AI applications, rounding out the platform.

Stream's backend is built on Go, RocksDB, and Raft, an architecture designed for high throughput and low latency at scale. The platform targets use cases ranging from social apps and marketplaces to gaming, healthcare, and enterprise collaboration.

What is CometChat?

CometChat's platform is organized around two pillars: real-time user communication (chat & messaging, voice & video calls) and a full-stack AI agent platform for building and deploying user-facing conversational AI agents. Shared services (moderation, analytics, notifications, and multi-tenant infrastructure) run across both pillars.

A defining characteristic of CometChat is its range of integration paths. Teams can start with a no-code Widget Builder, move to a low-code UI Kit Builder, use pre-built UI Kits, or go fully custom with open-source SDKs and APIs. This flexibility is designed to let teams ship at whatever speed and level of control their product requires.

Features & Capabilities

Messaging

Both platforms cover the core feature set teams expect, such as 1:1 and group messaging, typing indicators, read receipts, presence, threads, reactions, rich media, push notifications, and message search.

Where they differ:

• Message retention: Stream offers unlimited message storage on paid plans. CometChat caps retention at 6 months across all plans.

• Integration approach: CometChat offers a no-code Widget Builder and a low-code UI Kit Builder, letting non-engineering teams ship messaging without writing code. Stream is developer-first; integration requires engineering resources, but offers significantly more control over UI and behavior.

• Scale: Stream pulls ahead for high-concurrency use cases. Its architecture supports up to 5 million concurrent connections per channel, with sub-40ms latency on its global edge network.

Takeaway: Stream is a better fit for high-scale, custom-built products. CometChat is convenient for teams that need to ship messaging quickly without dedicated frontend resources.

Audio & Video

Both platforms offer 1:1 and group video calling, voice-only calling, screen sharing, call recording, transcription, in-call reactions, picture-in-picture, adaptive bandwidth optimization, and HIPAA-compliant calling on their respective paid tiers.

Where they differ:

• Livestreaming: Stream offers livestreaming as distinct, production-ready product. CometChat does not offer an equivalent.

• Voice Agents: Stream supports real-time voice AI running directly on calls via its global edge network. CometChat does not offer an equivalent.

• Pricing model: Both are pay-as-you-go per user minute. Stream's entry audio-only rate is $0.30 per 1,000 participant minutes; CometChat's voice calling rate is $1.00 per 1,000 participant minutes.

Takeaway: If voice and video are central to your product, Stream offers more coverage, including livestreaming, Voice Agents, and a lower per-minute rate. CometChat covers the standard calling feature set well, at a higher per-minute cost.

Moderation

Both platforms offer AI-powered content detection, image moderation, customizable rules, and human-in-the-loop review workflows.

Where they differ:

• Stream offers AI Moderation as a standalone product covering text, images, and video streams — applicable across chat, video calls, and livestreaming. It can also be used independently of Stream's other products.

• CometChat builds moderation in as a chat feature included from the Basic tier, applied to messages and media shared within conversations.

Takeaway: This is a big gap for platforms where harmful content in live calls is a concern (think social apps, community platforms, or any product with user-generated video). For those use cases, Stream's moderation coverage is broader.

Activity Feeds

Stream offers Activity Feeds as a separate product for building social features like news feeds, notification streams, and follower graphs.

Takeaway: CometChat has no equivalent offering. If activity feeds are a core requirement, Stream is the only option between the two.

AI

Stream provides developer tools for embedding AI into communication experiences:

• AI Chatbot Integration: UI components and server-side integrations for OpenAI, Claude, Gemini, xAI, and custom LLMs, with support for Vercel AI SDK and LangChain

• Voice Agents: Real-time voice AI running on Stream's global edge network via WebRTC

• Vision Agents: Open-source framework for building low-latency voice and video AI applications

CometChat takes a managed platform approach with its Full-Stack AI Agent Platform:

• AI Agents & Copilots: Build and deploy user-facing conversational agents using natural language, with hosting, compliance, and analytics included

• Bring Your Own Agent: Plug existing AI logic into CometChat's agent chat infrastructure without rebuilding from scratch

Takeaway: Stream gives developers the tools to build AI-powered experiences; CometChat provides a managed platform to deploy them without custom infrastructure.

SDK & Developer Experience

Both platforms offer broad SDK coverage and open-source code, but they serve different developer profiles.

SDK Coverage

Takeaway: Stream is the only platform with Unity and Unreal Engine SDKs, a differentiator for gaming use cases.

CometChat covers more web and CMS frameworks: Vue, Ionic/Capacitor, WordPress, PHP, and Laravel, which is useful for teams building on existing web stacks rather than greenfield apps.

UI Components & Customization

Both platforms ship production-quality UI components with full theming support.

The differences:

Takeaway: Both platforms support deep customization. This isn't a capability gap. The question is where your team starts. Stream's components are an excellent foundation for frontend investment.

CometChat's components are closer to a finished product that can be deployed quickly and refined over time. Teams with strong frontend bandwidth and specific design requirements will likely prefer Stream's approach.

Teams optimizing for speed to production will find CometChat's UI kits cover more ground out of the box.

Scalability & Performance

Both platforms are built on global edge infrastructure and designed for production-grade scale.

The differences:

Takeaway: Both platforms are production-grade and built for scale.

Stream publishes more granular performance benchmarks and has a higher verified ceiling for concurrent users per channel (relevant for live events, large communities, or gaming).

CometChat's on-premise deployment option is a meaningful differentiator for teams with strict data residency requirements.

Pricing

Both platforms separate chat and voice/video into distinct billing lines.

The differences:

Chat & Messaging

Video & Voice

Takeaway: CometChat's entry plan is cheaper, but Stream's entry plan includes more (advanced moderation, 2B message records, offline support, and data export).

Stream's voice and audio rate is meaningfully lower than CometChat's, which is worth factoring in for call-heavy use cases.

Final Verdict: Which Should You Choose?

Both platforms are production-grade and well-supported. The right choice comes down to your team's priorities, technical resources, and scale requirements.

Choose Stream if:

• You need to support extreme scale. Stream's 5M concurrent users per channel benchmark is unmatched.
• Your team has engineering bandwidth to invest in building a custom, pixel-perfect UI.
• You need Unity or Unreal Engine SDKs for gaming use cases.
• Activity Feeds are a core product requirement; CometChat has no equivalent.
• You need AI moderation across chat, video, and livestreaming in a single product.
• Livestreaming is a requirement.
• You want to embed Voice Agents or LLM-powered chat directly into your communication experience.

Choose CometChat if:

• You need to ship fast; the no-code Widget Builder and low-code UI Kit Builder get you to production without engineering lift.
• Your team is early-stage and needs a lower entry price point that scales with MAU.
• On-premise deployment is a requirement for your data residency needs.
• You're building a managed AI agent experience and want hosting, compliance, and infrastructure included without custom plumbing.
• Your stack includes Vue, Ionic, WordPress, PHP, or Laravel — frameworks CometChat supports that Stream does not.

Considering the switch to Stream? Stream offers a proven two-step migration process. Enterprise customers get a free four-week migration guarantee with dedicated support.

Frequently Asked Questions

1. Is Stream better than CometChat?

It depends on your use case. Stream is the stronger choice for teams needing large scale, gaming SDKs, livestreaming, or AI-powered moderation across video and chat. CometChat is the stronger choice for teams that want faster time to production, lower entry pricing with less features, and a managed AI agent platform included out of the box.

2. How does Stream pricing compare to CometChat?

Stream's entry paid plan starts at $399/mo (billed annually) for 10,000 MAU and includes advanced moderation, offline support, and data export. CometChat's Basic plan starts at $299/mo and includes only core chat features. At the advanced tier, CometChat ($399/mo) includes HIPAA, AI moderation, and multi-tenancy, while Stream requires its $599/mo Elevate plan for the same features.

3. Which platform is best for large-scale apps?

Stream is built for the highest concurrency requirements, with a benchmark of 5 million concurrent users per channel and sub-40ms latency on its global edge network. CometChat has benchmarked 1 million concurrent connections, which is sufficient for many production use cases.

4. Does Stream offer a free plan?

Yes. Stream’s Build tier supports up to 1,000 MAU for chat. Stream Video also includes $100/mo in free credits on all accounts.

5. Which platform has better video calling, Stream or CometChat?

Both platforms offer production-ready video calling with adaptive quality, screen sharing, recording, and transcription. Stream publishes more granular performance benchmarks (0% packet loss, 4ms jitter, 225 Gbps peak traffic) and offers livestreaming as a distinct product. Stream's per-minute video rate is also lower. CometChat's video calling is included within its broader communication platform and supports a similar feature set for most standard use cases.

6. Which is easier to integrate, Stream or CometChat?

CometChat offers a wider range of integration paths, including a no-code Widget Builder that requires just a single line of code, making it accessible to teams without dedicated engineering resources. Stream is developer-first and requires some engineering work, but offers deeper low-level control.