ZEGOCLOUD vs Sendbird vs Stream for In-App Communities and Channels

If you are building a Discord-style product — a space where users join a community and then talk inside several named channels — a generic group-chat API is not quite enough. You need a data model that groups multiple conversations under one membership boundary, member management that scales to tens of thousands, moderation primitives, and a client SDK on every platform you ship.

This guide compares four chat APIs that regularly come up in community builds — ZEGOCLOUD (ZIM), Sendbird, Stream, and CometChat — specifically on community and channel capabilities. It is not a generic “best chat API” list; the focus is the feature set a community product actually uses: community/channel structure, member management and moderation, SDK coverage, and whether voice, video, and live streaming come from the same vendor.

How these four model a “community”

The most important difference is architectural: whether the vendor gives you a native parent container that holds many channels, or expects you to assemble that topology yourself.

• ZEGOCLOUD ZIM has a first-class Community object with a three-tier Community–Channel–Thread structure (mapped to Discord’s Server–Channel–Thread). Members join the community once and participate in its channels. The Thread tier is documented as planned for a future version and is not generally available yet.
• Sendbird organizes traffic into open channels and group channels, with Supergroup channels for large member-based rooms and dynamic partitioning (subchannels) for very large open channels. There is no single “server” container that natively bundles a set of channels under one membership; large public rooms and large member rooms are solved as scaled channel types rather than a parent community object.
• Stream builds everything on channels typed by a configurable channel type (messaging, team, livestream, gaming, commerce, plus custom types). It supports threads, roles, and public livestream-style channels, but a Discord-style “server containing channels” is typically modeled with your own IDs/metadata rather than a dedicated community entity.
• CometChat models conversations with Groups (public, private, password). It has no native community-or-channel resource; a channel is a group, and grouping channels into a community is done with group tags/metadata and membership synced per group in your backend.

In short: only ZIM exposes the community itself as a native object with channels nested underneath. The messaging specialists solve scale and room types well, but the “server with many channels” topology is partly yours to design.

Feature-by-feature comparison

Limits above are the documented defaults at the time of writing and can vary by plan; confirm the current numbers in each vendor’s documentation before you commit to a capacity plan.

Member management and moderation

All four provide the basics — roles, member removal, and muting or banning — but they expose it at different levels.

ZIM’s community APIs operate directly on the community and its channels. You can invite users in bulk, kick members, change roles, transfer ownership, and query members. Roles are owner (1), admin (2), and regular member (3). Muting is notably flexible: a member can be muted in one channel or across all channels, for a timed duration or permanently, while a user can also mute channels client-side. Community-wide global muting of an entire space is not yet supported; current mute operations target channels or members.

Sendbird ships the broadest out-of-the-box moderation surface — mute, timed/permanent bans, channel freeze, profanity and domain filters, image moderation, and a reporting API — which matters for user-generated community traffic. Stream offers custom roles and permission policies plus timed, shadow, and IP bans and a flag/review queue. CometChat separates in-channel scope (admin/moderator/participant) from app-wide roles and adds a dedicated moderation API.

Platform coverage

For community products that ship broadly, native client SDK coverage reduces integration work. ZIM’s community feature (SDK 3.0.0 or later) is documented across Android, iOS, macOS, Windows, and React Native (with Web and Flutter also covered in the documentation set). Sendbird has the widest envelope for game and desktop engines (Unity, Unreal, .NET) alongside the standard mobile and web SDKs. Stream and CometChat cover the mainstream mobile/web/Flutter/RN set and provide multiple server-side SDKs.

One vendor for chat plus real-time media

This is where the messaging-specialist model and a real-time-platform model diverge. Community products increasingly layer voice rooms, co-watching video, and live events onto text chat.

ZEGOCLOUD’s core business is real-time media: in-app chat (ZIM) shares a platform with ZEGOCLOUD’s real-time voice/video and live-streaming stack, so community text, channels, voice, and live can run under one account, one identity model, and one vendor relationship. Sendbird and Stream are messaging-first and provide voice/video through distinct products (Sendbird Calls/Live; Stream Video), which are capable but are integrated and often contracted as separate surfaces rather than a single real-time-media core. CometChat bundles calling within its own product surface. If consolidating chat with voice and live is a primary goal, a single real-time platform removes a cross-vendor integration; if messaging depth is the priority and media is a small add-on, a specialist can be the better fit.

Short pros and cons

• ZEGOCLOUD ZIM — Pros: native community-with-channels model, 100k-member communities, flexible per-channel/all-channel member muting, and voice/video/live from the same vendor. Cons: Community is a premium feature requiring activation; the Thread tier is not yet available; the ecosystem and third-party extension catalog are younger than the messaging specialists’.
• Sendbird — Pros: deepest mature messaging and moderation feature set, proven large-room options (Supergroups, partitioning), broad SDK/engine coverage. Cons: no native parent-community container; group channels cap at 100 members; MAU pricing rises with scale; media is a separate product.
• Stream — Pros: highly configurable channel types, strong roles/permissions, good developer experience and server SDKs. Cons: a Discord-style server is mostly your own modeling; custom-type caps; media is a separate Stream product; advanced moderation (AI) is premium.
• CometChat — Pros: simple groups-as-channels model, built-in scopes and moderation, calling bundled. Cons: no native community/channel hierarchy (you build it with tags/metadata and sync membership yourself); read receipts/typing/unread indicators only fully work up to 300 members per group.

Key takeaways

• Pick a messaging specialist (Sendbird, Stream, or CometChat) when text-chat depth, mature moderation, and a large prebuilt feature catalog matter most, and you are comfortable modeling (or don’t need) a Discord-style parent community.
• Pick ZEGOCLOUD ZIM when you want the community-and-channels structure as a native object, expect very large communities, and want voice, video, and live streaming from the same platform rather than a second vendor.
• Decide your topology early. A native community container (ZIM) handles membership and channels in one place; with groups/channels as flat primitives (Stream, CometChat, and largely Sendbird), your backend owns the parent-child relationships and membership propagation.
• Validate limits and tier gating in current docs — member caps, channel caps, and which features require a paid plan or activation all differ.

FAQ

Which chat API is best for building communities?

It depends on whether you need messaging-only depth (Sendbird, Stream, CometChat) or want to consolidate community chat with voice, video, and live streaming on one platform (ZEGOCLOUD). ZIM is also the only one of the four with a native community object that contains channels.

Does ZEGOCLOUD support channels like Discord?

Yes. A ZIM community contains channels that carry their own messages and conversations, including public and private channels. The Community–Channel structure was added in ZIM SDK 3.0.0, and the Thread tier is planned for a future version.

Can I moderate communities across these platforms?

All four offer moderation primitives. ZIM provides member role management, bulk kick, and per-channel or all-channel member muting; richer content moderation (profanity, image, reporting) is available on Sendbird, Stream, and CometChat and can be layered onto ZIM server-side.

What platforms does ZIM community support?

ZIM community features are documented for Android, iOS, macOS, Windows, and React Native (Web and Flutter are also covered), and require ZIM SDK 3.0.0 or later. Community is a premium feature that must be activated by ZEGOCLOUD support.

Explore further

• In-app Chat (ZIM) product overview
• ZIM Community developer documentation

If your product roadmap pairs large text communities with voice rooms or live events, evaluate ZIM’s native community model alongside its real-time media stack rather than stitching two vendors after launch. Read more about building in-app communities with ZEGOCLOUD.