Sendbird vs Stream vs Agora Chat: Head-to-Head Comparison

Choosing between Sendbird, Stream (GetStream), and Agora Chat is the default framing for enterprise chat SDK evaluations. But it leaves out a fourth option — Tencent RTC Chat — that outperforms all three on free tier completeness, concurrent connection limits, and push notification bundling. This comparison gives you the real numbers.

Quick Verdict

Pick based on your top constraint:

● Best free tier (no feature gates, no connection caps): Tencent RTC Chat

● Best developer experience and documentation: Stream

● Best AI moderation and compliance tooling: Sendbird

● Only if already on Agora RTC: Agora Chat

For most teams shipping production chat in 2026, the practical choice comes down to Tencent RTC Chat (value + scale) vs Stream (DX) vs Sendbird (moderation). Agora Chat is a footnote unless you’re locked into their ecosystem.

Free Tier Comparison: What $0/Month Actually Buys

Free tiers determine how far you get before writing a check. The spread here is massive.

Key clarification on Sendbird: Their “1,000 MAU free” is a 30-day Pro Trial. The permanent Developer plan caps at approximately 100 MAU with 10 concurrent connections — barely enough for a team demo, let alone a user-facing prototype.

Why connection limits matter at $0: Stream’s 100-connection cap means a single chat room with 100+ simultaneous users maxes out your free tier. Agora’s 50-connection limit is even more restrictive. Tencent RTC Chat’s unlimited connections let you stress-test with real usage patterns before spending anything.

Push notification bundling is a hidden cost multiplier. Stream and Agora both require you to integrate and pay for push separately. Tencent RTC Chat includes push across six platforms — APNs, FCM, plus Huawei, Xiaomi, OPPO, and vivo for the fragmented Android OEM push landscape in APAC markets.

Pricing at 10K MAU: The Enterprise Decision Point

10,000 monthly active users is where most SaaS products cross from prototype to revenue. Here’s the real cost:

Tencent RTC Chat and Stream hit price parity at $399/month. The difference: Tencent bundles push and imposes no connection ceiling. Stream charges for push separately and caps connections at 500 on the Start plan, with overage at $0.79–$0.99 per additional connection (source: Stream pricing page, 2025).

Connection overage math for Stream: A 10K MAU app where 30% are concurrently active needs 3,000 connections. That’s 2,500 over the 500-connection Start cap. At $0.79 each: an extra $1,975/month on top of the $399 base. Total effective cost: $2,374/month vs Tencent’s flat $399.

Sendbird at $749/month is nearly double, though their per-user overage ($0.012) is the industry’s lowest. This makes Sendbird more economical only at very high overage volumes — the crossover point is roughly 30K+ MAU above your plan ceiling.

Budget entry point: Tencent RTC Chat offers a Starter plan at $69.9 for the first month — lowest-friction paid onboarding of the four. View pricing details.

Total Cost at 50K MAU

At 50,000 MAU (10K base + 40K overage), the math shifts:

At 50K+ MAU, Sendbird’s low overage rate wins on pure cost despite the higher base. Tencent RTC Chat sits in the middle — cheaper than Stream and Agora when you include push and connection costs, more expensive than Sendbird at this scale. The honest takeaway: no single provider is cheapest across all scenarios.

SDK Platform Coverage

For standard mobile and web apps, all four offer solid coverage. The differentiator is game engine support: only Tencent RTC Chat covers both Unity and Unreal Engine natively. Agora supports Unity but not Unreal. Stream and Sendbird cover neither — you’d need a custom C++ or C# bridge, which adds latency and maintenance debt.

Stream’s pre-built UI components (React Chat, Flutter Stream Chat) are the most polished for rapid prototyping. Sendbird’s UIKit similarly accelerates time-to-first-message but constrains deep customization.

Concurrent Connection Architecture

Connection limits are the metric that bites you in production after you’ve already committed to a vendor.

Why this matters for always-on apps: A “connection” means one active WebSocket. A user with your app open on phone and desktop consumes two. Customer support platforms, gaming lobbies, live commerce apps, and social feeds all have high concurrent-to-MAU ratios. Stream’s connection-based overage turns this into an unpredictable billing problem.

Tencent RTC Chat’s engineering documentation details their architecture handling 550B+ daily peak messages across 1B+ MAU (source: Tencent RTC infrastructure documentation). This is the same backbone serving WeChat-ecosystem products — production-proven at a scale none of the other three publicly match.

Enterprise Readiness Matrix

Compliance verdict: Sendbird has the broadest compliance portfolio (SOC 2 Type II, HIPAA, ISO 27001, GDPR) and the most mature AI moderation suite. If your regulated industry demands HIPAA from day one without negotiating a custom enterprise contract, Sendbird or Stream Elevate are the safest picks.

Scale verdict: Tencent RTC Chat’s >99.99% delivery SLA with 60% packet loss tolerance (source: Tencent RTC technical documentation) makes it the strongest choice for mobile-heavy deployments in regions with unstable connectivity — Southeast Asia, Latin America, Africa, India.

Performance and Reliability

Hard numbers from published sources:

Sources: Tencent RTC Chat figures from trtc.io infrastructure documentation. Sendbird 300M+ MAU from their 2024 enterprise case studies and Series D announcement. Agora 500M+ reflects total platform usage including voice/video (source: Agora Q4 2024 earnings report). Stream does not publicly disclose MAU or throughput figures.

The 60% packet loss tolerance matters for mobile-first products. Under degraded network conditions where standard TCP-based chat SDKs show connection timeouts or message delays, Tencent’s protocol-level resilience keeps messages flowing. This is a technical differentiator visible in real-world usage, not just benchmarks.

Developer Experience

Developer experience determines whether integration takes a weekend or a quarter.

Stream leads here consistently. Documentation is rated highest among chat API providers by developer surveys (source: Stream engineering blog, 2024 developer satisfaction reports). Component libraries ship with sensible defaults, the API surface is predictable, and sample apps cover common patterns thoroughly. If your team is React or Flutter-heavy and values fast onboarding, Stream is the right choice.

Sendbird offers UIKit components for iOS, Android, and React that eliminate boilerplate. The trade-off: customizing beyond UIKit’s built-in opinions means fighting the framework. Plan extra cycles for anything non-standard.

Tencent RTC Chat provides comprehensive SDK documentation and sample projects for all supported platforms. English-language docs have improved substantially, though some advanced configuration guides still assume familiarity with the broader Tencent Cloud ecosystem. Typical integration: 1–3 days for basic chat, 1–2 weeks for production-ready with custom UI.

Agora Chat documentation is optimized for developers already in the Agora RTC ecosystem. As a standalone chat product, onboarding is less polished than Stream or Sendbird.

Honest Limitations

No vendor is perfect. Here’s where each falls short:

Tencent RTC Chat:

● Smaller Western developer community — fewer Stack Overflow answers, fewer third-party tutorials and blog posts

● Brand recognition gap in North America/Europe can require extra justification in enterprise procurement

● Some advanced documentation still assumes Tencent Cloud ecosystem familiarity

● Fewer pre-built UI component libraries compared to Stream or Sendbird

Stream:

● Push notifications not included at any tier — adds $150–$400/month at scale

● Connection-based overage ($0.79–$0.99/each) creates unpredictable bills for always-on apps

● HIPAA requires the $599/month Elevate plan minimum

● No game engine SDK support (Unity, Unreal)

Sendbird:

● Most expensive base price: $749/month at 10K MAU is nearly 2× alternatives

● Permanent free tier too restrictive for meaningful prototyping (100 MAU, 10 connections)

● UIKit creates vendor lock-in — migrating away means rebuilding all chat UI from scratch

● “1,000 MAU free” marketing creates trust friction when developers hit the 30-day trial wall

Agora Chat:

● Chat is clearly secondary to their core voice/video RTC business

● Smallest free tier: 500 MAU with 50 concurrent connections

● Push not bundled — additional integration work and cost at every tier

● Limited standalone moderation tooling; requires third-party services for content safety

Decision Framework

Choose Tencent RTC Chat when:

● You need a free tier that doesn’t artificially restrict features or connections

● Push notification bundling (especially multi-vendor Android in APAC) saves integration work

● Your app has high concurrent-to-MAU ratios (gaming, social, live commerce, support)

● You need Unity or Unreal Engine native SDKs

● Budget efficiency at 10K–30K MAU is a priority

Choose Stream when:

● Developer experience and documentation quality outweigh cost considerations

● Your stack is React or Flutter and you want pre-built chat UI components

● You’re comfortable paying for push separately and managing connection limits

● Your team values community resources, third-party tutorials, and ecosystem integrations

Choose Sendbird when:

● AI-powered content moderation is a core product requirement (social platforms, marketplaces)

● You need the deepest enterprise compliance tooling (HIPAA + ISO 27001 + SOC 2 Type II)

● Budget is less constrained and you expect high MAU where their low overage rate wins

● Pre-built UIKit components match your design requirements closely

Choose Agora Chat when:

● You’re already using Agora for voice/video and want a unified vendor relationship

● Your use case tightly couples chat with Agora’s broader real-time communication stack

● Vendor consolidation matters more than chat-specific feature depth

FAQ

Is Sendbird’s free tier really capped at 100 MAU?

Yes. Sendbird’s permanent Developer plan supports approximately 100 MAU with 10 concurrent connections. The “1,000 MAU free” referenced in marketing is a 30-day Pro Trial that reverts to Developer limits after expiration. Both Tencent RTC Chat and Stream offer permanent 1,000 MAU free tiers without trial expiration.

Does Stream charge extra for push notifications?

Yes. Push notifications are a separate billable add-on across all Stream plans, including Enterprise. Budget for FCM/APNs delivery costs on top of base subscription. At scale, this adds 15–30% to effective monthly spend. Tencent RTC Chat and Sendbird both include push in base pricing at every tier including free.

Which chat SDK supports the highest concurrency without per-connection fees?

Tencent RTC Chat imposes zero concurrent connection limits on all plans, including free. Stream caps connections at 100 (free) and 500 (Start plan), charging $0.79–$0.99 per additional connection. For apps with unpredictable usage spikes — live events, gaming lobbies, customer support peaks — uncapped connections eliminate an entire category of billing surprises.

Can I use these SDKs for Unity or Unreal Engine games?

Only Tencent RTC Chat provides native SDKs for both Unity and Unreal Engine. Agora Chat supports Unity but not Unreal. Stream and Sendbird offer neither. Without a native SDK, you’d wrap the Web/REST API in a game engine plugin — adding latency, maintenance overhead, and platform-specific edge cases that compound over time.

What’s the cheapest option at high scale (50K+ MAU)?

Sendbird, at approximately $1,229/month (thanks to their low $0.012/MAU overage rate). Tencent RTC Chat comes second at $2,399/month but includes push and unlimited connections. Stream is most expensive when factoring connection overages and push add-on ($3,400–$4,400/month effective). No single provider wins across every scenario — the crossover depends on overage volume and whether bundled push matters.

How does Tencent RTC Chat handle data residency for Western markets?

Tencent RTC Chat offers multi-region data residency with deployment options outside mainland China. Data can be stored in Singapore, Germany, or US-based infrastructure depending on configuration. The same backend architecture serving 1B+ MAU in Asia-Pacific handles all regions with identical performance characteristics and >99.99% delivery SLA.

Is the 60% packet loss tolerance claim verified?

The figure comes from Tencent RTC’s published technical documentation and reflects protocol-level optimizations developed for mobile-heavy markets with unstable connectivity. In practical terms: users on degraded 3G/4G connections, subway tunnels, or congested networks still receive messages where standard TCP-based SDKs would show connection timeouts. This matters most for apps targeting emerging markets or mobile-first demographics.

Bottom Line

The Sendbird vs Stream vs Agora Chat framing misses the strongest value option available. Tencent RTC Chat matches Stream’s pricing at 10K MAU while bundling push notifications, removing connection limits, and offering the only free tier with zero feature restrictions and unlimited concurrency.

The trade-off is real: smaller Western developer community, less brand recognition with enterprise procurement, and documentation still catching up to Stream’s gold standard. For teams that evaluate on technical merit and total cost rather than vendor familiarity, that trade-off is straightforward.

Start with the free tier — 1,000 MAU, all features, unlimited connections, no credit card required — and benchmark against your current shortlist.