Best Chat21 Alternatives in 2026
The top Chat21 alternatives are Twilio Conversations, Sendbird Chat and Stream Chat: 15 chat api our editors would look at instead of Chat21, in our ranking order.
Chat21: A self-hosted Firebase chat SDK for teams building basic mobile and web messaging. Where it falls short: firebase is the documented backend and integration.
Switching from Chat21? For most chat api buyers the best Chat21 alternative is Twilio Conversations, built for teams building chat plus SMS and messaging channels. On a budget, Ably Chat starts at $29/mo. Tinode offers the most group size limit (128 members).
Why People Look for a Chat21 Alternative
- Firebase is the documented backend and integration
- Self-hosted deployment requires backend installation and operation
- AGPLv3 licensing may require a commercial licence for some use cases
Quick Picks by What You Need
- Best overallTwilio Conversations9.2
Teams building chat plus SMS and messaging channels
Visit Twilio Conversations - Lowest priceAbly Chat8.2
Paid plans from $29/mo
Visit Ably Chat - Best free optionTwilio Conversations9.2
Has a free plan
Visit Twilio Conversations - Most group size limitTinode7.8
128 members
Visit Tinode
All 15 Chat21 Alternatives, Ranked
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
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Best forTeams building chat plus SMS and messaging channels
- Better than Chat21:
- Editor score 9.2 vs 7.0
A developer-focused messaging API spanning chat, SMS, MMS, WhatsApp, and Messenger.
- Moderation tools
9.2/10★★★★★Visit Twilio -
Best forTeams building chat into web, mobile, or game apps
- Better than Chat21:
- Editor score 8.8 vs 7.0
A feature-rich chat API for teams that can accommodate paid plans starting at $349 per month.
- Moderation tools
8.8/10★★★★☆Visit Sendbird -
Best forTeams seeking broad SDK coverage and moderation
- Better than Chat21:
- Editor score 8.7 vs 7.0
Broad chat features and SDK coverage, with paid plans starting at $399 per month billed annually.
- Moderation tools
8.7/10★★★★☆Visit Stream Chat -
Best forBusinesses building cross-channel messaging bots
- Better than Chat21:
- Editor score 8.6 vs 7.0
Build AI-assisted chatbot journeys and deploy them across messaging channels.
8.6/10★★★★☆Visit Gupshup -
Best forTeams adding custom chat across app platforms
- Better than Chat21:
- Editor score 8.4 vs 7.0
A flexible chat SDK with broad conversation tools and a free entry plan.
- Moderation tools
8.4/10★★★★☆Visit PubNub -
Best forApps needing rich media and large-community chat
- Better than Chat21:
- Editor score 8.3 vs 7.0
A media-rich chat SDK with community messaging, moderation, and usage-based plans.
- Moderation tools
8.3/10★★★★☆Visit Agora Chat -
Best forDevelopers adding realtime chat to apps
- Better than Chat21:
- Editor score 8.2 vs 7.0
A developer-focused chat API with core messaging features and a free entry tier.
- Moderation tools
8.2/10★★★★☆Visit Ably Chat -
Best forTeams self-hosting scalable, open-source chat
- Better than Chat21:
- Editor score 7.9 vs 7.0
A self-hosted chat API with broad SDK coverage and support for groups up to 100,000.
- Moderation tools
7.9/10★★★★☆Visit OpenIM -
Best forTeams wanting open-source cloud or self-hosted messaging
- Better than Chat21:
- Editor score 7.8 vs 7.0
A flexible chat foundation for teams that can work within its group-topic limits.
- Self-hosted option
- Group chat
- Moderation tools
7.8/10★★★★☆Visit Tinode -
Best forTeams building self-hosted chat for desktop and mobile
- Better than Chat21:
- Editor score 7.7 vs 7.0
A self-hosted chat backend with broad messaging features and flexible transport options.
- Moderation tools
7.7/10★★★★☆Visit PrivChat -
Best forTeams needing self-hosting plus chat and calling
- Better than Chat21:
- Editor score 7.6 vs 7.0
A broad real-time communications API with a free non-commercial plan and a $49 monthly production minimum.
- Moderation tools
7.6/10★★★★☆Visit mesibo -
Best forApps needing multimedia chat across mobile and desktop
- Better than Chat21:
- Editor score 7.5 vs 7.0
Multimedia chat for mobile and desktop, with a free plan and paid tiers from $99/month.
- Moderation tools
7.5/10★★★★☆Visit ZEGOCLOUD -
Best forTeams wanting a conventional chat API with moderation
- Better than Chat21:
- Editor score 7.4 vs 7.0
A conventional chat API with broad messaging features and moderation, from $107 per month.
- Moderation tools
7.4/10★★★★☆Visit QuickBlox -
Best forTeams wanting chat, calling, and built-in moderation
- Better than Chat21:
- Editor score 7.3 vs 7.0
Broad chat and calling APIs with moderation, but free use is capped at 100 users.
- Moderation tools
7.3/10★★★★☆Visit CometChat -
Best forTeams building open-source chat with admin controls
- Better than Chat21:
- Editor score 7.2 vs 7.0
A broad SDK and API toolkit for teams embedding chat with moderation controls.
- Moderation tools
7.2/10★★★★☆Visit JuggleIM
Chat21 Alternatives: Common Questions
What is the best alternative to Chat21?
Twilio Conversations: #1 in our Chat Api ranking, with an editor score of 9.2 out of 10. A developer-focused messaging API spanning chat, SMS, MMS, WhatsApp, and Messenger.
Is there a free alternative to Chat21?
Yes. Twilio Conversations, Stream Chat, PubNub Chat, Agora Chat and Ably Chat have a free plan or a free tier (13 of the 15 alternatives on this page).
What is the cheapest paid alternative to Chat21?
Of the alternatives here that publish a price, Ably Chat starts lowest, at $29/mo.
Why do people look for Chat21 alternatives?
Firebase is the documented backend and integration; Self-hosted deployment requires backend installation and operation; AGPLv3 licensing may require a commercial licence for some use cases.
Which Chat21 alternative has the most group size limit?
Tinode, with 128 members.
How do I switch from Chat21?
Export your data from Chat21 (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel Chat21.
How to Switch from Chat21
- Export your data from Chat21 (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel Chat21.
Chat21 vs Each Alternative
| # | Tool | Free plan | Paid from | Moderation tools | Score |
|---|---|---|---|---|---|
| 17 | Chat21 | Yes | Free | 7.0 | |
| 1 | Twilio Conversations | Yes | Yes | 9.2 | |
| 2 | Sendbird Chat | No | $349/mo | Yes | 8.8 |
| 3 | Stream Chat | Yes | Yes | 8.7 | |
| 4 | Gupshup | No | $0.001/unit usage-based | 8.6 | |
| 5 | PubNub Chat | Yes | $98/mo | Yes | 8.4 |
| 6 | Agora Chat | Yes | $349/mo | Yes | 8.3 |
| 7 | Ably Chat | Yes | $29/mo | Yes | 8.2 |
| 8 | OpenIM | Yes | Free | Yes | 7.9 |
| 9 | Tinode | Yes | Yes | 7.8 | |
| 10 | PrivChat | Yes | Free | Yes | 7.7 |
| 11 | mesibo | Yes | $49/mo | Yes | 7.6 |
| 12 | ZEGOCLOUD In-app Chat | Yes | $99/mo | Yes | 7.5 |
| 13 | QuickBlox Chat API | Yes | Yes | 7.4 | |
| 14 | CometChat | Yes | Yes | 7.3 | |
| 15 | JuggleIM | Free | Yes | 7.2 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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