21st Agents SDK vs Convai: Which is Better in 2026?
Choosing between 21st Agents SDK and Convai comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: 21st Agents SDK is our overall pick for developer tools workflows. Pick Convai if you need AI agents.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
21st Agents SDK
The fastest way to integrate AI agents with built-in UI and essential features into your applications.
Best for you if:
- • You need developer tools features specifically
- • Quickly integrate AI agents into applications.
- • Includes built-in UI, chat history, and spend limits.
Convai
Create and deploy intelligent, spatially aware conversational AI characters for virtual worlds and games.
Best for you if:
- • You want to try before committing
- • You need AI agents features specifically
- • Craft and deploy spatially 3D-aware conversational AI characters.
- • Enables lifelike virtual humans with natural language and realistic behaviors.
| At a Glance |  21st Agents SDK |  Convai |
|---|---|---|
Starts at | Custom | FreeFree tier available |
Best For | Developer Tools | AI Agents |
Rating | - | - |
Choose 21st Agents SDK or Convai?
Choose 21st Agents SDK if
The fastest way to integrate AI agents with built-in UI and essential features into your applications.
- Accelerates AI agent integration
- Provides essential features out-of-the-box
- Compatible with popular web technologies
- Your work is developer tools-shaped, not AI agents-shaped
Choose Convai if
Create and deploy intelligent, spatially aware conversational AI characters for virtual worlds and games.
- Enables highly immersive and interactive virtual experiences.
- Supports both no-code creation for creators and robust tools for developers.
- AI characters possess spatial intelligence and multimodal perception.
- You want a free tier before you commit
- Your work is AI agents-shaped, not developer tools-shaped
| Feature | 21st Agents SDK | Convai |
|---|---|---|
| Pricing Model | Paid | Freemium |
| User Rating | No ratings yet | No ratings yet |
| Categories | Developer ToolsAI Agents | AI AgentsNo-Code |
In-Depth Analysis
21st Agents SDK
The fastest way to integrate AI agents with built-in UI and essential features into your applications.
Strengths
- +Accelerates AI agent integration
- +Provides essential features out-of-the-box
- +Compatible with popular web technologies
- +Handles complex aspects like memory and tool use
Key features
Convai
Create and deploy intelligent, spatially aware conversational AI characters for virtual worlds and games.
Strengths
- +Enables highly immersive and interactive virtual experiences.
- +Supports both no-code creation for creators and robust tools for developers.
- +AI characters possess spatial intelligence and multimodal perception.
- +Integrates with leading game engines.
- +Rated #1 by developers for conversational AI.
Weaknesses
- -Pricing information is not publicly available on the website.
- -Specific features beyond high-level descriptions are not detailed.
Key features
Pricing: 21st Agents SDK vs Convai
| Plan | 21st Agents SDK | Convai |
|---|---|---|
| Tier 1 | N/A | Free Free |
| Tier 2 | N/A | $5/month Basic |
| Tier 3 | N/A | $15/month Pro |
Pricing verified from each vendor's public pricing page. Compare in detail on 21st Agents SDK pricing and Convai pricing.
Who Should Use What?
On a budget?
Convai has a free tier. 21st Agents SDK is paid only.
Go with: Convai
Want the highest-rated option?
Neither has ratings yet.
Too early to call on ratings — compare on features and pricing.
Value user reviews?
Neither has ratings yet.
Too early to call — neither has ratings yet.
3 Questions to Help You Decide
What's your budget?
21st Agents SDK is paid. Convai is freemium. Convai lets you start free.
What's your use case?
21st Agents SDK is a developer tools tool. Convai is in AI agents. Pick the category that matches your needs.
How important are ratings?
Neither has ratings yet.
Key Takeaways
21st Agents SDK
- Our pick for this comparison
Convai
- Has a free tier
- Better fit for AI agents
The Bottom Line
21st Agents SDK is our pick. Convai has a free tier if you want to test without paying.
Frequently Asked Questions
Is 21st Agents SDK or Convai better?
21st Agents SDK is rated in our evaluation. 21st Agents SDK is paid and Convai is freemium.
What are 21st Agents SDK and Convai used for?
21st Agents SDK: The fastest way to integrate AI agents with built-in UI and essential features into your applications.. Convai: Create and deploy intelligent, spatially aware conversational AI characters for virtual worlds and games..
What does 21st Agents SDK cost vs Convai?
21st Agents SDK is a paid tool. Convai is freemium (free tier + paid plans). Visit their websites for detailed pricing.