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 wins this matchup. Our overall AI Agents pick is UiPath. Our free AI Agents pick is Prefactor. 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 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 | FreeFree tier available | FreeFree tier available |
Best For | Developer Tools | AI Agents |
Rating | - | - |
Free plan | Yes | Yes |
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.
- Your work is AI agents-shaped, not developer tools-shaped
| Feature | 21st Agents SDK | Convai |
|---|---|---|
| Pricing Model | Freemium | 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.
21st.dev publishes yearly list prices: Builder $6/month, Builder + AI $15/month, Team $7.50/seat/month (2–50 seats).
Watch out
These $ are billed yearly. The page says save 25% vs quarterly.
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.
Convai's pricing is quite generous, especially with a robust Free tier and an affordable Basic plan at $5/month.
Watch out
Potential overage fees for exceeding storage limits.
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.
Key features
Pricing: 21st Agents SDK vs Convai
| Plan | 21st Agents SDK | Convai |
|---|---|---|
| Tier 1 | $6 month Builder | Free Free |
| Tier 2 | $15 month Builder + AI | $5/month Basic |
| Tier 3 | $7.5 month Team | $15/month Pro |
| Tier 4 | $5 / 100 credits Extra AI credits | N/A |
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?
Both are freemium. Compare plans on their websites.
Go with: 21st Agents SDK
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?
Both are freemium. Pricing won't help you decide here.
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
- Free tier available
- Our pick for this comparison
Convai
- Better fit for AI agents
The Bottom Line
21st Agents SDK wins this matchup. Our overall AI Agents pick is UiPath. Our free AI Agents pick is Prefactor.
Frequently Asked Questions
Is 21st Agents SDK or Convai better?
21st Agents SDK is rated in our evaluation. Both are 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 freemium (free tier + paid plans). Convai is freemium (free tier + paid plans). Visit their websites for detailed pricing.