21st Agents SDK vs Convai: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for 21st Agents SDK and Convai side by side. This page compares data; it is not a hands-on review.
On the data: On the data below, Convai leads on lower entry price. We do not name an overall winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, 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 want accelerates AI agent integration
Convai
Create and deploy intelligent, spatially aware conversational AI characters for virtual worlds and games.
Best for you if:
- • You want enables highly immersive and interactive virtual experiences
| At a Glance | 21st Agents SDK | Convai |
|---|---|---|
Starts at | Free plan, paid from $6/mo, billed monthly Builder plan | Free plan, paid from $5/mo, billed monthly Basic plan |
Category | AI Agents Developer Tools | AI Agents No-Code |
Rating | n/a | n/a |
Free plan | Yes | Yes |
Watch out for | These $ are billed yearly. The page says save 25% vs quarterly. | Potential overage fees for exceeding storage limits. |
Choose 21st Agents SDK or Convai?
Choose 21st Agents SDK if
- You want accelerates AI agent integration
- You want provides essential features out-of-the-box
Choose Convai if
- You want enables highly immersive and interactive virtual experiences
- You want supports both no-code creation for creators and robust tools for developers
- Budget matters ($5/mo, billed monthly vs $6/mo, billed monthly)
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
- Pro: Accelerates AI agent integration
- Pro: Provides essential features out-of-the-box
- Pro: Compatible with popular web technologies
- Pro: 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
- Pro: Enables highly immersive and interactive virtual experiences.
- Pro: Supports both no-code creation for creators and robust tools for developers.
- Pro: AI characters possess spatial intelligence and multimodal perception.
- Pro: Integrates with leading game engines.
- Pro: Rated #1 by developers for conversational AI.
Weaknesses
- Con: Pricing information is not publicly available on the website.
Key features
Plans and prices: 21st Agents SDK vs Convai
| Tool | Plans and prices | Source |
|---|---|---|
| 21st Agents SDK |
| 21st.dev/pricing read Oct 23, 2026 |
| Convai |
| convai.com/pricing read Oct 8, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on 21st Agents SDK pricing and Convai pricing.
Key Takeaways
21st Agents SDK
- Choose if you want the fastest way to integrate AI agents with built-in UI and essential features into your applications
Convai
- Lower entry price: $5/mo, billed monthly vs $6/mo, billed monthly
What the data shows
On the data below, Convai leads on lower entry price. We do not name an overall winner for this pair.
- Convai has the lower entry price: $5/mo, billed monthly (Basic) against $6/mo, billed monthly (Builder) for 21st Agents SDK.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do 21st Agents SDK and Convai compare in 2026?
On the data below, Convai leads on lower entry price. We do not name an overall winner for this pair. Convai has the lower entry price: $5/mo, billed monthly (Basic) against $6/mo, billed monthly (Builder) for 21st Agents SDK. Both have a free plan.
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's cheapest paid plan is Builder at $6/mo, billed monthly; it also has a free plan. Convai's cheapest paid plan is Basic at $5/mo, billed monthly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Oct 23, 2026.
What's the main difference between 21st Agents SDK and Convai?
21st Agents SDK's main strength: accelerates AI agent integration. Convai's main strength: enables highly immersive and interactive virtual experiences.