kitio.ai21st.dev vs Theneo
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. 21st.dev starts at See pricing page and Theneo starts at $150/mo. Check both pricing pages for current plans.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Component library
- Magic MCP server
- UI variation generation
- Agent-ready prompts
- shadcn compatibility
- Docs generated from API specs
- Ask AI for readers
- Breaking-change changelogs
- Real-time co-editing
- MCP server and llms.txt
- Private developer portals
| Feature | 21st.dev | Theneo |
|---|---|---|
| Best for | UI component library and MCP tools for AI coding agents | AI-generated API docs and developer portals with Ask AI |
| Category | Coding | Coding |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | $150/mo |
| Free plan | Yes | Yes |
| Made by | 21st.dev | Theneo |
| Based in | – | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
21st.dev starts at See pricing page and Theneo starts at $150/mo. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Free
Free
- Browse the whole library
- 2 component copies a day
Builder
$8/mo billed quarterly
- Unlimited copies and installs
- Unlimited shaders and gradients
Builder + AI
$20/mo billed quarterly
- 500 AI credits/month
- Design Bug Bot PR reviews
- Premium AI models
Team
$10/seat/mo billed quarterly
- Per seat, 2 to 50 seats
- Shared collections
- Private team components
- Admin controls
4 plans
Starter
Free
- 1 public and 2 private projects
- Up to 20 team members
- 100 AI search results
Business
$150/mo
- Per workspace, $120 billed yearly
- Up to 7 projects
- Unlimited AI search
- Custom branding and SEO
Growth
$450/mo
- Per workspace, $400 billed yearly
- Custom CSS and AI prompts
- Up to 20 developer portals
Enterprise
Contact sales
- Unlimited projects
- Self hosting
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
21st.dev
- Improves AI-generated UI quality
- Works with major coding agents
- Large free catalog
- React and Tailwind only
- Magic usage is paid
Theneo
- Free starter plan
- Docs ready for AI agents
- Writers and engineers edit together
- Paid plans are priced per workspace
- Big jump from free to Business
- Custom CSS only on Growth
Which one should you choose?
Choose 21st.dev if you want:
- Improves AI-generated UI quality
- Works with major coding agents
- Large free catalog
Watch out: react and tailwind only.
Choose Theneo if you want:
- Free starter plan
- Docs ready for AI agents
- Writers and engineers edit together
Watch out: paid plans are priced per workspace.
21st.dev vs Theneo FAQ
What is the difference between 21st.dev and Theneo?
21st.dev: UI component library and MCP tools for AI coding agents. Theneo: AI-generated API docs and developer portals with Ask AI. Both are coding tools.
Is 21st.dev or Theneo cheaper?
21st.dev starts at See pricing page and Theneo starts at $150/mo. Check both pricing pages for current plans.
Do 21st.dev and Theneo have free plans?
21st.dev: Yes. Theneo: Yes.
Who makes 21st.dev?
21st.dev is made by 21st.dev.
Who makes Theneo?
Theneo is made by Theneo, based in United States.
Which should I choose, 21st.dev or Theneo?
Choose 21st.dev if you value improves ai-generated ui quality and works with major coding agents. Choose Theneo if you value free starter plan and docs ready for ai agents.