kitio.ai21st.dev vs MySpec
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 MySpec starts at See pricing page. 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
- Structured spec interview
- Four-file spec bundle
- Acceptance criteria
- Mermaid diagrams
- MCP handoff
- Greenfield and brownfield projects
| Feature | 21st.dev | MySpec |
|---|---|---|
| Best for | UI component library and MCP tools for AI coding agents | AI interviewer that writes a four-file spec for coding agents |
| Category | Coding | Coding |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | See pricing page |
| Free plan | Yes | Yes |
| Made by | 21st.dev | MySpec |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
21st.dev starts at See pricing page and MySpec starts at See pricing page. 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
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
MySpec
- Gives coding agents clearer context
- Versioned spec changes
- Works for new and existing codebases
- Open beta pricing may change
- Claims about fewer bugs are unverified
- Adds a planning step before coding
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 MySpec if you want:
- Gives coding agents clearer context
- Versioned spec changes
- Works for new and existing codebases
Watch out: open beta pricing may change.
21st.dev vs MySpec FAQ
What is the difference between 21st.dev and MySpec?
21st.dev: UI component library and MCP tools for AI coding agents. MySpec: AI interviewer that writes a four-file spec for coding agents. Both are coding tools.
Is 21st.dev or MySpec cheaper?
21st.dev starts at See pricing page and MySpec starts at See pricing page. Check both pricing pages for current plans.
Do 21st.dev and MySpec have free plans?
21st.dev: Yes. MySpec: Yes.
Who makes 21st.dev?
21st.dev is made by 21st.dev.
Who makes MySpec?
MySpec is made by MySpec.
Which should I choose, 21st.dev or MySpec?
Choose 21st.dev if you value improves ai-generated ui quality and works with major coding agents. Choose MySpec if you value gives coding agents clearer context and versioned spec changes.