21st.dev
Create, remix and share UI components with AI
Alta AI
Build an AI Chatbot with Google Drive and Slack in Minutes
Updated June 2026
| 21st.dev | Alta AI | |
|---|---|---|
| Rating | 5.0★ | 5.0★ |
| Reviews | 6 | 7 |
| Pros | 6 | 13 |
| FactScore™ | 42.3 | 45.2 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in 21st.dev — Pros
UI component marketplace 3D components Actionable insights Centralized UI components Easy integration Free componentsBoth tools — Pros
—Only in Alta AI — Pros
Mobile app development Easy to use Fast setup No-code tools Accurate responses Branding customization Cost-effective Dynamic tool FAQ import Google Drive integration No need for coding skills Scalable applications User-friendlyOnly in 21st.dev — Cons
—Both tools — Cons
—Only in Alta AI — Cons
Early stage platformDetails
| 21st.dev | Alta AI | |
|---|---|---|
| Categories | Website builders, No-code Platforms | Website builders, AI Chatbots |
| Platforms | Web | Web |
| Added | January 7, 2025 | March 16, 2023 |
| Website | 21st.dev | alta.so |
Who Should Pick Which?
Choose 21st.dev if...
- UI component marketplace
- 3D components
- Actionable insights
Choose Alta AI if...
- Mobile app development
- Easy to use
- Fast setup
With a FactScore™ of 42.3 vs 45.2, Alta AI leads in community reception. 21st.dev uniquely offers UI component marketplace and 3D components, while Alta AI stands out for Mobile app development and Easy to use.
What Users Say
21st.dev
Looks like a practical tool for speeding up UI development, especially when working with AI-driven apps. It’s helpful to have ready-to-use components instead of building everything from scratch. Ar...
This definitely simplifies the workflow for frontend developers. Having a centralized space for high-quality UI components saves a lot of time compared to searching for scattered solutions. Curious...
This feels like a great way to cut down on repetitive design work. I wonder how it handles versioning when components get updated.
Alta AI
I absolutely love Alta! This amazing no-code tool has revolutionized the way I approach mobile app development. By using their Nocode AI tools, I was able to get a mobile app at a fraction of the c...
Alta works great for building mobile apps without having to hire an engineer or figure out how to code it yourself!
It is amazing for building mobile apps! I myself am a sophomore who is eager to pursue software engineering in the future, this app is very amazing for helping me understand the steps it takes to b...
Frequently Asked Questions
Which is better, 21st.dev or Alta AI?
Based on FactScore™, Alta AI leads with a score of 45.2 vs 42.3. Alta AI has a higher rating of 5.0★ compared to 5.0★.
What are the pros of 21st.dev compared to Alta AI?
21st.dev uniquely offers: UI component marketplace, 3D components, Actionable insights, Centralized UI components, Easy integration.
What are the pros of Alta AI compared to 21st.dev?
Alta AI uniquely offers: Mobile app development, Easy to use, Fast setup, No-code tools, Accurate responses.
Is 21st.dev better rated than Alta AI?
21st.dev is rated 5.0★ from 6 reviews. Alta AI is rated 5.0★ from 7 reviews.
What is the FactScore™ of 21st.dev and Alta AI?
FactScore™ weighs rating and review volume together. 21st.dev scores 42.3 and Alta AI scores 45.2.
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