21st.dev

Create, remix and share UI components with AI

★★★★★ 5.0/5
FactScore™ 42.3
VS

Alta AI

Build an AI Chatbot with Google Drive and Slack in Minutes

★★★★★ 5.0/5
FactScore™ 45.2

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.

42.3
21st.dev FactScore™
👑
45.2
Alta AI FactScore™
★ Alta AI wins on FactScore™

Pros & Cons

Only in 21st.dev — Pros

UI component marketplace 3D components Actionable insights Centralized UI components Easy integration Free components

Both 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-friendly

Only in 21st.dev — Cons

Both tools — Cons

Only in Alta AI — Cons

Early stage platform

Details

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.

3

What Users Say

21st.dev

A
Artyom Jan 16, 2025
★★★★★

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...

S
Stepan Jan 15, 2025
★★★★★

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...

P
Pavel Jan 16, 2025
★★★★★

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

J
Jainil Apr 11, 2023
★★★★★

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...

J
Jeff Apr 11, 2023
★★★★★

Alta works great for building mobile apps without having to hire an engineer or figure out how to code it yourself!

A
Aum Aug 23, 2023
★★★★★

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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