Amateur vs Pro: Advanced UI Design with Replit Design & Gemini 3 Pro
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Gemini 3 Pro just dropped and it is incredibly good at UI design. So I put it to the test with Replit's new design mode that uses Gemini 3 Pro under the hood - to see just how good the UI design is vs standard AI design output.
Long story short, the difference is crazy. And in this video I walk through how to use Replit's design mode, how to improve the UI design for your AI built app, and why Gemini 3 Pro might be the best AI model for design right now.
Chapters:
01:00 - What Replit Design Mode is 
02:35 - Why design-first workflow
04:10 - Set up: Build vs Design tabs
06:43 - First design pass (agent run)
07:13 - Compare: Default build vs design
09:05 - Design references + workflow
10:18 - Apply screenshot styling (prompt)
13:34 - Result: polished dashboard
14:52 - Tweak fonts, spacing, charts
15:20 - Bar chart update (select area)
17:05 - Color system unification
18:03 - Dark mode style reference
20:13 - Font direction: display + mono
22:22 - Result: typography upgrade
23:22 - Card styling: gradient strokes
25:17 - Graph polish: grid + axes
26:05 - Final UI showcase
26:41 - Takeaways: where Gemini 3 shines
Key points:
I walk through Replit design mode and how it works
I create the same app from the same prompt using the regular build mode and design mode, and compare the 2 outputs on design quality
I use 2 different UI style references to see how well Replit design mode does at interpreting and changing the design for the app
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