FlexBuilder: the best UI framework for Unity3D

For more details, see the Detailed Features page.

Comparison with Unity built-in frameworks

UnityUI

Unity built-in

Unity's built-in UI system

Slow

Works with all AssetStore assets

Works with all existing scripts/code

Live-editing in-game/editor

FlexBuilder

Asset Store

The best of CSS3/Flexbox ... in Unity

Works with all AssetStore assets

Works with all existing scripts/code

Live-editing in-game/editor

Very fast to edit, very fast to refresh

FIXES: core Unity's text-rendering

FIXES: core Unity's slow UI

Implements almost 100% of the CSS3/Flexbox spec

Quick-building UI buttons

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UIToolkit

Unity built-in

Experimental, 'not production ready'

Implements less than 90% of the CSS3/Flexbox spec

No live-editing

No integration with last 10 years of Unity UI scripts and assets

Slow to build/edit

Fast when not changing

Visual UI editor (buggy)