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
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Works with all AssetStore assets
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Works with all existing scripts/code
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Live-editing in-game/editor
FlexBuilder
![](https://flexbuilder.ninja/wp-content/plugins/dk-pricr-responsive-pricing-table/inc/img/rpt_recommended.png)
Asset Store
The best of CSS3/Flexbox ... in Unity
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Works with all AssetStore assets
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Works with all existing scripts/code
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Live-editing in-game/editor
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Very fast to edit, very fast to refresh
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
FIXES: core Unity's text-rendering
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
FIXES: core Unity's slow UI
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Implements almost 100% of the CSS3/Flexbox spec
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Quick-building UI buttons
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
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Fast when not changing
![](http://flexbuilder.ninja/wp-content/uploads/2023/09/1930264_check_complete_done_green_success_icon-1.png)
Visual UI editor (buggy)