Align UV is a simple to for aligning UV faces to XY axis and same size.
Version 3.0.0 is the complete redesign of the tool. It used a new engine.

You can use this tool in UV Editor , in Face mode of Edge mode.
Select faces in UV, then run the tool (Right Click inside the UV Editor, select Align UV at the bottom of Context menu).

In Edge mode, you can select a sequence of edges, then run the tool, and check the option "Align Faces by Edge"

Usage

Go to UV Editor in Blender, switch to Face or Edge mode,

Select Faces, right click inside the viewport, then select Align UV at the bottom of the pop up Context Menu.

Or, you can select Edges, right click inside the viewport, then select Align UV at the bottom of the pop up Context Menu.

Updates

Version 3.0.0, 3.0.1, 3.0.2

• Rewrite the tool and used a new algorithm. It improved the quality and speed. Single tool work for both edges and faces aligning.

It is a free addon !

Hope that you like it : )

Kushiro

https://x.com/kushirosea