Refined Storage has an optional integration mod for Roughly Enough Items (REI), enhancing crafting and recipe interaction.
You can transfer recipes from REI directly into the Crafting Grid.


Recipes from REI can also be transferred into the Pattern Grid. The interface will show which ingredients are autocraftable.
Related items are grouped together in the recipe viewer.

You can use the R and U keys on the Grid and filter slots to view recipes and usages respectively.
You can sync the search box between REI and the Grid:

You can drag any type of ingredient from REI to filter slots in Refined Storage.

REI elements automatically reposition to avoid overlapping Refined Storage GUI components.