A Google Sheet with one tab per profession (Blacksmithing, Leatherworking, Tailoring, Enchanting, Jewelcrafting, Engineering, Alchemy, Cooking), recipes down the first column and a column per crafter with TRUE where they know it (the profession compendium layout). Share it as anyone with the link can view. Importing twice is safe: recipes already on the list are left alone.
Every crafter column of the sheet. Names on the roster are filled in. Settle the rest: the roster character it is, a new alt of a main (added to the roster), a crafter outside the guild (listed and marked as such), or skip it.
| In the sheet | Recipes | Is |
|---|