These two get used interchangeably all the time, and I understand why — they both turn your book into something more than a one-time read. But they solve genuinely different problems, and knowing which one you need saves you from building the wrong thing.
A workbook is built for a reader to work through on their own — worksheets, prompts, and activities that reinforce what's already inside your book. It's personal, self-paced, and doesn't require anyone else in the room.
A curriculum is standards-aligned, structured for teaching, and built to be delivered by someone else — a teacher, a facilitator, a trainer — to a whole room, over time, not by one reader alone at their kitchen table.
If you want readers to reflect, a workbook is enough. It's simpler to build, faster to launch, and perfectly suited for personal engagement with your material.
If you want your book taught — in classrooms, workshops, or organizational trainings — a curriculum is what actually gets you there. It's a bigger build, but it's what turns your book into something an institution can adopt and repeat, year after year.