I spent time actually testing Youbooks, not just clicking around, and here’s the straight take.

What it does well:
Youbooks is built for generating cohesive, long-form nonfiction books (up to 300k words) using multiple AI models, with real structure—not stitched blog posts. The workflow is guided: define the book, dial in style, add sources, approve a table of contents, then let it run. It’s clearly designed for people who want *books*, not quick articles.

The **style prompt system** is solid. Even without access to the higher-tier “human model,” I was able to shape tone and voice enough that the output didn’t feel too generic. Formatting is clean, exports are practical (DOCX, EPUB, Markdown, RTF), and the final book felt usable.

Credit system (important):
Credits are the real constraint. Writing a ~10,000-word book cost me about **18k credits**, and adding sources costs credits too—even if you gathered them elsewhere. On Tier 1 (200k monthly credits), that’s still plenty to produce multiple books, but you do need to be intentional. This isn’t a “spam infinite books” tool unless you’re on higher tiers.

I’m not a huge fan of paywalling Bring Your Own API Key behind upper tiers—but I also get the business logic. If you’re strategic with sources and don’t rely on built-in web search, Tier 1 is workable.

Time & quality:
My book took about 2 hours to complete. That might feel slow compared to instant tools, but the output reflects the multi-step process they advertise. Set it, walk away, get an email when it’s done. For actual book projects, that trade-off makes sense.

Biggest takeaway:
This is not for people chasing speed. It *is* for creators who want structured nonfiction assets they can sell, bundle, or use as lead magnets—without babysitting the process.

Overall? Youbooks earns a spot in the toolbox. Just go in understanding the credit economy and you’ll be fine. You can check out my review here: https://www.youtube.com/watch?v=IqTY2gti1ms

Why I rated this 4 tacos instead of 5:
Youbooks delivers real value and produces legitimate long-form nonfiction, but it still requires attentiveness. The credit system rewards intentional use, sources didn’t apply as expected on my first run(may have been my own fault), and Bring Your Own API key is locked behind higher tiers. None of these are deal-breakers....but they do add friction that keeps it from being a perfect score. If you’re deliberate and understand how credits work, this is a strong tool. I just don’t give 5 tacos unless the experience is nearly frictionless.