Youbooks genuinely surprised me in a good way. Out of all the “AI writes your entire book” tools I’ve played with — and there were many — this one delivers the most coherent structure and the cleanest research. The content actually makes sense, feels organized, and lands in the right direction.

Now to the tricky part: writing style.
Every author has their own flavor — informative, playful, motivational, dead-serious… you name it. And that’s where Youbooks still struggles a bit. Even with one of my published books as a style reference, it didn’t really match my tone. Too many citations for my taste, sentences a bit stiff, and as a German writer I always use the informal “du.” The tool sticks with the very formal “Sie,” no matter what I feed it. Probably a very specific German-language problem, but still noticeable.

Would I recommend Youbooks?
Yes — at least to test it. This is Appsumo, so trying it for 60 days is a no-brainer.
And honestly: I haven’t found any other tool currently operating on this level. I’ve tested different agents, approaches, and “AI book builders,” and right now Youbooks is on top.

Is it perfect? Not yet.
At the moment, I still need to go through the full draft manually and tune quite a lot. But the potential is obvious. If the devs add more flexibility for style and language settings, this could become a seriously powerful tool.

Will I keep it?
Most likely yes — maybe even upgrade.
Even though I’m still picky about the German output and have very high standards, the value for money is unbeatable right now.