AI tools that grade your book
Interactive tools that score, test and validate your book, then tell you exactly what to fix. Free, instant, no signup to see your result.
- Book Audit — A full report card on your whole listing
- Cover Grader — Score your book cover against what sells
- First Chapter Critique — A graded critique of your opening pages
- Book Idea Validator — Test your book idea before you write it
- Book Title Showdown — Pit your title options against each other
- Blurb Tester — Score your blurb and get stronger versions
Which tool to start with
Match the tool to where your book is. Still at the idea stage? Run the Book Idea Validator to test demand, competition and your angle before you write. Choosing between titles? The Book Title Showdown ranks your options and names a winner. Drafting? The First Chapter Critique grades your opening pages. Getting ready to publish? Grade your cover concept with the Cover Grader and score your description with the Blurb Tester. If the book is already live, the Book Audit gives a report card on the whole listing.
How the grading works
Each tool reads what you enter and returns a structured result, not a chat reply. The Cover Grader and First Chapter Critique score six dimensions from 0 to 10, each with a verdict and one concrete fix, and turn them into an overall mark and letter grade. The Title Showdown and Blurb Tester rank your options side by side and mark the strongest. The Idea Validator gives a score out of 100 and a plain verdict, from Promising to Tough sell. Most real work lands in the middle of the scale, so a middling score is a starting point, not a failure.
Free, and what the limits are
Every tool is free to use with a few runs a day, and you see your full result without signing up. A free CruxOne account raises the daily limit. The results are an informed opinion from an AI trained to think like an editor, designer or market analyst. They are a fast way to catch problems early, not a replacement for real readers, a professional editor or live sales data.
From feedback to a finished book
Fix the lowest score first, then run the tool again to check the change helped. When you are ready to act on the results, CruxOne lets you write the manuscript, design the cover, format the interior and publish to Amazon KDP and other stores in one workspace, so the fixes go straight into the book.
Frequently asked questions
Are these AI tools for authors free?
Yes. Each tool gives a few free runs a day and shows your full result with no signup. A free account raises the limit.
Do I need to upload my book or cover?
No. The Cover Grader works from a description of your cover, and the other tools work from text you paste in, such as your blurb, title options or opening pages.
Can an AI grade replace an editor or cover designer?
No. It catches the common problems quickly so you can fix them before paying for professional help or launching, but it is not a substitute for human expertise.
Which tool should I use first?
Use the one that matches your stage: the Idea Validator before writing, the First Chapter Critique while drafting, and the Cover Grader, Title Showdown and Blurb Tester before you publish.