By Jesse Wood, founder of Build Until Publishing · November 10, 2026 · 6 min read
Comp titles are published books that are similar to yours in topic, reader and tone. To find them, search Amazon for books your reader already buys, check each one's category, rank and publication date, then pick three to five. You use them to choose categories, shape your cover and explain what makes your book different.
Think of comp titles as the neighbors your book will live next to. Picking the right ones makes every other publishing decision easier.
Comp titles (short for comparable titles) are the books a reader might pick up instead of yours, or alongside it. They matter because Amazon is a shelf with millions of books on it. Your categories, keywords, trim size and cover all work better when you know what your neighbors look like.
They also keep you honest. If you can't name three books your reader already loves, you may not know your reader well enough yet.
Start with your reader and work outward. Here's a simple process:
A good comp is a book your reader already bought and is close enough to yours that the same reader would buy both. Check each candidate on four points:
| Check | What to look for |
|---|---|
| Same reader | The cover, subtitle and description speak to the person you wrote for |
| Same promise | It solves a similar problem or tells a similar kind of story |
| Recent enough | Published in the last few years, so you're comparing to today's shelf |
| Realistic rank | Selling well, but not so famous that no new book could sit beside it |
Pick three to five. One mega-bestseller is fine for context, but fill the rest with books closer to your size, so the comparison is honest.
They show you where your book belongs. On KDP you choose up to 3 categories, so pick the ones your comps rank in. Open each comp's page, find its categories and note them down.
For keywords, you get 7 boxes of up to 50 characters each. Use phrases readers type, and skip words already in your title. Your comps' descriptions and subtitles show you the language your readers respond to. Don't copy their wording. Borrow the ideas and say it your own way. The full list of limits is in our Amazon walkthrough.
They show you what readers expect. Look at your comps' sizes and match them. Nonfiction is often 6 x 9 inches, and memoir and fiction are often 5.5 x 8.5 or 5 x 8. Then look at the covers lined up together. Yours should look like it belongs on the same shelf and still be easy to tell apart. Once you've settled on size, our KDP paperback formatting guide covers margins and bleed.
You position your book by saying, in one or two sentences, how it's like your comps and how it's different. Try this fill-in:
"If you liked [comp one], you'll like this, but it goes further on [what you add]."
Here's what a good answer does. It names a real difference, like a new angle, a gentler tone, a shorter path or a story from a place the others don't cover. It doesn't run the comps down, and it doesn't claim to be the best. Readers trust a clear, honest difference.
Inside Build Until Publishing, the Shelf Test reads your full manuscript and names the reader, the promise and three to five comparable titles in your category. It says plainly how your book is different, or where it falls short. One honest limit: the editor works from its own knowledge of the category and can't see today's sales ranks. So it tells you to check the comps on Amazon, and you should. The free Acquisitions Board gives you an early version of this read on your idea.
Your comps should also inform your pricing. See how KDP royalties work before you decide.
If you're part of the wider community at Build Until, ask a fellow author which books they'd put next to yours. A fresh pair of eyes often spots the obvious comp you missed.
Want a second opinion on where your book sits? Start free and you'll get your Voice profile and the Acquisitions Board's read on your idea.
Comp titles, or comparable titles, are published books similar to yours in topic, reader and tone. You use them to position your book, choose categories and keywords, and explain what makes yours different.
Three to five is a good number. Choose books your reader already bought, and mix a well-known title with a few closer to your own size.
Yes, ideally published in the last few years so you're comparing your book to today's shelf. Check each one's category and rank on Amazon, since those change.
They do. KDP lets you choose up to 3 categories, and the best ones are usually where your comps rank.