Three checks to validate a book idea before you make it

The most common reason self-published notebooks and journals don’t sell has nothing to do with the design. The book was made for a niche nobody was shopping in, or one so crowded it never gets seen.

Here are three checks that take about ten minutes and use nothing but Amazon itself.

1. Read the search suggestions

Open Amazon in a private browser window, so your own history doesn’t affect the results, and start typing your idea slowly. For example: “gratitude journal for”.

The suggestions that appear are what shoppers are actually typing: “for women”, “for teens”, “for kids 8-12”. Each one is a smaller, more specific niche than the broad phrase you started with. Add a letter after your phrase (“gratitude journal for a”, “for b”) to discover more.

Keep in mind that a suggestion proves people search for something, not that they buy it. That’s what the next two checks are for.

2. Look at recent reviews

Open three to five books from the first page of results. In the reviews, sort by most recent and look at the dates.

If a book has five to ten reviews from the last three to six months, it is selling steadily today. If the newest review is two years old, the demand may have moved on.

While you’re there, read the two and three star reviews. Buyers describe exactly what disappointed them: “wish it had more pages”, “paper too thin for markers”, “no prompts”. That list is your chance to make a better book, not just another one.

3. Compare the Best Sellers Rank

In each book’s product details you’ll find its Best Sellers Rank, or BSR. Look at the overall rank in Books, not the smaller category rank, which can be misleading.

A lower number means more sales. As a rough guide for low-content books, a rank under about 100,000 usually means the book is selling at least a copy a day, while a rank over a million means it rarely sells. These are estimates, since Amazon doesn’t publish sales figures, but they’re useful for comparison.

The signal to look for is a book with fewer than fifty reviews but a strong rank. It means buyers are there and the competition hasn’t settled in yet.

Put it together

Only move forward with an idea that passes all three:

1. Real search suggestions for your specific angle
2. Recent reviews on the books already selling
3. At least a few books with a strong rank and modest review counts

It’s a short routine, and it saves you from spending a weekend designing a book nobody is looking for.