Good comps are recent, in your exact niche and selling, but not so big they make you look naive. Here is how to find them, and what to avoid.
A good comp title for a romance novel is a book published in the last two to three years, in the same niche as yours (sub-genre, heat level and lead trope), that sold well enough to prove readers exist but not so well that comparing yourself to it looks unrealistic. For querying, agents expect two comps that meet those tests. For self-publishing, comps tell Amazon ads, also-boughts and readers who your book is for.
Three checks cover most of it.
This is slow because it means sampling dozens of books. It is also the part most authors skip, which is why so many query letters comp the same five famous titles.
The usual forms are "Title A meets Title B" or "for readers of Author X". The first works best when each title brings one clear ingredient, for example one for the setting and one for the dynamic. For ads and blurbs, "for readers of" is safer because it targets an audience without promising the same story.
The Comp Report ($15) does the sampling for you from our daily Amazon chart data. It returns three kinds of comps: the shelf leaders who show the ceiling, realistic midlist peers with their chart evidence (days in the top 50, best rank, price, Kindle+ or wide), and books in your exact niche published in the last two years. You also get ready-to-use comp lines, an honest check of any comps you already use, and a short list of comps that look right but would hurt. The Pitch Report includes the same comps plus a logline and query paragraph.
For querying, aim for books published in the last two to three years. Older books suggest the market has moved on.
Avoid mega-bestsellers as your main comp. They make the comparison look unrealistic. A book that charted and held is more convincing.
Two is standard in a query letter. For self-publishing, a short list of five to ten helps with ad targeting and also-boughts.
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