KDP categories · Top KDP authors
Nayden Kostov: Amazon KDP author data
As of Nov 6, 2026, Nayden Kostov has 71 books on Amazon, 15 of them on a best-seller list in the last 30 days (best rank #1), mostly in Trivia & Fun Facts, Curiosities & Wonders, Trivia.
| Median price | $4.99 |
|---|---|
| Price range (middle 50%) | $3.99 – $4.99 |
| Median reviews | 576 |
| Total reviews | 9,091 |
| New books (30 days) | 1 |
| Breakout books (30 days) | 1 |
Nayden Kostov's best-ranked books
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397 DISTURBING FACTS AND FASCINATING TRUTHS ABOUT OUR WORLD: Shocking, Ironic or Inspiring Pieces of Trivia (Trivia and Quizzes)
by Nayden Kostov
- Price$4.99
- Rating4.4
- Reviews21
- Published2026-09
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383 Disturbing Facts about Our World: Shocking, Ironic or Simply Sad Pieces of Trivia (Trivia and Quizzes)
by Nayden Kostov
- Price$4.99
- Rating4.2
- Reviews256
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323 Disturbing Facts about Our World: Shocking, Ironic or Simply Sad Pieces of Trivia (Trivia and Quizzes)
by Nayden Kostov
- Price$4.99
- Rating4.2
- Reviews725
- Published2020-09
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373 Mind-Boggling Facts and Questions from the Puzzle Vault (Trivia and Quizzes)
by Nayden Kostov
- Price$3.99
- Rating4.2
- Reviews308
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A Question a Day Keeps the Boredom Away (Trivia and Quizzes)
by Nayden Kostov
- Price$4.99
- Rating3.9
- Reviews550
- Published2022-04
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1123 Hard To Believe Facts: From the Creator of the Popular Trivia Website RaiseYourBrain.com (Trivia and Quizzes)
by Nayden Kostov
- Price$3.99
- Rating4.0
- Reviews2,213
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463 Hard to Believe Facts: Better Explained, Counterintuitive and Fun Trivia (Trivia and Quizzes)
by Nayden Kostov
- Price$4.99
- Rating4.1
- Reviews755
- Published2021-04
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Which Is NOT True? - The Quiz Book: From the Creator of the Popular Website RaiseYourBrain.com (Trivia and Quizzes)
by Nayden Kostov
- Price$3.99
- Rating3.7
- Reviews601
- Published2016-12
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853 Hard To Believe Facts: Better Explained, Counterintuitive and Fun Trivia from the Creator of RaiseYourBrain.com (Trivia and Quizzes)
by Nayden Kostov
- Price$4.99
- Rating4.2
- Reviews1,745
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443 Disturbing Facts about Our World: Shocking, Ironic or Simply Sad Pieces of Trivia (Trivia and Quizzes)
by Nayden Kostov
- Price$4.99
- Rating4.2
- Reviews418
Main categories
FAQ
How many books does Nayden Kostov have on Amazon?
KDPTop tracks 71 of their books; 15 made an Amazon list in the last 30 days.
Which categories does Nayden Kostov publish in?
Their books chart most often in Trivia & Fun Facts, Curiosities & Wonders, Trivia.
How does Nayden Kostov price their books?
The median price is $4.99; half of the books cost $3.99–$4.99.
Has Nayden Kostov released new books recently?
1 new book in the last 30 days, 1 of which reached a Best Sellers list.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.