Reference — Kindle Category Opportunity
Competition snapshot for the Reference best-seller list, ease-of-entry score 48.0/100.
Category metrics
Score
48.0
Median reviews
443.5
Weak share (top 20)
30%
Median price
$3.49
Median star rating
4.6
Books scanned
50
Worth writing in?
The Reference list shows real reader demand with room left for newcomers: the median book carries 443.5 reviews, yet 30% of the top 20 still sit under 100 reviews. 3 top-15 books hold fewer than 100 reviews at $0.99–4.99 — classic self-publishing breakout books. Ease-of-entry score 48.0/100.
Breakout books — top 15, under 100 reviews, $0.99–4.99
Best-seller list on Amazon| # | Title | Star | Reviews | Price |
|---|---|---|---|---|
| 5 | Civilizations Map by Map: From Ancient Empires to Forgotten Cultures (DK History Map by Map) | 5.0 | 19 | $2.99 |
| 15 | The Highly Selective Dictionary of Golden Adjectives: For the Extraordinarily Literate (Highly Selective Reference) | 4.6 | 60 | $1.99 |
| 2 | The Highly Selective Thesaurus for the Extraordinarily Literate (Highly Selective Reference) | 4.6 | 79 | $1.99 |
High-frequency phrases in this category's titles
Mine all categoriesHigh-frequency phrases mined from the 50 best-seller titles on this category's list. The ease-of-entry score tells you how winnable the category is; these title phrases tell you which words readers search with — use the two layers together. Frequency is a title statistic, not a search-volume estimate.
| Phrase | Titles | Rank-weighted score |
|---|---|---|
| consumer reports | 4 | 111 |
| extraordinarily literate | 3 | 90 |
| highly selective | 3 | 90 |
| learn spanish | 3 | 64 |
| highly selective dictionary | 2 | 41 |
| beginners read for pleasure | 2 | 32 |
| fun way | 2 | 32 |
| level expand your vocabulary | 2 | 32 |
| pleasure at your level | 2 | 32 |
| vocabulary and learn | 2 | 32 |
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More Reference categories
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After you publish: why aren't readers buying?
Category research picks the direction; review diagnosis reads the readers. The same platform clusters a book's critical reviews into severity-ranked root causes, each anchored to verbatim quotes — see it applied to a full narrative-history title.
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Research snapshot scanned on Oct 19, 2026. Refreshed periodically — not live tracking.