Reference & Collections — Kindle Category Opportunity
Competition snapshot for the Biographies & Memoirs best-seller list, ease-of-entry score 6.0/100.
Category metrics
Score
6.0
Median reviews
251.5
Weak share (top 20)
10%
Median price
$6.99
Median star rating
4.5
Books scanned
50
Worth writing in?
Reference & Collections is between the extremes: 10% of the top 20 is under 100 reviews against a median of 251.5, so entry depends on the specific sub-genre and your launch strength. Read the breakout books below before judging. Ease-of-entry score 6.0/100.
Breakout books — top 15, under 100 reviews, $0.99–4.99
Best-seller list on Amazon| # | Title | Star | Reviews | Price |
|---|---|---|---|---|
| 14 | SAVED BY SECONDS: Memoirs of a Firefighter Paramedic's Journey (That Lives May Be Saved) | 4.8 | 27 | $4.99 |
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 |
|---|---|---|
| serial killers | 4 | 161 |
| true crime | 3 | 119 |
| serial killer | 3 | 113 |
| 150 serial killer files | 2 | 74 |
| big book of serial | 2 | 74 |
| files of the world | 2 | 74 |
| world worst murderers | 2 | 74 |
| de la | 2 | 40 |
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More Biographies & Memoirs categories
Check the keywords before you write
Category scores show where entry is easiest; keyword lookups show whether readers actually reach for it. A free account includes keyword competition lookups plus unlimited category scans.
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.
Keep researching with the free tools
Research snapshot scanned on Oct 19, 2026. Refreshed periodically — not live tracking.