Earth Sciences — Kindle Category Opportunity
Competition snapshot for the Science & Math best-seller list, ease-of-entry score 49.5/100.
Category metrics
Score
49.5
Median reviews
506.5
Weak share (top 20)
35%
Median price
$4.99
Median star rating
4.6
Books scanned
50
Worth writing in?
The Earth Sciences list shows real reader demand with room left for newcomers: the median book carries 506.5 reviews, yet 35% of the top 20 still sit under 100 reviews. 2 top-15 books hold fewer than 100 reviews at $0.99–4.99 — classic self-publishing breakout books. Ease-of-entry score 49.5/100.
Breakout books — top 15, under 100 reviews, $0.99–4.99
Best-seller list on Amazon| # | Title | Star | Reviews | Price |
|---|---|---|---|---|
| 4 | Fractured Awakening: A Post-Apocalyptic Survival Thriller (Caldera Chronicles Book 1) | 5.0 | 10 | $0.99 |
| 7 | Against What Comes | 4.5 | 70 | $3.99 |
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 |
|---|---|---|
| scientific american | 3 | 119 |
| ring of fire | 3 | 90 |
| new history | 2 | 70 |
| secret world | 2 | 69 |
| apocalyptic thriller | 3 | 68 |
| echoes of the world | 2 | 36 |
Sign in and click any phrase to send it straight to the keyword competition lookup.
More Science & Math categories
10 subcategories under this category
| Subcategory | Score | Median reviews |
|---|---|---|
| █████ | 78.0 | 4 |
| █████ | 75.5 | 9 |
| █████ | 70.0 | 7 |
| █████ | 55.5 | 41 |
| █████ | 49.0 | 114 |
| █████ | 45.0 | 322 |
| █████ | 45.0 | 114 |
| █████ | 16.0 | 82 |
| █████ | 13.5 | 125.5 |
| █████ | 6.0 | 564.5 |
Subcategory names are visible after sign-in — a free account unlocks every subcategory score.
Sign up free to unlockCheck 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.