Science Fiction — Kindle Category Opportunity
Competition snapshot for the Science Fiction & Fantasy best-seller list, ease-of-entry score 2.5/100.
Category metrics
Score
2.5
Median reviews
14,712.5
Weak share (top 20)
5%
Median price
$5.99
Median star rating
4.6
Books scanned
50
Worth writing in?
Science Fiction is heavily defended: incumbents are deep-reviewed and the top 20 rarely cracks. New releases can still chart with ads or a launch push, but expect to climb over established authors rather than around them. Ease-of-entry score 2.5/100.
Breakout books — top 15, under 100 reviews, $0.99–4.99
Best-seller list on AmazonNo breakout books in this category.
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 |
|---|---|---|
| litrpg adventure | 12 | 216 |
| fights with monsters | 11 | 208 |
| fights with monsters litrpg | 9 | 158 |
| monsters litrpg adventure | 9 | 158 |
| dungeon crawler carl | 2 | 98 |
| sci fi | 2 | 52 |
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More Science Fiction & Fantasy categories
20 subcategories under this category
| Subcategory | Score | Median reviews |
|---|---|---|
| █████ | 50.5 | 304.5 |
| █████ | 48.0 | 1737.5 |
| █████ | 46.5 | 1226.5 |
| █████ | 45.5 | 774.5 |
| █████ | 44.5 | 2588.5 |
| █████ | 41.0 | 621.5 |
| █████ | 41.0 | 608.5 |
| █████ | 40.0 | 579 |
| █████ | 37.5 | 780 |
| █████ | 37.5 | 967 |
| █████ | 36.0 | 2645.5 |
| █████ | 35.0 | 597.5 |
| █████ | 6.0 | 957 |
| █████ | 5.0 | 12399.5 |
| █████ | 2.5 | 9806 |
| █████ | 2.5 | 2138 |
| █████ | 2.5 | 2182 |
| █████ | 0.0 | 10102 |
| █████ | 0.0 | 9350 |
| █████ | 0.0 | 16243.5 |
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.
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Research snapshot scanned on Oct 19, 2026. Refreshed periodically — not live tracking.