All 88 categories
Maritime History & Piracy — Kindle Category Opportunity
Competition snapshot for the History best-seller list, vacancy score 3.5/100.
Fortress
Category metrics
Score
3.5
Median reviews
536
Weak share (top 20)
5%
Median price
$9.99
Median star rating
4.4
Books scanned
50
Worth writing in?
Maritime History & Piracy is defended territory: 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. Vacancy score 3.5/100.
Breakout books — top 15, under 100 reviews, $0.99–4.99
Best-seller list on Amazon| # | Title | Star | Reviews | Price |
|---|---|---|---|---|
| 14 | Crash Dive: True Stories of Submarine Combat | 4.1 | 87 | $3.99 |
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Research snapshot scanned on Oct 10, 2026. Refreshed periodically — not live tracking.