Amazon KDP Sub-Niche Finder — Discover & Score Low-Competition Niches

Enter one seed topic and get back the sub-niches you didn't know existed — each auto-expanded from Amazon's own search suggestions and scored 0–100 for how easy it is to rank. Competitors only score the keyword list you already have; this finds the keyword angles first, then scores them.

The difference: discovery, not just scoring

You give it	You get back
nurse planner	nurse planner 2026-2027, nurse planner with hourly schedule, …
adhd workbook	adhd workbook for women, adhd workbook for teens, …

Every seed expands into Amazon's real autocomplete suggestions (what shoppers actually type), then each sub-niche is scraped live and scored. The sub-angles are where the open lanes are — the broad seed is usually saturated, but its long-tail children aren't.

Opportunity score (0–100)

• 🟢 70–100 opportunity — low competition, few reviews, room to rank
• 🟡 40–69 moderate — some competition
• 🔴 0–39 saturated — entrenched best-sellers, hard to break in

The score penalizes review saturation (avg reviews per book), best-seller presence (any book with 1,000+ reviews), crowded results, high prices, and very-established ratings. Prices are forced to USD regardless of IP location.

Input

Field	Type	Default	Description
seeds	array[string]	["nurse planner 2026"]	Topics to expand + analyze
expansionMode	choice	suggestions	suggestions / alphabet / modifiers / deep
marketplace	choice	us	amazon.com, .co.uk, .ca, .com.au, .de, .fr, .it, .es, .in
maxKeywordsPerSeed	integer	50	Keywords to expand per seed
maxCompetitionKeywords	integer	10	Keywords to run competition analysis on
maxResultsPerKeyword	integer	20	Books scraped per keyword

Output

Dataset rows (two types):

{ "type": "keyword", "keyword": "nurse planner 2026-2027", "seed": "nurse planner", "rank": 1 }

{
  "type": "niche",
  "keyword": "nurse planner 2026-2027",
  "verdict": "moderate",
  "score": 67,
  "avgReviews": 38,
  "avgPrice": 16.8,
  "avgRating": 4.6,
  "books": [
    { "asin": "B0...", "title": "Nurse Planner 2026", "rating": 4.8, "reviews": 42, "price": 14.99 }
  ]
}

Plus NICHE_ANALYSIS in the key-value store summarizing all verdicts.

Pricing

Pay-per-event, free to discover:

• Keyword expansion is free — the expanded sub-niche list costs nothing.
• niche-analysis — $0.02 per scored niche + apify-actor-start ($0.05, auto).

A run that scores 3 sub-niches costs $0.11; 10 sub-niches costs $0.25 — in line with KDP niche tools on the store, against $79–199 for Publisher Rocket / KDSPY.

Notes

• No browser key or Amazon account needed. Prices forced to USD.
• Amazon does not publish search volume — competition is measured from live results (review counts, price, rating), not a modelled number.
• Review counts may be null when Amazon lazy-renders them; the score uses whatever is available.
• Amazon terms govern automated access — use lawfully.