BookTrendr help: how KDP book niche research works

Step-by-step guides for Amazon KDP niche research — running a Niche Research analysis, reverse-ASIN keyword lookups, analyzing book categories, and monitoring bestseller rank — plus answers on how the data works and how to read your results.

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Guides

How to do Amazon KDP niche research with BookTrendr

Short, practical walkthroughs for BookTrendr's core research tools — no fluff, just what each one does and how to use it well.

How to run an Amazon KDP niche research analysis

Your core research tool — pulls live bestsellers, keyword demand, and an AI-scored opportunity summary for any topic.

  1. Type a topic and click Analyze (10 credits)
  2. Review the Opportunity Score and top bestsellers
  3. Check the Keywords, Categories, and Ideas & Strategy tabs
  4. Save the project to revisit it anytime, free

Reverse ASIN & book category analysis

See exactly what keywords a competitor's book ranks for, or get instant market stats from any Amazon category or search URL.

  1. Paste a competitor's ASIN or a category/search URL
  2. Review ranked keywords or aggregate market stats
  3. Use "Research →" to dig into any keyword further

How to track Kindle bestseller rank & reviews

Track BSR, price, and review changes on specific books or authors, and get alerted the moment something moves.

  1. Add a book or author from any results page
  2. Free plan includes 3 books, first month free
  3. For ongoing tracking, add the Monitor add-on (from any plan)
  4. Turn on email alerts in Settings → Notifications

KDP book title generator & keyword tools

Search Keywords, Search Categories, and the Title Generator are standalone tools you can run without a full analysis first — each costs a small number of credits, shown on its button.

  1. Find them under Tools in the sidebar
  2. Search Keywords costs 2 credits per run
  3. Search Categories costs 1 credit per run
  4. Title Generator costs 1 credit per run

Full guides

How to run an Amazon KDP niche research analysis

Niche Research is BookTrendr's core Kindle market research tool. It pulls live Amazon data for any topic — bestsellers, keyword demand, categories, and an AI-scored opportunity summary — so you can judge whether a book idea is worth writing before you write it. Think of it as an all-in-one Amazon book market analysis: demand, competition, and category fit in a single pass.

How it works

  1. Type a topic into the search bar (be specific — "keto diet for beginners" works better than "diet") and click Analyze. This costs 10 credits.
  2. You'll land on Top Paid Bestsellers — the current top sellers for that topic, with BSR, estimated sales/day, price, and reviews for each.
  3. Above the table, the Opportunity Score gives you a 0–100 read on the niche, with a plain-language summary explaining the number — search demand, review barriers, and where the real gap is.
  4. Switch to the Keywords tab to see related search terms, their monthly volume, and a Quick Score. Click "Research →" on any keyword to analyze it as its own topic.
  5. The Categories tab shows two things: categories your real bestsellers are actually shelved in (verified), and other categories worth considering based on keyword relevance. Use "Copy Path" to grab the exact category breadcrumb for your own book's categorization.
  6. Reader Analysis infers what readers likely want based on bestseller performance and search demand — not real review text, since that data isn't reliably available, but a grounded read on the market.
  7. Ideas & Strategy (opened separately, since it takes a moment to generate) gives you a verdict, differentiation angles, and a launch difficulty rating.
  8. Click Save to Projects to keep the analysis — it's free to save and revisit anytime from My Projects.
Tip: the "Latest Published" tab shows recent releases in the niche — a good signal for how active and how competitive a niche currently is, separate from the all-time bestseller list.

Reverse ASIN & book category analysis

Two different ways to research the competition directly, without running a full Niche Research analysis.

Reverse ASIN

Reverse ASIN is BookTrendr's reverse ASIN lookup tool for books — it shows you what keywords a specific competitor book ranks for on Amazon.

  1. Find a competitor's ASIN (the 10-character code in its Amazon URL, e.g. B0DCF34BWR)
  2. Paste it into Reverse ASIN and click Analyze (2 credits)
  3. You'll get a ranked list of keywords that book shows up for, sorted by relevance — useful for reverse-engineering how a successful book in your niche is actually getting found

URL Analysis

URL Analysis takes any Amazon category page, bestseller list, or search results URL and gives you instant aggregate market stats.

  1. Copy a URL directly from Amazon — a category page, a "Best Sellers in X" page, or a search results page all work
  2. Paste it in and click Analyze (3 credits)
  3. You'll see average price, average reviews, average rating, and total book count across everything on that page — a fast gut-check on a category's overall competitiveness

Both tools have a "Research →" link on individual results, letting you jump into a full Niche Research analysis for anything interesting you find.

Monitoring books, authors & categories

Monitor is BookTrendr's Kindle price tracker and bestseller rank tracker in one — it watches specific books, authors, and whole categories over time (BSR, price, and review count) and alerts you when something meaningful changes.

What counts as "meaningful"

  • BSR improves by 50%+ since the last check (breakout)
  • BSR worsens by 50%+ since the last check (drop)
  • A book crosses a review milestone (10, 25, 50, 100, 250, 500, or 1,000 reviews)
  • Kindle price changes by $0.50 or more
  • A monitored author publishes a new book

Getting started

  1. From any bestseller row, Reverse ASIN result, or Niche Research page, click the menu icon and choose "Add to Monitor"
  2. To track an author instead of a single book, go to Monitor → Authors and paste their Amazon author page URL
  3. To track a whole category for new titles and price changes, go to Monitor → Categories and paste an Amazon category or bestseller URL. The first snapshot is taken right away, and the category is checked again weekly.
  4. Every free account gets 3 books of monitoring, free, for the first month — no purchase needed
  5. For ongoing tracking beyond that, add the Monitor add-on from the Billing page — priced separately from your plan and available on any plan, including Free

Monitor add-on limits

The Monitor add-on comes in two tiers, each covering books, authors, and categories:

  • Starter Monitor — track up to 5 books, 3 authors, and 3 categories
  • Pro Monitor — track up to 20 books, 10 authors, and 10 categories
  • Free trial (first month, no purchase) — 3 books and 1 category; author tracking needs a paid Monitor tier

Turning on email alerts

  1. Go to Settings → Notifications
  2. Enter the email address you want alerts sent to and click Save
  3. Toggle on whichever of the five alert types you want to receive by email — in-app alerts (visible in the Alerts tab) always work regardless of your email settings

If you cancel Monitor: tracking pauses immediately, but your history is kept for 90 days. Resubscribe within that window and everything — including your existing books, authors, categories, and their snapshot history — picks up right where it left off.

Standalone tools & Book Title Generator

A few tools are available without running a full analysis, and cost little or nothing.

  • Search Keywords (Tools menu) — look up search volume and a Quick Score for any keyword or phrase. Costs 2 credits per run.
  • Search Categories (Tools menu) — find Kindle categories relevant to a topic, with a rough fit score. Costs 1 credit per run.
  • Reverse ASIN and URL Analysis are also reachable from Tools directly, without needing a saved project first.
  • Title Generator — enter your book's topic, genre, and a few optional details (target audience, angle) to generate 25 titles across 5 different proven formulas. Costs 1 credit per run.

These are a good starting point if you're not ready to spend 10 credits on a full analysis yet, or just want a quick, low-cost answer to one specific question.

Deeper checks on your results

Two optional actions go deeper on an analysis you've already run — you choose when to spend the credits:

  • Deep Scan (15 credits) — after a Niche Research, pick up to 8 keywords and run live Amazon rank checks to see exactly which books rank where for those terms. Use it when you want hard ranking data on a shortlist, not just the overview.
  • Load BSR & Categories (10 credits) — on a URL Analysis result, enrich the listed books with their live BSR and real category placements. Use it when you need the actual rank and shelf data behind a category page.
Support

BookTrendr FAQ: data, accuracy, credits & monitoring

Credits, Monitor, billing, and how BookTrendr's Kindle niche research features actually work. Can't find your answer here? Scroll down to send us a message.
Getting started
What is BookTrendr, and how does KDP niche research work?
BookTrendr is a Kindle market research tool for KDP and self-published authors. It pulls live Amazon data — bestsellers, keyword demand, categories, and competitor books — so you can validate a book idea before you write it.
What's the difference between the standalone tools and Niche Research?
The standalone tools (Search Keywords, Search Categories) give you a quick look at one thing at a time for a small credit cost — 2 credits for Search Keywords, 1 for Search Categories. Niche Research runs a full analysis — bestsellers, keyword demand, categories, and an AI opportunity score — for one topic in a single pass, and costs 10 credits.
Do I need a paid plan to use BookTrendr?
No. The free plan includes 20 credits on signup, usable on any feature — there's no plan-based restriction on what you're allowed to run, only on how many credits you have available.
What is a good BSR for a Kindle book?
There's no single number — it depends on the category. In general, a BSR under 10,000 in the main Kindle Store signals strong, consistent sales; under 100,000 is still meaningful in a smaller category. Niche Research shows you the actual BSR of real bestsellers in your topic, so you're comparing against your specific niche rather than a generic rule of thumb.
How do I estimate Kindle sales from BSR?
BSR and sales volume are correlated but not identical across categories, so we don't quote a single "BSR = X sales/day" formula. Instead, Niche Research shows an estimated sales/day figure per bestseller, modeled from real BSR and category data, so you get a grounded estimate rather than a generic chart.
How do I validate a book idea before writing it?
Run a Niche Research analysis on your topic. It shows you real demand (search volume), real competition (bestsellers, their reviews, and pricing), and an AI-generated opportunity score summarizing whether the niche looks worth pursuing — the same due-diligence a KDP researcher would do manually, in one pass.
How do I find low-competition book keywords?
In Search Keywords or the Keywords tab of Niche Research, sort by Opportunity — keywords marked "High" combine decent search volume with a specificity that suggests less direct competition. For a fuller picture, use the "Check real competition" option on any keyword to see actual competing books and their review counts.
How the data works & accuracy
Where does BookTrendr's data come from?
Amazon doesn't publish exact unit sales, and no tool has access to them. What BookTrendr does is gather the public signals that are available — bestseller rank (BSR), reviews, price, categories, and keyword demand — across an entire niche at once, then combine and analyze them into a single read on the market. Instead of opening dozens of listings and piecing it together yourself, you get the demand, competition, and opportunity picture summarized in one pass. The raw signals are public; the value is in collecting them at scale and turning them into an answer.
How is the Opportunity Score calculated?
The 0–100 score weighs demand against competition — it's not a measure of how popular a topic is. A high score needs both healthy demand and room to compete. Very popular search terms almost always score lower, because popularity attracts strong, well-reviewed competitors, and a market crowded with established books is genuinely harder to break into. So a mid-range score on a big keyword is the tool working as intended: it's telling you the demand is real but the competition is stiff. The plain-language summary under the score always explains which side — demand or competition — is driving the number.
Are the results based on current sales figures?
Yes — every analysis is a live snapshot of the market right now. That's a strength for spotting what's selling today, but worth keeping in mind for planning: a book can take months or years to go from idea to publication, and a niche that looks open today may fill up in that time. BookTrendr shows you the current landscape; it can't predict where a market will be in two years, and no research tool can. Use it to understand today's demand and competition, then factor in your own timeline.
Which Amazon marketplace does the data cover?
Currently Amazon.com (the US marketplace). It's the largest English-language book market, so it's the most useful single reference point — but reader tastes, pricing, and competition can differ in other countries. If you're publishing primarily for the UK, Australian, or another market, treat US results as a strong directional signal rather than an exact match. Other marketplaces are on our roadmap.
How accurate is BookTrendr, and how much should I rely on it?
Treat BookTrendr as a research tool, not a verdict. It's built to give you solid, data-grounded starting points — real demand and competition figures, plus an AI summary to help you interpret them — so you can make a more informed decision faster. But it's one input, not the whole decision. The strongest approach is to use BookTrendr's data points alongside your own judgment, other sources, and small market tests before committing to a book. AI summaries can occasionally misread a niche, which is exactly why every figure is shown with the raw data behind it. The book trade also moves fast — breakout hits often come from nowhere, and markets can shift — so no tool, ours included, should be treated as a guarantee of what will sell.
Credits & billing
How do credits work?
Each feature costs a fixed number of credits, regardless of your plan: Deep Scan is 15, Niche Research and Load BSR & Categories are 10, URL Analysis is 3, Reverse ASIN and Search Keywords are 2, and Search Categories, Title Generator, or a Monitor snapshot is 1. Each tool's button shows its credit cost before you run it.
What do I get on the free plan?
20 credits on signup, usable on any feature. There's no monthly renewal on the free plan — once your 20 credits are used, you'll need a paid plan or a credit pack to continue.
Do unused credits roll over?
Yes, on all paid plans — unused credits carry over month to month rather than resetting.
How do I cancel my subscription?
Go to Settings → Manage Subscription. That opens your billing portal, where you can cancel, update payment details, or view past invoices.
What's your refund policy?
Unused credit packs are refundable within 5 days of purchase. Credits already spent on an analysis aren't refundable, since that analysis was delivered. Subscriptions can be cancelled anytime — you'll keep access through the end of your current billing period, but we don't offer partial refunds for unused days. If a request fails or errors but still uses a credit, we'll refund it — contact us with details, ideally a screenshot, so we can resolve it quickly.
Monitor & alerts
What's Monitor, and why is it a separate purchase?
Monitor tracks your books, authors, and categories continuously in the background — checking BSR, reviews, and price on an ongoing schedule. Because it runs independently of any single analysis, it's priced and purchased separately from your main plan, and it's available as an add-on on any plan, including Free.
Do I get any monitoring for free?
Yes — every account gets 3 books of monitoring, free, for the first month, with no add-on purchase required.
What happens to my data if I cancel Monitor?
Tracking pauses immediately, but your history is kept for 90 days. Resubscribe within that window and everything is restored automatically.
I'm not getting email alerts — what should I check?
Make sure an alert email is saved in Settings → Notifications, confirm the specific alert type you're expecting is toggled on, and check your spam folder for messages from alerts@mail.ai4writers.club.
What triggers an alert?
Five things: a BSR improvement of 50%+, a BSR drop of 50%+, crossing a review milestone (10/25/50/100/250/500/1,000), a Kindle price change of $0.50 or more, and a monitored author publishing a new book.
Can I see a book's full ranking history, not just the latest snapshot?
Yes — open any monitored book's history from the Books tab to see its full BSR, price, and review trend over time, not just the most recent check.
Data & privacy
Can I export my data?
Yes, on Starter plan and above. Go to Settings → Privacy & Data → Export to download all your projects, monitored books, and alerts as a single file.
How do I delete my account?
Settings → Privacy & Data → Delete account. This schedules permanent deletion in 30 days, and you can cancel the request anytime before then from the same page.
Is my usage data shared or sold?
No. We don't run any third-party analytics or tracking. The only data we keep tied to your account is what's needed to bill you correctly and show you your own usage history — it's never anonymized, aggregated, or shared elsewhere.
Troubleshooting
A feature says "Coming soon" — what does that mean?
It means the UI exists but the feature isn't built yet — we'd rather show you that honestly than hide it or pretend it works. The Amazon Marketplace selector in Settings is currently the only example of this.
Niche Research seems slow — why?
It's pulling live data from Amazon and keyword sources in real time, not serving a cached or pre-built answer — a full analysis typically takes under a minute. If it's taking noticeably longer than that, let us know.
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