KDP Sentinel
KDP Sentinel
KDP Sentinel reads any Amazon book page and turns it into clear, honest research: real competition analysis, an A–F niche grade, sales & BSR trends, keyword & title tools, and a Strategy Coach that tells you exactly what to aim for.
Screenshot: side panel with Niche Grade + results table
Open the side panel on any Amazon book search, best-seller list or product page — the analysis updates as you browse.
One clear verdict on whether a niche is worth entering — blending demand, competition and how reachable the entry bar is.
Plain-English guidance for newcomers: target reviews, price band (or Kindle Unlimited strategy), the rating to hold, and a clear "enter or avoid" call.
Every book scored for how beatable it is. The soft targets rise to the top of a sortable, filterable table.
Crowdsourced rank and price history on books over time — trend data a single page view can't show you.
On any book, see its exact sub-categories with a "best pick" flag — and how many daily sales it takes to reach #1.
Related keywords from Amazon's own autocomplete, each one click-to-analyse for its real competition.
Paste your working title and see how it stacks up: keyword coverage, the proven niche words you're missing, and length vs the norm.
The recurring hooks and tropes across a niche's titles, at a glance — instant inspiration for your angle.
Export a clean, branded niche report — grade, strategy, competitors and keywords — to save, print or share.
A grid of every competitor cover on the page, so you can design something that stands out.
Pin any book — yours or a rival's — and watch its BSR & price over time from your Tracked list.
One click to Amazon's Movers & Shakers, Hot New Releases and Best Sellers — analysed instantly.
Export any analysed table to a spreadsheet — including grades, scores and estimates — for deeper work.
A clean, modern interface in light or dark mode, across all major Amazon marketplaces.
Add KDP Sentinel to Chrome, pin it, and open the side panel from the toolbar icon.
Search a keyword (e.g. "cozy mystery"), open a Best Sellers list, or land on any book's page.
Get the Niche Grade, Coach advice, competition table and trends — instantly, with no clicking around.
The #1 mistake new authors make is picking a niche that's already saturated. KDP Sentinel shows you the real competition before you spend months writing.
Review counts, ratings and competition are real Amazon data. Sales figures are clearly labelled as rough models — we show ranges, never fake precision.
Not just numbers — concrete targets: how many reviews to get visible, which price or KU strategy, which sub-category to rank in.
No account, no sign-up, no tracking. It reads only the pages you open — it never crawls or runs in the background.
KDP Sentinel only reads pages you deliberately open — it never crawls, opens tabs, or runs background requests. It needs no account and stores no browsing history.
You can optionally contribute anonymous public book facts (rank, price, rating, review count) to build the shared trend data that benefits everyone. It's off by default, contains no personal data, and you can turn it off anytime. See our privacy policy and terms of use.
Completely free — no account, no sign-up, no catch.
Add to Chrome — It's FreeKDP Sentinel is an independent tool and is not affiliated with, endorsed by, or sponsored by Amazon. Sales and revenue figures are rough estimates, not financial advice.