TomeLens

Know what a Kindle niche sells before you write.

TomeLens adds the numbers KDP authors need to Amazon's Kindle Store: organic rank, ads and exact ratings on every search result, and each book's Best Sellers Rank with estimated sales. Pro scores how hard a niche is and estimates royalties.

Coming soon to Edge Coming soon to Firefox

Free to install. Desktop Microsoft Edge and Firefox, on amazon.com's Kindle Store. A Chrome version is planned.

TomeLens in 45 seconds: badges, filters and sorting, the opportunity score, what opened books sell, title keywords, a book's rank and royalties, and research. Demo data and made-up books. No sound.

Read-only and private

TomeLens only reads the Amazon page you opened. It never acts on your account.

Read-only

Never clicks, buys or changes anything on Amazon or KDP.

No extra traffic

Reads only the page you opened, a search or a book. It doesn't load other Amazon pages.

Private

Your searches and the books you open stay in your browser. No tracking or analytics.

Research a niche in minutes

Search the Kindle Store and TomeLens adds a badge to every result and a panel with the numbers that matter. Open a few books and it adds what they sell.

Kindle Store results with a TomeLens badge on each one: Ad or organic rank, the Best Sellers Rank and estimated sales of a book opened before, Kindle+, Indie, exact ratings, the price to buy and the series.
Every result gets a badge: organic rank or ad, exact ratings, price, Kindle+, indie or publisher, series, and the rank of books you opened.

Free

  • Badges on every resultOrganic rank with ads left out, exact ratings, the price to buy, Kindle+, indie or publisher, and series.
  • Books you can beatDim or hide ads, hide books over 100, 500 or 2,000 ratings, or show only indie books.
  • Sort the pageBy fewest or most ratings, lowest price or best rated.
  • Page overviewResults for the search, the median price, and the share of ads and indie books.
  • Book inspectorOn any Kindle book, its Best Sellers Rank in the Kindle Store and its categories, with estimated sales a day and a month.
  • Ranks on your searchesBooks you've opened show their rank and estimated sales on later searches.

Pro PRO

  • Opportunity scoreA 0–100 score for each search, from page 1's ratings, ads, indie share and results.
  • What a niche sellsThe ranks and estimated sales of the books you've opened from a search, with the median.
  • PricingThe prices most books on page 1 charge, on a band from cheapest to dearest.
  • Title keywordsThe words and phrases top titles use, series names left out. Click any to copy.
  • Royalty estimateOn any book, what KDP pays a sale and a month at its rank, at its price or yours.
  • ResearchEvery search you open, side by side: score, results, ratings, indie share, price and what the books sell.
  • CSV exportDownload any results page, or all your research, for your own analysis.

Try it free: the free version unlocks Pro on 3 searches a day.

The TomeLens panel's Competition tab for a cat cafe mystery search: the price band, and what six opened books sell, from rank 2,950 at about 42 a day to rank 15,300 at about 9 a day, with a median of rank 7,800. The book inspector on a Kindle book page: Best Sellers Rank 4,812 in the Kindle Store, about 27 sales a day, three category ranks, and the royalty estimate at the book's price and at the author's own price.
The TomeLens research page listing saved Kindle Store searches with their opportunity score, results, median ratings, indie share, median price and the median rank of the books opened from each.
Research (Pro): every search you open, side by side. The searches and books in this example are illustrative.

Pricing

Start free. Upgrade when you want the full picture.

Free

$0

Forever

  • Badges on every result, with organic rank
  • Ads marked, dimmed or hidden
  • Filters for books you can beat
  • Sorting by ratings or price
  • Best Sellers Rank and estimated sales on any book
  • Page overview
  • Full Pro on 3 searches a day
Coming soon to Edge Coming soon to Firefox

Pro

$7 / month

or $49 / year, about 42% less

  • Everything in Free
  • An opportunity score for every search
  • What the books you open sell, per search
  • The words top titles use
  • Royalty estimates, at your price too
  • Research across all your searches
  • CSV export
Pro launching soon Yearly plan soon

14-day money-back guarantee. Cancel anytime. One license works in up to 3 browsers. Taxes may apply. Checkout and billing are handled by Lemon Squeezy.

Questions

Is TomeLens safe for my Amazon or KDP account?

TomeLens only reads what Amazon already shows on the page you opened. It never clicks, buys or loads other Amazon pages, and it never touches your KDP account.

Do I need an Amazon account?

No. Kindle Store searches and book pages are public. TomeLens never asks for your Amazon password.

How do you estimate sales?

Amazon doesn't publish sales, only each book's Best Sellers Rank, so every tool estimates. TomeLens uses a published curve fitted to rank trackers' data for the US Kindle Store: about 76,900 ÷ rank0.94 sales a day. Rank 5,000 is about 25 a day, and rank 120,000 about 1. Ranks also count Kindle+ borrows and move every hour, so treat the numbers as a guide for comparing books, not as Amazon's figures.

How are royalties calculated?

With KDP's ebook rates on amazon.com: 70% of the price minus $0.15 per MB for delivery, for prices from $2.99 to $12.99, and 35% outside that range. Kindle+ page reads are paid from a separate fund and aren't included.

Why doesn't every search result show a rank?

Amazon shows the Best Sellers Rank only on each book's own page, and TomeLens never loads pages you didn't open. Open the books you're curious about: their ranks appear on later searches and in the Competition tab.

What does "indie" mean?

A book sold by Amazon.com Services LLC, as KDP books are. Amazon's own imprints are sold the same way, so they count too. Traditionally published ebooks are sold by their publisher.

Which browsers and Amazon sites does it work on?

Microsoft Edge and Firefox on desktop, on amazon.com's Kindle Store. A Chrome version is planned.

How do I unlock Pro?

Buy Pro, then copy the license key from your receipt email. In your browser, open the TomeLens toolbar button, choose "Enter license key" and paste it. Before buying, you can try it: the free version unlocks every Pro feature on the panel for 3 searches a day.

Can I use one license in several browsers?

Yes, in up to 3 browsers. To move a license, deactivate it in the browser you no longer use.

How do I cancel?

Use the "Manage subscription" link in your receipt email. Pro stays active until the end of the period you already paid for.

Can I get a refund?

Yes, within 14 days of any payment. See the refund policy.

Is TomeLens affiliated with Amazon?

No. TomeLens is an independent tool. Amazon, Kindle and Kindle Direct Publishing are trademarks of Amazon.com, Inc. or its affiliates.