KDP Research Tools Outside the US (2026): Which Ones Actually Read amazon.co.uk, .de and .fr

If you publish into amazon.co.uk, amazon.de or amazon.fr, the first question about a KDP research tool is not “is it good” — it is “does it read my store at all”. Checked on 2026-08-22 against vendor pages: Publisher Rocket’s homepage names eight Amazon markets, BookBeam’s support docs name seven Amazon marketplaces plus two Audible stores, and KDSPY’s homepage names thirteen Amazon Kindle stores — while Book Bolt’s KDP Spy extension states it works only with the US .com site, and Self Publishing Titans publishes no marketplace list at all. That gap matters, because a US-only tool will still show you keyword and competition numbers for a market you are not selling in.

This page is a marketplace coverage matrix, not another ranking. Every row was checked against the vendor’s own site or help centre on 2026-08-22, and where a vendor does not publish a marketplace list, the matrix says so rather than guessing from third-party reviews. For the ranked, price-first comparisons we keep those separately, in our Publisher Rocket alternatives , BookBeam alternatives and Book Bolt alternatives guides.

Marketplace coverage matrix (checked 2026-08-22)

This table lists only what each vendor publishes itself. “Not published” means no official marketplace list was findable on the vendor’s own pages on the check date — it is not a claim that the tool lacks coverage, and it is not a figure borrowed from a review site.

Three caveats attach to that table, and they are the reason it is a matrix rather than a scoreboard.

Two vendor sites blocked our automated check on 2026-08-22 and returned 403 rather than a page: bookbolt.io itself, and Helium 10’s knowledge-base article “Which Tools Are Supported in Which Markets,” which is the authoritative per-tool list. The Book Bolt row above therefore comes from the vendor’s own Chrome Web Store listing, and the Helium 10 row from the vendor’s own blog rather than that knowledge-base article. Both are vendor-published; neither is the vendor’s most granular source.

KDSPY’s own homepage is internally inconsistent: one line says the tool “Supports data from 12 country specific Amazon Kindle stores,” while the list immediately below it names thirteen — USA, UK, Canada, Germany, Australia, Italy, Spain, France, India, Japan, Mexico, Brazil, and Poland, with Poland marked “just added.” The likeliest reading is that the count predates the Poland addition, but the vendor has not reconciled the two, so both numbers appear here as written.

One more thing the table cannot show: vendors revise these lists quietly. KDSPY’s own page marks Poland as “just added,” Helium 10’s international post carries a modification date of 2025-04-30 rather than a 2026 one, and none of the six publishes a changelog for marketplace coverage. A list checked today is a snapshot, which is why every row here carries its check date and its source rather than only a verdict.

Finally, a missing marketplace is usually a hard stop rather than an inconvenience. Nothing makes a US-only keyword tool return real amazon.de search data, and changing your own Amazon account country does not change what a tool’s backend indexes.

“Supported” is not one thing: three levels of marketplace support

When a KDP tool says it supports a marketplace, that can mean any of three quite different things, and vendors rarely spell out which.

Level 1 — the store is selectable. You switch a dropdown to amazon.de and the tool returns listings, BSR and prices from that store. This is the minimum, and it is what most marketplace lists actually describe.

Level 2 — search-volume estimates exist for that store’s language. Estimating how many people search a German phrase per month requires a model built on German queries. A tool can read amazon.de listings perfectly well at level 1 while its search-volume figures for that store are still thin or absent. None of the six vendors above breaks its marketplace list down this way on the pages checked, so the distinction is invisible from the pricing page.

Level 3 — category and royalty logic is localised. KDP category trees differ between stores, and so do trim sizes, printing costs and royalty maths. A tool surfacing US categories while you publish into amazon.co.uk is handing you a map of the wrong country.

The practical rule: treat any vendor’s marketplace list as a level-1 claim unless the vendor explicitly says otherwise, and test level 2 yourself during a trial or refund window.

The test takes about ten minutes. Pick a phrase that exists only in the target language and has no natural English equivalent — a compound noun in German, or a French phrase that translates into three English words — and run it through the tool with the store set to that marketplace. If the tool returns a plausible, store-specific search volume for it, the language model behind the estimates is real. If it returns zero, a suspiciously round number, or the same figure it gives for the English translation, you are looking at level-1 coverage dressed as level 2. Repeat with a second phrase before concluding either way; one blank result can just be a genuinely rare query.

The two extra things non-US authors run into

Data depth is not uniform across stores

Amazon’s non-US stores are smaller, and so is the number of books ranked in any given niche. Two consequences follow, and both are structural rather than a flaw in a particular tool.

The first is thin competition data. A niche returning a hundred-plus ranked competitors on amazon.com may return a handful on amazon.fr. Tools that score competition by averaging the top results get noisy when there are barely enough results to average.

The second is coarser sales estimates. Sales-rank-to-sales conversion has to be calibrated per store, and there is simply less underlying data behind the smaller stores. That is an argument for treating a number from amazon.es with a wider error bar than the same number from amazon.com — not for ignoring it.

Neither point makes these tools useless outside the US. It does mean you should weight your own real sales data more heavily as soon as you have any, and that a “verified niche” on a small store deserves a smaller first print run.

Pricing, billing and currency

Every tool in the matrix prices in USD. For a non-US author that adds two costs the pricing page never shows: your card issuer’s foreign-transaction fee and the exchange-rate spread. On a subscription those recur monthly; on a one-time purchase you pay them once. Two of the six sell no subscription at all. Publisher Rocket is a one-time payment — “$299 $199 and never pay again,” per its homepage, data checked 2026-08-22 — and KDSPY’s homepage quotes “a ‘one-time’ payment of $197 just $79 (with zero monthly recurring fees)” for KDSPY Pro, alongside “ONE TIME PAYMENT” and “No Monthly Recurring Fees” (data checked 2026-08-22). Self Publishing Titans is the mixed case: its research plans are subscriptions at $15 to $65 a month on yearly billing, but its pricing page also carries a “Lifetime” tab, and the FAQ under it says “Everything in this store is a lifetime license for the features listed on the product page. You pay once and can use the tool for life. No recurring fees” (data checked 2026-08-22). BookBeam publishes subscription pricing only — $47, $69 and $119 a month, or the same plans billed quarterly or annually — as does Helium 10, at $129 and $359 a month or $99 and $279 on yearly billing (data checked 2026-08-22). Book Bolt’s own pricing page returned 403 to our check on 2026-08-22; the most recent vendor copy we could read lists monthly and yearly plans with a three-day trial and names no permanent-licence option. That structural difference is worth more to a non-US buyer than to a US one, purely on FX.

There is a second, less obvious currency problem. Royalty and profit calculators inside these tools tend to assume USD list prices and US printing costs. Publish a paperback into amazon.de and KDP quotes the printing cost in EUR and does the royalty maths in EUR. Check any profit figure against KDP’s own printing-cost calculator before you set a price.

Whether the vendor adds VAT to your subscription is a third, separate matter — it depends on your country and whether you supply a VAT number, and it is a billing question for the vendor rather than a feature question.

Tool-by-tool notes for non-US authors

Publisher Rocket. Eight markets named on the homepage, and one of only two tools in this matrix sold with no subscription at all — KDSPY is the other (data checked 2026-08-22). Its market list covers every large European store except the Netherlands, and adds Canada and Australia. If you publish into English-language stores plus DE/FR/ES/IT, coverage is not your constraint here.

BookBeam. Seven Amazon marketplaces (US, Canada, UK, Germany, France, Italy, Spain) plus Audible US and Audible UK — the only tool in the matrix that publishes audiobook-store coverage, which matters if ACX and Audible are part of your plan. It does not name Australia.

KDSPY. The longest published list, thirteen stores including Japan, India, Mexico, Brazil and Poland — none of which any other tool in this matrix names. Its own count line says twelve; see the caveat above. Like Publisher Rocket, it is sold as a one-time payment rather than a subscription — “ONE TIME PAYMENT” and “No Monthly Recurring Fees” on its homepage, data checked 2026-08-22.

Book Bolt. Its KDP Spy extension states on its Chrome Web Store listing that it “currently works with the USA .com version of Amazon,” which is an explicit no for the three stores in this page’s title. The wider Book Bolt platform — design studio, interiors, lister — is not marketplace-restricted in the same way, and our Book Bolt review covers what the subscription includes.

Self Publishing Titans. No marketplace list on the homepage or on its own KDP niche-research extension page; the closest statement is an instruction to “go to Amazon.com (or other country).” Treat coverage as unverified and ask support before paying if a specific store matters to you. Its research plans are monthly or yearly subscriptions, but the same pricing page also sells individual tools and bundles as one-time lifetime licences, so which you are buying depends on which tab you are on (data checked 2026-08-22).

Helium 10. Broad market coverage, but it is a general Amazon seller platform rather than a KDP tool — its keyword and product data is built around physical-product listings, and books are a category it happens to see rather than a workflow it is designed for.

Which tool fits which non-US situation

Mainly amazon.co.uk and amazon.de. Coverage is your least constraint — four of the six name both. Choose on category data and price structure instead.

amazon.es, amazon.it or amazon.com.au. The field narrows. Australia is named by Publisher Rocket and KDSPY but not BookBeam; Spain and Italy are named by Publisher Rocket, BookBeam and KDSPY.

amazon.co.jp, amazon.in, amazon.com.mx, amazon.com.br or amazon.pl. Only KDSPY names these among the dedicated KDP tools. Otherwise the realistic workflow is manual — read the store’s own bestseller lists — with tools used for your English-language stores.

amazon.nl, amazon.se, amazon.com.tr and the rest. No dedicated KDP tool in this matrix names them. Helium 10 names the Netherlands, with the caveats above.

You publish low-content or no-content books. Research coverage is only half the decision here, because design, interiors and a lister matter as much as keyword data — and the tool with the strongest design side, Book Bolt, is the one with the narrowest published marketplace coverage. The usual resolution is to split the job: a research tool that reads your stores, plus a design tool that does not need to read any store at all. Our Book Bolt alternatives guide breaks that split down by workflow.

You want to stop paying monthly. Publisher Rocket and KDSPY are the only two of the six with no subscription option at all, which moves the FX cost from recurring to once-only. Self Publishing Titans sits in between: subscriptions for its research plans, one-time lifetime licences for individual tools and bundles (data checked 2026-08-22). The three-year cost comparison sits in our Publisher Rocket alternatives guide.

KDP eligibility is a separate question

Whether you can open a KDP account from your country, which tax form the interview puts in front of you, and how you get paid are account questions rather than tool questions, and they are settled before any of the above matters. This page does not cover them; for the eligibility, tax-interview and payout side, see amzbase’s guide to selling digital products on Amazon .

FAQ

Does changing my Amazon account country change what a KDP tool can see? No. These tools query Amazon’s public storefronts through their own backends. Your account country affects where you may publish and how you are paid; it does not change which storefronts a third-party tool indexes.

Can I use a VPN to get data for a marketplace my tool does not support? No. Marketplace support is a backend indexing question, not a geo-restriction applied to you. If a tool has no amazon.co.jp index, routing your own traffic through Japan changes nothing.

Are search-volume estimates for non-English stores reliable? Treat them as directional. Producing them requires a model built on that language’s queries, and none of the vendors checked here states which of its supported stores have genuinely localised volume data. Verify inside a trial or refund window by searching a phrase with no English equivalent.

Which tool names the most Amazon stores? Among dedicated KDP tools, KDSPY — thirteen stores listed on its homepage on 2026-08-22, against eight for Publisher Rocket and seven for BookBeam. Helium 10 names twelve Amazon markets but is a general seller platform rather than a KDP research tool. Naming a store is a level-1 claim, so the longest list is not automatically the best data.

This page compares third-party tools and is maintained independently. Marketplace coverage was checked against vendor pages on 2026-08-22; vendors change coverage without notice, so re-check before buying. Last updated: August 2026