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Free Amazon Keyword Tools Compared: Where Each Free Tier Stops in 2026

Almost every Amazon keyword tool has a free tier, and almost none of them say on the pricing page where that free tier stops. The wall is nearly always one of four things: a daily search cap, a row cap that returns only the top handful of keywords, a sign-up wall, or a missing field — usually search volume, the one number you came for.

The short version, every limit read off the vendor’s own pages on 2026-09-08: for keyword ideas, free is genuinely enough — Keyword Tool Dominator gives two searches a day with no account, keywordtool.io hundreds of autocomplete suggestions without one either. For volume attached to those ideas, free runs out inside a session: Helium 10’s free plan states you can run Cerebro twice a day, and Amazon’s own search-query data sits behind a $39.99/month Professional selling account.

This page is the free-tier map. For the end-to-end method, read our Amazon keyword research process guide; for whether Amazon has indexed a keyword against your ASIN, the Amazon index checker guide; for free tools beyond keywords, our directory of free Amazon seller tools.

The Four Ways a Free Keyword Tool Stops

Knowing which wall you are about to hit is more useful than a feature list:

• Daily search cap. A hard count of lookups per day. Keyword Tool Dominator’s FAQ states two per day per keyword source; Helium 10’s free plan is documented at two Cerebro runs a day.
• Row cap. The search runs, but you only see the top few results — SellerSprite’s model on its Chinese and Japanese free plans, and Merch Titans’ for signed-out visitors.
• Sign-up wall. Free to use, but only after you hand over an email. Helium 10 and SellerApp both require an account; keywordtool.io explicitly does not.
• Missing field. Everything works except the column that decides anything — search volume, CPC and competition are usually reserved for paid tiers.

Every figure below is quoted from the vendor’s own public pages, not from a hands-on trial, and free tiers move — treat the 2026-09-08 stamps as a shelf life.

Free Amazon Keyword Tools Compared at a Glance

All prices and caps checked 2026-09-08. Where two official pages of one vendor disagree, both readings are given below rather than averaged; monthly and annual figures are listed separately because several pricing pages show both.

What You Can Actually Do for $0

Keyword Tool Dominator — two searches a day, no card

The clearest free-tier disclosure here. Its FAQ states: “Every keyword tool on this site includes 2 free searches per keyword source per day with no signup and no credit card.” The Amazon tool page repeats it — “Free keyword tool includes 2 searches per day per keyword source” — and shows a live counter reading SEARCHES: 2 / 2.

One caveat: the homepage advertises “No signup required”, while the pricing page states “All plans, including our Free tier, require a free account.” Paid access is one-time rather than a subscription, advertised on 2026-09-08 from $9 for 30 days to lifetime tiers of $89 to $149, every price carrying a sale flag.

SellerApp Freemium — a plan its own FAQ calls permanent

SellerApp’s pricing page lists a $0 Freemium plan marked “No Credit Card required”, and its FAQ says: “Yes, there is a forever free service plan available for Amazon Sellers under the Freemium Plan.”

The daily number is harder to pin down. A SellerApp article states “With SellerApp Freemium, you can conduct 10 searches a day for potential keywords” — but it was last modified in November 2023, and the current pricing page states no daily limit. Its entry price contradicts itself too: the pricing page shows Pro at $99/month, the help centre Pro-Lite at $39/month, so no single figure is stated here.

keywordtool.io — no sign-up at all

It describes itself as “A free keyword research tool … - no account required” and states it “Generates up to 750+ long-tail keyword suggestions for every search term”.

Whether free users see volume is presented inconsistently. Its Amazon page frames volume as paid — “Keyword Tool Pro, however, goes even further and pulls estimated search volume data” — while the homepage FAQ says the free version “may display search volume data for some keywords”. Plan for suggestions only. Paid plans start at $88/month billed monthly and $68/month billed annually.

Merch Titans — free to search, sign up to see everything

Its free keyword tool promises “Volume, CPC & Trends” and says “No signup required”; the merchtitans.com/tools index says what registering buys: “Sign up for Merch Titans to unlock unlimited keyword results, full trend history, and export capabilities.” Signed out you get a capped preview; no daily search cap is published. The paid plan is one tier at $39.99/month, or $29.99/month billed as $359.91/year, with no free trial and a 14-day money-back guarantee.

Helium 10 free plan — Cerebro twice a day

The most useful free reverse-ASIN allowance in the list, and the hardest to find. It is no longer one of the cards on the pricing page, which shows only Platinum, Diamond and Enterprise, but the sign-up page is live and Helium 10’s own plan documentation states: “You can use Cerebro twice a day to track up to 20 keywords.”

Two things Helium 10 does not publish: any free-tier number for Magnet, its keyword-expansion tool, which is absent from the free plan’s itemised list; and any statement that the plan was discontinued. An account is required; no page states a credit-card policy.

Its paid keyword allowance is presented inconsistently — the pricing page lists “100 searches monthly” for reverse-ASIN discovery on Platinum, the same company’s plan documentation “Cerebro, 250 daily uses” for that tier — so no allowance figure is stated here. The price is consistent: Platinum $129/month, or $99/month billed yearly. You can start on the Helium 10 free plan; our Helium 10 review covers the wider suite.

SellerSprite — free in Chinese and Japanese, trial-only in English

The discrepancy most comparison pages miss: SellerSprite’s English pricing page lists four paid plans and no free plan, its only free entry being a “FREE 3-Day trial of Monthly Plan” with “No credit card required”. Its Chinese and Japanese pricing pages, for the same product, both list a permanent free membership.

The Japanese page also publishes what that membership costs in depth: competitor ASIN lookups capped at two per day, keyword mining returning the top 20 rows (top 10 in the extension), keyword research the top 5. That is a row cap rather than a search cap — you can look all day and still see only the head of every list. Paid plans start at Basic $39/month, or $390/year.

Amazon’s Own Keyword Data Is Not Free

The most accurate Amazon search data comes from Amazon, and this is where the free trail ends. Three facts, each from Amazon’s own pages on 2026-09-08:

• Brand Registry is free. Amazon states plainly: “Amazon Brand Registry is a free program that helps you protect and grow your brand, even if you don’t sell in the Amazon store.” Enrolment needs a pending or registered trademark and a logo on your products — see our Brand Registry guide.
• Brand Analytics is not. The requirement is two-part: “To access Brand Analytics, you need a Professional selling account. You also need to be a Brand Representative for a brand enrolled in Amazon Brand Registry.” The Professional plan is $39.99/month plus selling fees, and the Search Query Performance dashboard inside Brand Analytics returns “a maximum of 1000 query results”. Our Brand Analytics guide covers the reports themselves.
• Product Opportunity Explorer is Professional-only. Amazon’s help pages state it twice: “Product Opportunity Explorer is currently available to Professional sellers only.”

Worth stating precisely, because plenty of comparison pages get it wrong: Amazon never describes Brand Analytics or Opportunity Explorer as free — neither page uses the word. What Amazon documents is an access requirement, and it carries a $39.99/month floor.

When the Free Tier Stops Being Enough

Four predictable breaking points:

• More than a couple of reverse-ASIN pulls a day. Two Cerebro runs cover one competitor; a category teardown needs twenty.
• The whole list, not the head of it. A top-20 view hides exactly the long-tail terms nobody is bidding on.
• Volume you can rank against. Autocomplete order is a popularity signal, not a number you can put in a bid.
• Export. Several free tiers zero out exports, and a workflow that cannot leave the browser is not a workflow.

Hit two of those in the same week and a paid plan is cheaper than the workaround.

If You Are Going to Pay, Which One

• Deepest reverse ASIN: Helium 10, Platinum $129/month or $99/month billed yearly. Its free tier is the natural on-ramp: the paid tier is the same tool with the cap lifted.
• Cleanest beginner workflow: Jungle Scout, which has no free tier at all — its FAQ states “While we do not offer a free trial, we do offer a 7-day money back guarantee”, so the guarantee is the trial. Starter is $49/month, or $29/month billed annually ($348/year). See our Jungle Scout guide.
• Widest raw keyword database: MerchantWords: Silver $35/month for 500 searches, Gold $79 for 1,000, Platinum $149 unlimited. No free plan is listed.
• Price-to-value with reverse ASIN: SellerSprite, Basic $39/month or $390/year, if the 3-day trial gets you far enough to judge it.
• Non-Amazon channels too: keywordtool.io, $88/month or $68/month billed annually, covering 16 platforms rather than Amazon alone.

Every third-party volume figure is a model, not Amazon’s query log. Cross-check the terms you build around before feeding them into listing optimization or a PPC campaign.

One Free Tool That Is Gone

Sonar, the free reverse-ASIN tool run by Perpetua (formerly Sellics), is no longer usable. Its perpetua.io page still loads, but a notice now sits over the search box: “We’re sorry, but this feature is no longer available.” The sonar-tool.com domain still resolves, but only to a dead parked address, and the old sellics.com path 301-redirects to a perpetua.io page that 404s. Older articles still list Sonar as live; as of 2026-09-08, it is not.

Frequently Asked Questions

What is the best free Amazon keyword tool?

It depends which wall you can live with. For depth without an account, keywordtool.io returns 750+ suggestions per search with no sign-up. For a documented daily allowance, Keyword Tool Dominator gives two searches per keyword source per day. For reverse-ASIN data, Helium 10’s free plan is strongest, capped at two Cerebro runs a day (checked 2026-09-08).

Is there a free Amazon keyword tool that shows search volume?

Partially. Merch Titans’ free tool advertises volume, CPC and trend columns, though the full result list needs a free account. keywordtool.io is inconsistent on its own site about whether free users see volume. SellerApp’s free keyword extension does not — its documentation routes volume to the paid keyword tracker. Amazon’s own data needs a $39.99/month Professional account plus Brand Registry.

Is an Amazon keyword scraper the same as a keyword tool?

Not quite. A scraper pulls raw terms from Amazon’s autocomplete and stops there — which is what most free tiers are, including Keyword Tool Dominator, keywordtool.io and SellerApp’s free extension. A full keyword tool adds modelled search volume, competition scores and reverse-ASIN lookups. Scraped autocomplete tells you a term exists and is roughly popular, not how popular relative to anything else.

Do free Amazon keyword tools require an account?

It varies, and some vendors contradict themselves. keywordtool.io explicitly does not. Keyword Tool Dominator’s FAQ says no signup while its pricing page says every plan including the free tier needs an account. Merch Titans lets you search signed out but gates the full list behind registration. Helium 10 and SellerApp both require an account first.

When is a paid Amazon keyword research tool worth it?

When you hit a cap twice in the same week. Two reverse-ASIN pulls a day is fine for one competitor and useless for a category teardown, a top-20 row cap hides the long tail you were hunting for, and no export means no keyword map. Below that, free tiers plus your own PPC search-term reports will carry you.

The Bottom Line

Free Amazon keyword tools are real, and more capable than the “start your free trial” framing suggests — but each stops somewhere specific, and vendors rarely put that number on the pricing page. Two searches a day, a top-20 row cap, a missing volume column, or a $39.99/month Professional account between you and Amazon’s own data: those are the walls. Pick the free tier whose wall you hit last, then run the result through the Amazon keyword research process.