MerchantWords vs ZonGuru (2026): which should you pick?

Pick MerchantWords if

• Fits if you write Amazon listings and want the phrases shoppers type there
• Works for checking which keywords put a rival's product on Amazon's first page

Look elsewhere if

• Not for you if you want to try before paying, as there's no free plan or trial
• Skip it if you sell on Walmart, eBay or Etsy too, as that data is only a custom report on request
• Tight if you sell in several countries, as Silver covers one; regional data needs Gold at $79
• Watch out: the whole database refreshes every 3 to 4 weeks, so figures can lag
• Pricey if you need every marketplace, at $149 a month for Platinum, or $749 for a team of up to 20

Pick ZonGuru if

• Fits if your listings need rewriting and you'd rather not do it yourself
• Works for agencies looking after listings for several US or UK Amazon clients

Look elsewhere if

• Skip it if you sell outside the US and UK
• Pricey if you only need a few listings fixed, at $124 a month for 5 rewrites, with extras at $49 each
• Not for you if you were after ZonGuru's old product and keyword research
• Watch out: Helix needs a Seller Central connection on an Amazon Professional selling plan
• Tight if you want to try the rewrites first, as the free score rewrites nothing and Helix has no trial

MerchantWords

• There is no free plan, and the help center says there is no free trial.
• Silver covers one country only; regional and global data need Gold or Platinum.
• The data is from Amazon only; Walmart, eBay or Etsy data is offered as a custom report on request.
• Search data is collected daily but the whole database is refreshed every 3 to 4 weeks.

ZonGuru

• Helix works only on the US and UK Amazon marketplaces.
• Plans need a Seller Central connection on an Amazon Professional selling plan.
• Extra rewrites are bought as credits at $49 for one or $99 for three; credits bought this way never expire.
• ZonGuru's older product and keyword research tools are no longer on its pricing page, which now sells only Helix.

MerchantWords

Classic Search

Look up a keyword to see phrases that contain it, with estimated Amazon search volume and seasonality, and save them to collections.

Keyword Multiplier and Explorer

Keyword Multiplier generates related and complementary keywords from a search; Keyword Explorer is where research is reviewed and edited.

ASIN Plus

A reverse ASIN lookup that shows which keywords put your product, or a competitor's, on the first page of Amazon results.

Page 1 Products

Shows the top-ranking products for any keyword on the first page of Amazon search, with figures on how crowded the market is.

Emerging Trends and history

Emerging Trends lists searches that are new on Amazon, and a history panel charts when a keyword's searches rise and fall.

Bulk Search and Product Tracker

Search many keywords or ASINs at once, and track a product's keyword rankings every day.

ZonGuru

AI Readiness Score

Scores every listing from 0 to 100 and ranks them by fixable gap and revenue at stake, so the most valuable fixes come first.

Listing rewrites

Rewrites titles, bullets, descriptions and shopper questions in one pass for Amazon's A9 search and its AI shopping assistant, within Amazon's 75-character title cap.

One-click publishing

Shows the before and after for approval, then publishes the new copy to Amazon and confirms it is live.

Nightly monitoring

Checks watched listings nightly for score drops and outside edits, and more often for suspensions and a lost Buy Box.

MCP access

Every subscription can connect Claude or another MCP-capable AI tool to Helix to pull Amazon data and run rewrites from there.

MerchantWords

• Silver$35

  per month for 500 searches, billed monthly

  One country's Amazon data and 10 keyword collections, for new sellers. Keyword Multiplier and Emerging Trends are not included.

• Gold$79

  per month for 1,000 searches, billed monthly

  Data for one region, such as North America, 100 keyword collections, and Keyword Multiplier and Emerging Trends.

• Platinum$149

  per month for unlimited searches, billed monthly

  Global data across every marketplace covered and 1,000 keyword collections, for brands, investors and teams.

• Enterprise$749

  per month for unlimited searches, billed monthly

  Up to 20 users, 10,000 collections and every feature, for large teams and agencies. Set up by contacting sales.

ZonGuru

• AI Readiness Score$0

  Scores a live listing's text from 0 to 100 on meaning and buyer question coverage. It does not rewrite or monitor anything.

• Helix Starter$124

  per month, billed annually at $1,490 ($149 billed monthly)

  Up to 15 watched listings and 5 rewrites a month, with monitoring and alerts, a Seller Central connection and MCP access.

• Helix Growth$249

  per month, billed annually at $2,990 ($299 billed monthly)

  Up to 50 watched listings and 10 rewrites a month, with the same monitoring, publishing and MCP access.

• Helix Pro$583

  per month, billed annually at $6,990 ($699 billed monthly)

  Up to 100 watched listings and 25 rewrites a month.

• Helix EnterpriseCustom

  Custom listing and rewrite counts with volume pricing and priority support, quoted by sales; aimed at agencies with many clients.

MerchantWords

• Annual discount

  Two months free with annual billing

  MerchantWords' help center says an annual subscription gives two months free, for example $790 a year for Gold and $1,490 for Platinum.

ZonGuru

• Annual discount

  Save 17% with annual billing

  Billed yearly, Helix Starter is $1,490 ($124 a month) instead of $149 a month; Growth and Pro are discounted the same way.