Best for
Best for Etsy sellers who make their own products and want to test an idea against the market before making it.
- Freelancers
E-commerce Seller Tools Comparison
What Sells Next vs. ZonGuru
At a glance
At a glance
Best for
Best for Amazon brand owners and agencies that want existing listings scored, rewritten and monitored.
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | What Sells Next | ZonGuru |
|---|---|---|
| Starting price | Free Premium is £12 per month, tax included, cancel anytime. | From $124 / month, billed annually Starter is $1,490 a year billed annually, or $149 a month billed monthly. |
| Free trial | No trial; an ongoing free plan instead | Free AI Readiness Score for a live listing |
| API | Not stated | MCP access for AI tools on every plan, and an SP-API connection to Seller Central |
| Hosting | Cloud: a web app and a Chrome extension | Cloud: web app |
| Made in | United Kingdom | Not stated |
| Product research | Product discovery, Opportunity Radar and the Crossover Lab, which combines a product with a theme. Idea checks show comparable Etsy listings, asking prices and buyer signals, with an idea board and build guides for planning the make. | Not stated |
| Marketplace keyword research | Keyword research and Keyword Smash | Not stated |
| Listing optimisation | Listing audit, AI listing drafts with editable titles, descriptions and 13 tags, AI copy reviews of connected listings, saved listing drafts, concept visuals and listing videos from product photos | Helix rates each managed listing with an AI Readiness Score from 0 to 100 on meaning and buyer Q&A coverage, rewrites it and publishes the copy to Amazon, then monitors it with alerts; rewrites per month are set by plan |
| Competitor tracking | Competition watch with estimated sales and revenue, search visibility for connected shops, and a weekly market briefing | Not stated |
| Fee and profit calculation | Fee and profit calculator | Not stated |
| Marketplaces covered | Etsy | Amazon US, UK, Canada and Australia |
| Integrations and API | An optional read-only Etsy shop connection, with changes copied into Etsy by hand, and a Chrome extension | MCP access for AI tools on every plan and an SP-API connection to Seller Central, which requires an Amazon Professional selling plan |
| AI features | Yes | Yes |
| MCP-ready | No | stated Yes |
| Deployment | Cloud (SaaS), Browser-based | Cloud (SaaS), Browser-based |
| Company size | Freelancers | Not stated |
| Integrations | more entries Etsy, Chrome extension | Amazon Seller Central |
Add a tool
Adds a column to the table, from the tools in this category.
Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.
The short version
Key Differences
- Starting price What Sells Next Free ZonGuru From $124 / month, billed annually
- Free trial What Sells Next No trial; an ongoing free plan instead ZonGuru Free AI Readiness Score for a live listing
- Hosting What Sells Next Cloud: a web app and a Chrome extension ZonGuru Cloud: web app
- MCP-ready What Sells Next No ZonGuru Yes
- Listing optimisation What Sells Next Listing audit, AI listing drafts with editable titles, descriptions and 13 tags, AI copy reviews of connected listings, saved listing drafts, concept visuals and listing videos from product photos ZonGuru Helix rates each managed listing with an AI Readiness Score from 0 to 100 on meaning and buyer Q&A coverage, rewrites it and publishes the copy to Amazon, then monitors it with alerts; rewrites per month are set by plan
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
What Sells Next
Strengths
- Free plan with daily keyword lookups and idea checks, no card needed
- Idea checks show comparable Etsy listings, asking prices and buyer signals
- Fee and profit calculator and build guides sit next to the research
- The Etsy shop connection is optional and read-only
Limitations
- The site names Etsy as the only marketplace
- Listing changes have to be copied into Etsy by hand
- Competitor sales and revenue are estimates
- The site does not state the company or country behind the tool
ZonGuru
Strengths
- MCP access included on every plan
- Publishes rewritten listings to Amazon through Seller Central
- One-off credits at $49 each for sellers without a plan
- Managed-listing data is held for 60 days after cancelling
Limitations
- Covers Amazon US, UK, Canada and Australia only
- Seller Central connection requires an Amazon Professional selling plan
- Plan credits reset monthly and do not roll over
- Scoring and monitoring require a paid plan
Plans
Pricing
What Sells Next
- Free £0 5 keyword lookups per day, 3 starter crossovers and 5 idea checks per rolling 24 hours. No card needed.
- Premium £12 Per month, tax included, cancel anytime. Introductory offer: the first month is £5.
ZonGuru
- Helix Starter $149 / month billed monthly, or $1,490 / year billed annually Up to 15 managed listings and 5 transformations a month, with monitoring and alerts, the SP-API connection, MCP access and the AI Readiness Score.
- Helix Growth $299 / month billed monthly, or $2,990 / year billed annually Up to 50 managed listings and 10 transformations a month.
- Helix Pro $699 / month billed monthly, or $6,990 / year billed annually Up to 100 managed listings and 25 transformations a month.
- Helix Enterprise Custom Custom listing and transformation limits, volume pricing on request and priority support.
- Transformation credits $49 for 1 credit, $99 for 3 No plan required; one credit buys one transformation, and the vendor states purchased credits never expire.
What users say
Review Scores · opens after launch
What Sells Next
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Nothing has been published here yet, and no score is shown. How a review is checked before it appears is described below.
ZonGuru
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Nothing has been published here yet, and no score is shown. How a review is checked before it appears is described below.
How we check reviews
Before sending, the author has to confirm three things: that they have used the product themselves, that they work neither for the vendor nor for a competitor, and that nobody is paying them for the review. We also ask whether the vendor invited them to write it. That answer is required, either answer is accepted, and it stays with the review.
Every review is read by a person before it appears. An email address is required and is confirmed: we send a link to it, and a review does not reach us until the author opens that link, so a review has a sender who was reachable at least once rather than being anonymous. Where what somebody writes needs backing, we ask them for evidence that they used the product, and a review that does not get it is not published. We publish positive and negative reviews alike, we pay nothing and offer nothing for a review, and we accept none that was bought or incentivised.
What we cannot do is verify a purchase. There is no shop here and no account, so whether the author really used the tool rests on their own declaration, on whatever we ask them for, and on the plausibility of what they write. We say so rather than implying a check that does not exist.
A vendor cannot buy a review, and cannot have one removed or changed because they dislike it. We remove or edit a review only if it breaks our rules or the law, for example a false statement of fact. Paid placement has no effect on which reviews appear or on any score.
Where this comes from
Where this comes from
What Sells Next https://whatsellsnext.com/ · checked against the official source on 2026-11-10
ZonGuru https://www.zonguru.com/ · checked against the official source on 2026-11-11
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.