Best for
Best for Amazon sellers and agencies whose main workload is advertising, with research and listing checks alongside.
E-commerce Seller Tools Comparison
SellerApp 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 | SellerApp | ZonGuru |
|---|---|---|
| Starting price | lower value Freemium free; Pro from $99 / month The pricing FAQ states a yearly plan saves 50% against monthly billing; yearly amounts are not shown. Smart is $149 a month for the first 3 months, then $250. | From $124 / month, billed annually Starter is $1,490 a year billed annually, or $149 a month billed monthly. |
| Free trial | Freemium plan with limited access, no credit card required | Free AI Readiness Score for a live listing |
| API | Paid Amazon data APIs for products, keywords, listing quality, FBA fees and profit, with a key issued on subscribing and 100 free tokens to start | MCP access for AI tools on every plan, and an SP-API connection to Seller Central |
| Hosting | Cloud: a web app and a browser extension | Cloud: web app |
| Product research | Product research and product intelligence, ASIN tracking of historical pricing, sales estimates, revenue trends and listing quality over time, and a browser extension that shows data on Amazon product pages | Not stated |
| Marketplace keyword research | Keyword Explorer for keyword research and a keyword tracker that monitors rankings; keyword tracking is part of the Pro plan | Not stated |
| Listing optimisation | Listing Quality Index (LQI) analysis of Amazon listings across 6 to 7 areas; listing optimisation and creation is also sold as a managed service per parent ASIN | 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 | Competitor research, and ASIN tracking that follows any product's pricing, sales estimates and listing quality over time | Not stated |
| Fee and profit calculation | Profit and loss tracking at every level of the account, plus FBA Fees and Amazon Profit Calculator APIs | Not stated |
| Marketplaces covered | Amazon; the pricing page lists US, CA, MX, BR, DE, ES, FR, IT, NL, PL, SE, TR, UK, SA, AE, AU, IN, JP and SG, while its FAQ names 15 of these | Amazon US, UK, Canada and Australia |
| Integrations and API | Paid APIs for product details, best sellers by category, category tree, reviews, keywords, keyword tracking, indexing, listing quality, FBA fees, profit, storefronts and search results; pricing is usage-based and on request | 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 |
| Support | Email helpdesk, Chat | Not stated |
| Onboarding | Personal consulting | Not stated |
| Integrations | Browser extension | Amazon Seller Central |
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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 SellerApp Freemium free; Pro from $99 / month ZonGuru From $124 / month, billed annually
- Free trial SellerApp Freemium plan with limited access, no credit card required ZonGuru Free AI Readiness Score for a live listing
- Hosting SellerApp Cloud: a web app and a browser extension ZonGuru Cloud: web app
- MCP-ready SellerApp No ZonGuru Yes
- API SellerApp Paid Amazon data APIs for products, keywords, listing quality, FBA fees and profit, with a key issued on subscribing and 100 free tokens to start ZonGuru MCP access for AI tools on every plan, and an SP-API connection to Seller Central
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
SellerApp
Strengths
- Freemium plan with no credit card required
- Advertising automation and research in the same account
- Listing Quality Index analysis of Amazon listings
- Documented Amazon data APIs, starting with 100 free tokens
Limitations
- Yearly prices are not shown, only a stated 50% saving
- Smart is discounted only for the first 3 months, then $250 a month
- API pricing is on request
- Agencies pay 0.5% to 2.5% of Amazon ad spend on top of the base fee
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
SellerApp
- Freemium $0 For sellers getting started on Amazon. Basic functionalities including product research; no credit card required.
- Pro From $99 / month Adds insights and tracking, keyword tracking, listing quality and email support.
- Smart From $250 / month $149 a month for the first 3 months. Adds ads automation, a quarterly business review, email and chat support, a dedicated account manager and custom development.
- Custom On request Smart plan plus data warehousing, custom development, a product solution expert and priority support.
- Agency $300 plus 0.5% to 2.5% of Amazon ad spend Agency program with ad automation, multiple accounts and reporting; the FAQ calls $300 a starting sum and states no minimum duration.
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
SellerApp
- 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
SellerApp https://www.sellerapp.com/ · checked against the official source on 2026-11-11
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.