Growth tech for the businesses behind marketplace brands
We work with Amazon-first brands, Shopify brands adding Amazon and Walmart, agencies that run Amazon accounts for clients, and 3PLs and prep centers that handle marketplace stock. Each page below covers the operations problems that kind of business usually has, what we build for it and the case studies that show it. Every engagement runs on your own accounts.
Amazon brands
Amazon brand operations partner for US brands: find where revenue leaks, run Growth OS on your own accounts, then add Walmart, TikTok Shop or Target Plus.
Shopify brands
For Shopify brands expanding to Amazon, Walmart and TikTok Shop: when Marketplace Connect is enough, how to keep one stock count and how orders should ship.
Amazon agencies
Custom software and AI agents for Amazon agencies: client reporting portals, bid and budget rule engines, margin dashboards, and when white-label fits better.
3PLs and prep centers
Custom 3PL software for Amazon prep centers: inbound plans, FNSKU labels, Shopify, Walmart and TikTok Shop orders, and per-client billing, on your accounts.
Which kind of business are you?
| Business | The problem it usually has | What we build for it | Built before for |
|---|---|---|---|
| Amazon brands | Amazon is most of your revenue, and a stockout on a best seller shows up in the month's numbers before anyone flags it. | A free 24-hour diagnostic of your Amazon account that shows where revenue leaks, with a dollar estimate where the data supports it. | |
| Shopify brands | Stock sits in a Shopify location, a 3PL and now FBA, and every channel shows a different number, so you oversell on one channel while stock sits idle for another. | One stock ledger across Shopify locations, FBA, WFS and your 3PLs that publishes a buffered quantity to every channel. | |
| Amazon agencies | Account managers rebuild the same client reports every week from Seller Central, the ads console and spreadsheets, and every client wants a different cut. | Client reporting portals on the Selling Partner and Ads APIs, with period comparisons, client logins and history your own system keeps. | |
| 3PLs and prep centers | Client requests arrive by email and phone, and nobody can see a client's stock, shipments and open issues on one screen. | A client portal where sellers add shipments, returns and listings, choose prep services and see their stock, with your team's admin view behind it. |
What does every engagement have in common?
Every engagement starts from Ecomsellertool Growth OS, the base system for listings, orders, inventory, advertising and reporting, deployed on your own accounts. We then build the custom modules and AI agents your operation needs on top, scoped in an architecture doc with a fixed price and go-live date. You keep your accounts, your data and the custom code we build; the Growth OS base is licensed to you. Agencies and software companies that want a platform under their own brand can also license a white-label platform.
Where should you start?
Brands usually start with the free 24-hour diagnostic: connect your Amazon account with Login with Amazon, with no password shared, and get a report of what is going wrong within 24 hours of connecting, on business days. Agencies, 3PLs and prep centers usually start with a call about the workflow that costs them the most time. You can also browse what we have built or read about our services.
Frequently asked questions
Is Ecomsellertool an agency or a software company?
A tech agency that grows ecommerce brands through technology. Instead of renting you people or a subscription, we deploy Ecomsellertool Growth OS on your own accounts and build the custom software and AI agents your operation needs on top.
Do we have to replace the tools we use today?
No. We connect to the marketplaces, ad accounts and 3PL systems you already use and build around the tools that work for you. Whether to retire overlapping subscriptions later is your decision.
Who owns what you build for us?
You keep your accounts, your data and the custom code we build; the Growth OS base is licensed to you. We never buy your inventory or sell under our own accounts.
Tell us about your business. We will show you what we would build.
Enter your email, connect your Amazon account with Login with Amazon, on Amazon’s own consent screen (we only read data; we never change listings, prices, stock or ads), and get a free report of what is going wrong within 24 hours of connecting, on business days. Prefer to talk it through? Schedule a call with the team that built these systems.
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