If you sell on Amazon and anywhere else, the hardest number to keep honest is your stock count. A unit sells on Amazon and Shopify within the same minute, both orders go through, and one of them is to a product you no longer have. That is an oversell, and it costs the average seller between $1,500 and $3,000 per incident in refunds, replacement shipping, and lost trust. According to IHL Group’s inventory distortion research, global retail losses from inventory distortion hit $1.7 trillion in 2024, with out-of-stocks driving $1.2 trillion of that. At the seller level, a single oversell typically runs $1,500 to $3,000 in refund processing, replacement shipping, and customer-service overhead, plus the lifetime-value hit from a buyer who probably won’t come back.
Unifystock is inventory management software for Amazon sellers who run more than one channel. It keeps your Amazon stock in step with every other marketplace you sell on, in real time, from a single dashboard, so a unit is never sold twice.
What Unifystock does on your Amazon account
Unifystock connects to Amazon through the official Selling Partner API (SP-API). Every action happens on your own seller account, and your Amazon data is shown only to you.
Real-time inventory sync. When stock changes on any connected channel, Unifystock updates your Amazon availability in seconds, not on a 15-minute or hourly schedule. This is the difference between preventing an oversell and explaining one to a buyer.
Listing management. Create and update Amazon product listings from the same place you manage your other channels, so a catalog change is made once and reflected everywhere.
Order tracking. See Amazon orders alongside the rest of your business, track fulfillment status, and keep your operations in one view instead of switching between Seller Central and every other tab.
Amazon seller analytics and reporting
Unifystock gives Amazon sellers a unified analytics dashboard built on their own account data:
- Sales-trend reporting over time, so you can see momentum, not just today’s number.
- Best-selling product rankings on the Professional plan, across your catalog.
- Channel-mix performance on the Professional plan: how Amazon compares to your other marketplaces.
- Days-of-cover and stockout forecasting on the Professional plan, to plan replenishment before you run out.
- Oversell-risk detection on the Professional plan, flagging SKUs at risk of a negative-balance listing.
- Sync-health monitoring so you can confirm every listing and inventory update landed.
Every metric is computed from your own Amazon data, presented only to your authorized account, and never shared across accounts or with any outside party.
Part of a real multi-channel platform
Amazon is one channel. Unifystock is built for sellers who run several, with native integrations to Amazon, eBay, Shopify, WooCommerce, Etsy, and OpenCart at launch and a roadmap toward broad marketplace coverage. Your store stays the source of truth; Unifystock handles publishing, inventory, orders, and analytics across every channel in real time.
How connecting Amazon works
- Sign in to Unifystock and choose to connect Amazon.
- Authorize Unifystock on your own Amazon Selling Partner account through Amazon’s standard OAuth consent screen. You grant access; you can revoke it at any time from Seller Central.
- Unifystock reads your listings and inventory and keeps them in sync from that point on. No credentials are ever shared or stored in plain text.
Frequently asked questions
Does Unifystock work with Amazon FBA and FBM? Unifystock tracks your Amazon inventory and orders regardless of fulfillment method, so your stock picture stays accurate across FBA and merchant-fulfilled listings.
How fast is the Amazon inventory sync? Inventory and price changes propagate in under three seconds on every plan, which is what closes the gap an oversell lives in.
Is my Amazon data safe? Yes. Unifystock accesses your data only through Amazon’s official Selling Partner API, on your own account, over encrypted connections. Your data is shown only to you and is never sold or shared with third parties. See our Privacy Policy for full detail.
Do I need a separate tool for my other channels? No. Amazon inventory management is one part of Unifystock’s multi-channel platform, so the same dashboard covers your other marketplaces.
What does it cost? Plans start at $49/month with unlimited orders and real-time sync. See our Pricing page for the full breakdown.