Amazon Inventory Management Software in 2026: Four Jobs, and the One an AI Agent Can Take
"Inventory management" covers four different jobs, and most Amazon inventory tools do one of them well. This guide separates the jobs, starts with what Seller Central already does for free, dates every price, and says which part of the work an AI agent on your own stock data can already take over, and which part it cannot.
Amazon inventory management software does one of four jobs: it forecasts demand and tells you when to reorder, it keeps stock counts in step across several sales channels, it runs a warehouse or a 3PL relationship, or it puts the stock numbers Amazon already reports in front of an AI agent that watches them for you. Very few products do all four. Buying well starts with knowing which job is the one costing you money today.
For an FBA seller on one marketplace, it is usually the first. For a brand that also sells on its own site, it is the second. Only sellers who store and ship goods themselves need the third. The fourth job is the new one. Most inventory work is watching: days of cover, aging units, shipments that have not checked in. Watching is what seller-side AI agents do well, and deciding how much to order from which supplier is what they still do badly. This guide takes the jobs in turn and keeps that line in view. All prices are per month in US dollars, taken from the vendors' own pricing pages on 10 November 2026. Some vendors only quote on request, and those are marked.
Four jobs that get sold as "inventory management"
- 01Forecast and restockHow much to order, and when, per product
- 02Sync stock across channelsOne count for Amazon, your site and other marketplaces
- 03Run a warehouse or 3PLReceiving, locations, picking and transfers to FBA
- 04Let an AI agent watchDaily checks on stock, velocity and cover, in plain language
Start with what Seller Central gives you for free
Amazon's own inventory tools are better than their reputation, and they are the baseline every paid tool has to beat.
- Restock Inventory. Amazon describes the tool as giving recommendations "based on sales history, plus demand and seasonality forecasts", with a suggested quantity and ship date per product (Amazon, 23 May 2025). You set supplier lead time and reorder frequency yourself.
- The FBA Inventory page and IPI. The same page tracks sell-through, aged and stranded stock, and treats anything above 90 days of supply as excess. Your Inventory Performance Index runs from 0 to 1,000. An Amazon staff post on the Seller Forums in early 2026 says a score of "400 or above helps you maintain healthy storage capacity" and advises against sending in more than you can sell in 60 to 90 days (Seller Forums).
- Capacity Manager. Shows your FBA capacity limit and lets you request more space for fast-moving products.
- AWD auto-replenishment. Amazon Warehousing and Distribution is bulk storage that feeds FBA. With auto-replenishment on, Amazon decides when to move stock into fulfillment centers, and products are "considered in stock and buyable when they're received by AWD" (Amazon, read 10 November 2026). Amazon's supply chain page says the setting saves 10% on AWD storage and avoids FBA storage-utilization, low-inventory and inbound-placement costs (Amazon). Enrolling is free; you pay per cubic foot stored and per box processed.
- Seller Assistant. Amazon's free assistant in Seller Central can investigate stranded inventory and answer questions about the account's stock.
The gaps are consistent. The free tools know nothing about stock in your own warehouse or at your supplier. They do not write purchase orders. They plan one marketplace at a time. And Restock Inventory has no view of your margins, your minimum order quantities or the container you are trying to fill.
A restock tool is only as good as the lead times you gave it.
Kris Krokos
Forecasting and restock planning
What to look for: a forecast per product and marketplace that handles seasonality and past stockouts, lead times and order minimums per supplier, purchase orders you can send from the tool, and stock at every location (supplier, in transit, warehouse, AWD, FBA) on one screen.
- SoStocked. Built for Amazon brands: forecasting with seasonality, purchase order management, reorder and transfer alerts, and receiving at 3PL warehouses. One plan, Inventory + Profit, "starting at $175 per month", with a free trial whose length the page does not state (SoStocked, read 10 November 2026). It is part of Carbon6.
- Inventory Planner by Sage. Forecasts product by product across Amazon, Shopify and other channels, plans purchase orders and buying budgets, and works across several warehouses. Pricing is not published; the page says it depends on how much inventory you manage and is quoted on request (Inventory Planner, read 10 November 2026). A better fit for brands where Amazon is one channel among several.
- Helium 10 Inventory Management. Restock recommendations, forecasting and purchase orders, covering stock at Amazon and in your own warehouse. It is included on the Diamond plan, $359 a month or $279 billed yearly, and not listed on Platinum (Helium 10, read 10 November 2026). Worth it if you already pay for the suite.
- sellerboard. The cheapest paid option here. Its plans run from $19 to $79 a month ($15 to $63 on annual billing), the first month is free, and the feature list includes stock shortage estimates in advance and purchase order planning (sellerboard, read 10 November 2026). It is a profit tool first, so the planning is simpler than in a dedicated forecaster.
A spreadsheet is still a fair answer for a catalog of a few dozen products. The math is daily sales velocity, times lead time plus a safety margin, minus what is on hand and inbound. Software adds doing it for every product, every day.
Multichannel stock sync
What to look for: how fast a sale on one channel lowers the count on the others, whether FBA stock can be offered on other channels through Multi-Channel Fulfillment, and how bundles and kits are counted.
This job has nothing to do with forecasting. It prevents overselling when the same units are listed on Amazon, a webstore and other marketplaces.
- Veeqo. Owned by Amazon since 2021. Its shipping features are free for everyone; inventory sync across channels and demand forecasting sit on the paid Inventory plan, which starts at $19 a month and rises with order volume. FBA orders do not count toward that volume (Veeqo, read 10 November 2026). The lowest-cost way to start for sellers who also ship orders themselves.
- Linnworks. Inventory sync and order management across more than 100 channels, with listing tools for Amazon and eBay. No price is published; quotes are based on order volume, with a one-off onboarding fee (Linnworks, read 10 November 2026).
- Cin7 Core. Inventory, purchasing and order management with channel integrations. Standard $349, Pro $599 and Advanced $1,199 a month, with 2, 4 and 6 ecommerce or app integrations included (Cin7, read 10 November 2026). It is closer to a small ERP than to a sync tool.
If Amazon is your only channel, skip this category. There is nothing to sync.
Warehouse and 3PL
What to look for: receiving and barcode scanning, bin locations, pick lists, and above all a clean way to build and track transfers into FBA or AWD.
- A 3PL's own software. If a 3PL holds your reserve stock, its portal is your warehouse system. ShipBob, for example, quotes every customer individually and offers its warehouse management system to merchants with their own US warehouses (ShipBob, read 10 November 2026). Its pricing page does not mention Amazon, so ask any 3PL directly whether it preps and ships to FBA before you sign.
- Cin7 Core. Standard warehouse management with a mobile app and barcode scanning covers one location; multi-location warehouse management is included on Advanced and an add-on on Pro. A 3PL Connect add-on links outside warehouses (Cin7, read 10 November 2026).
- AWD as the warehouse. For sellers who would rather not run storage at all, Amazon's own bulk storage is the simplest option. Published base rates are $0.48 per cubic foot a month in most regions and $0.57 on the West Coast, plus $1.40 per box in and out, with discounts for Amazon-managed inventory (Amazon, read 10 November 2026). The same pool can feed other channels.
The agent route: an AI assistant that watches your stock
The newest option is not a planning tool at all. Amazon already reports your inventory in detail; the work is in reading it. An AI client such as Claude or ChatGPT, connected to that data, can answer the questions sellers used to build spreadsheets for: which products will run out before the next shipment lands, what is aging toward a storage fee, where velocity changed this month. Run on a schedule, the same questions become a morning check that nobody has to remember to do.
- DataDoe. A data and action layer for Amazon accounts, not an inventory planner. It holds FBA inventory by product and country as daily snapshots, the inventory health report with 7, 30, 60 and 90-day sales windows, aged and excess units and estimated storage fees, Amazon's restock recommendations with their sales velocity, stranded inventory, inbound shipments, and AWD inventory, inbound shipments and replenishment orders, next to orders, ads and fees, in 130+ tables. It answers questions from an AI client and also feeds REST, exports and BigQuery. The price is $97 a month with a 14-day trial (DataDoe platform). DataDoe's guides to inventory velocity and FBA restock planning show the method. It is not forecasting software and not a warehouse system: there is no demand model of its own and no supplier or purchase order module. Its Actions stay off until you enable them, most AI clients ask before a change, and every change is logged.
- Amazon's Selling Partner plugin. Free and first-party for US Seller Central stores, in beta in Claude since 23 September 2026. It reads inventory, sales and traffic and can work on FBA inbound shipments with approval (SiliconANGLE). For one US store this is the place to start.
What an agent can and cannot do with inventory
- It can report days of cover per product, flag stock about to cross an aging threshold, spot a change in sales velocity, and list inbound shipments that are late to check in.
- It can put Amazon's own restock recommendation next to your margin and ad spend, which Restock Inventory does not see.
- It cannot know your supplier's lead time, minimum order or the container you are filling unless you tell it. Those live outside Amazon's data.
- It should not create shipments or change quantities without a person approving each step. The reasoning is in the guardrails section of AI agents for ecommerce.
The agent route suits teams that already know how they want to plan and are tired of exporting reports to do it. It does not replace a forecaster for a brand with long lead times, many suppliers and seasonal products.
Which one do you need?
| Your situation | Start with | Add when |
|---|---|---|
| One marketplace, FBA only, a small catalog | Restock Inventory and the FBA Inventory page | Stockouts keep happening despite the recommendations |
| FBA brand with overseas suppliers and long lead times | A forecasting tool with purchase orders | You need profit next to stock |
| Amazon plus a webstore or other marketplaces | A sync tool; the cheapest covers shipping too | Purchasing gets complex enough for an ERP |
| Own warehouse or a 3PL holding reserve stock | The 3PL portal or a warehouse system | You open a second location |
| Several accounts or marketplaces, an analyst or agency on the team | A data layer with an AI agent watching it | You want forecasts that include supplier data |
One caution applies to all of them: every tool is only as good as the lead times and order minimums you give it. Wrong inputs produce confident wrong reorder dates.
How we chose
We only included tools whose own pages describe the product clearly, and each price carries the day we checked it. We did not count affiliate programs. Tools for finding new products to sell are a different category and are left out. For the wider stack, including profit, advertising and repricing tools, see the best Amazon seller tools by job. Stock planning also depends on listings that stay active and correctly categorized, which catalog hygiene covers.
FAQ
What is the best inventory management software for Amazon FBA?
For FBA-only sellers, start with Amazon's free Restock Inventory tool. If you need forecasts with supplier lead times and purchase orders, SoStocked and Inventory Planner are built for that job, and sellerboard covers the basics from $19 a month.
Does Amazon have its own inventory management software?
Yes. Seller Central includes Restock Inventory, the FBA Inventory page with the Inventory Performance Index, Capacity Manager and AWD auto-replenishment. Amazon also owns Veeqo, a multichannel shipping and inventory tool.
Is there free Amazon inventory management software?
Seller Central's own tools are free, and Veeqo's shipping features are free. Veeqo's inventory sync is a paid plan from $19 a month as of 10 November 2026.
Can an AI agent manage Amazon inventory?
An agent built on ChatGPT or Claude can watch it and reason about it when connected to your account data, through Amazon's free Selling Partner plugin for US stores or a data layer such as DataDoe. They do not replace a forecasting tool that knows your suppliers.
What IPI score do I need?
Amazon staff guidance in early 2026 says 400 or above helps you keep healthy storage capacity. Sell-through, excess stock and stranded listings are the main things that move the score.