Multichannel inventory management software: what keeps stock right across Shopify, Amazon, Etsy and Walmart
Short answer: Multichannel inventory management software keeps one stock count and pushes it to every place you sell, so a sale on Amazon lowers the number shown on Shopify, Etsy and Walmart. For a small seller, Sumtracker, a stock sync tool for Shopify and marketplace sellers, starts at $59 a month as of November 2026. Cin7, a fuller inventory system, starts at $349 a month, and Finale, an inventory system aimed at high-volume sellers, starts at $499. Shopify's own tools cover simple cases. Pick by order volume and channel count first, then by price.
You sell on Shopify, Amazon, Etsy and Walmart, you keep getting oversold or running out on one channel while stock sits on another, and you want to know what fixes that and what it costs.
I'm Ranjit, and I run Blur Studio: 15+ years building software, 120 apps taken live, and clients who have gone on to raise $10M+. I build AI systems and processes that help businesses do a lot more with a lot less time. I also work differently from most of what else is out there, more on that further down this page. Say hello.
What does multichannel inventory software actually do?
It does three jobs across your online shops and marketplaces, such as Amazon (a very large online marketplace), Etsy (a marketplace for handmade and vintage goods) and Walmart (the big retailer's third party marketplace). It keeps one master count of each product, called a SKU (a stock keeping unit, one line in your catalog such as "blue mug, large"). It updates every sales channel when that count changes. And it pulls orders from every channel into one place so someone can pack and ship them.
The main problem it solves is overselling. That is when two channels both show a product in stock, two customers buy the last unit within minutes, and one of them gets a cancellation. Marketplaces may track cancellations in your seller metrics, so check each one's seller rules, and on any channel they can hurt reviews.
The common challenges are plain ones. Bundles and multipacks need their parts counted. Stock held at Amazon FBA (Fulfilled by Amazon, where Amazon stores and ships for you) is counted separately from stock in your own room. Returns come back late. Suppliers send partial deliveries. A good tool handles most of this. None of them handle all of it.
Does Shopify have inventory sync?
Shopify, the hosted online store platform, tracks stock per location and supports transfers, stock counts and purchase orders from the admin. That covers your own store well. For other marketplaces, Shopify offers an app called Marketplace Connect, which syncs orders, listings and inventory with Amazon, Target Plus (Target's online marketplace), Walmart and eBay (an online marketplace for new and used goods). Shopify's help pages say new Etsy connections can't be made with that app at this time, so an Etsy seller needs a different route.
On its Shopify App Store listing, Marketplace Connect shows the first 50 marketplace-synced orders a month free, then a 1 percent fee per additional synced order, capped at $99 a month (as of November 2026). If you sell a few hundred marketplace orders a month and use mainly Amazon or Walmart, this may be all you need. If you want Etsy, or you want one count across FBA and your own stock, look at the tools below. I covered what usually breaks in a Shopify and Amazon sync that stops working and in a Shopify and Etsy sync that stops working.
How do you pick the right tool?
Ask four questions before you look at a price page.
- How many orders a year? Many tools price by order volume, not by seats.
- How many channels? Some plans cap the number of connected channels or integrations. Count Shopify, Amazon, Etsy, Walmart and your accounting tool.
- Where is stock? One room, several rooms, FBA, or a 3PL (a third party logistics company that stores and ships for you)?
- Do you buy from suppliers? If you reorder often, you want purchase orders and reorder suggestions, not only sync.
Which tools compare, and what do they cost?
Prices below are from each vendor's own pricing page, in US dollars, as of November 2026. Check the page before you buy, because vendors change plans.
| Tool | What it is | Starting price | Fits |
|---|---|---|---|
| Sumtracker | Stock sync tool for Shopify and marketplace sellers | $59 a month ($50 on annual billing) up to 2,500 orders a year | Small and mid-size sellers who mainly need sync |
| Cin7 Core | Inventory system with orders and purchasing, and an optional B2B portal | $349 a month | Growing sellers with suppliers and wholesale |
| Finale | Inventory system for multichannel and multi-warehouse sellers | $499 a month | High-volume sellers with FBA or several warehouses |
| Linnworks | Order and inventory platform for marketplace sellers | Quote only | Larger sellers who ship many orders a day |
The best multichannel inventory software, tool by tool
Sumtracker
Sumtracker is a stock sync tool for sellers on Shopify and marketplaces. Its Manage plan covers multichannel sync, bundles, stock counts, barcode scanning and API access. The price scales with yearly orders. On monthly billing, Manage runs $59 up to 2,500 orders, $119 up to 10,000, $179 up to 25,000 and $249 up to 50,000. Annual billing brings those to $50, $100, $150 and $209. The Replenish plan adds purchase orders, stock transfers and 12 month forecasting, and starts at $119 a month. Both plans allow up to 10 sales channels and 10 warehouses, and there is a 14 day free trial. It has a setting to cap the quantity shown for a SKU on eBay and Etsy, which helps with scarcity and overselling.
- Best for: A Shopify-led seller who mostly needs the count to stay right, without a full inventory system.
Cin7 Core
Cin7 is an inventory and order system, and its pricing page lists three plans for new customers. Standard is $349 a month with 5 users, 2 ecommerce and app integrations and 6,000 sale orders a year. Pro is $599 with 10 users, 4 integrations and 24,000 orders a year, and adds material requirements planning (a tool for planning raw parts for products you make). Advanced is $1,199 with 15 users, 6 integrations, 120,000 orders and advanced warehouse features. More integrations, users and volume can be bought as extras. See my breakdown in Cin7 pricing and Cin7 integrations.
- Best for: Sellers who also run wholesale, buy from suppliers and want one system for all of it.
Finale
Finale, now part of Descartes, is an inventory system with 40 plus integrations including Shopify, Amazon, Walmart and QuickBooks (accounting software). Essentials starts at $499 a month and Growth at $799. Growth adds a mobile barcode scanning module. Enterprise is quoted. Finale says teams go live in 2 to 6 weeks. If you are weighing it against a similar system, my Fishbowl alternatives guide compares several (Fishbowl is another inventory system).
- Best for: High-volume sellers with FBA or more than one warehouse.
Linnworks
Linnworks is an order and inventory platform that connects to 100 plus channels. It does not publish prices. Its pricing page says plans are priced on order volume, not revenue, with add-on modules and guided onboarding in every package. You need a quote.
- Best for: Larger sellers with complex shipping rules. See my Linnworks alternatives page for lighter options.
Zoho Inventory
Zoho Inventory is the stock tool from Zoho, a business software maker. It has a free plan and paid plans by orders a month, users and locations. Standard allows 500 orders a month, 3 users and 2 locations, and Premium allows 3,000 orders, 5 users and 4 locations. It lists Amazon, Etsy and Shopify integrations. Prices show in your local currency, so check Zoho's pricing page for your own number.
- Best for: Very small sellers who want a low-cost start.
Worked example: 8,000 orders a year on three channels
These figures are made up to show the method. Say a seller ships 8,000 orders a year across Shopify, Amazon and Etsy, and buys from two suppliers.
- Sumtracker Manage: 8,000 orders falls in the up to 10,000 tier, so $119 a month, or $100 on annual billing. About $1,200 to $1,430 a year. Add the Replenish plan ($179 or $150) if purchase orders matter.
- Cin7: Standard covers 6,000 orders a year, so this seller lands on Pro at $599 a month, about $7,200 a year, partly because 3 channels may also need more than Standard's 2 integrations.
- Finale: From $499 a month, about $6,000 a year, before you check whether your volume and channels fit the starting plan.
The sync tool is far cheaper, but it does less. If your pain is overselling, start there. If your pain is also suppliers, wholesale and warehouse work, the bigger systems earn their price.
When a custom layer on top beats a full switch
Many sellers do not need a new system. They need one or two extra things on top of a sync tool they already have. These are the gaps I see most:
- Supplier feeds: your supplier sends a spreadsheet or email with stock and cost. A small script reads it and updates your counts or marks items as backordered.
- A profit view: real profit per SKU per channel after fees, shipping and ad spend. Most sync tools show revenue, not profit. See my Amazon seller profit calculator for the fee math.
- Alerts: a message when a SKU is down to 7 days of stock, or when a channel stops syncing.
This is the build versus buy question. I wrote about how to decide in build vs buy software, and the general case for a system of your own in inventory management systems. Automating the count itself is a solved problem. Automating the judgment around it, such as when to reorder, is where AI helps, and AI for Amazon sellers covers that side.
How I'd approach this
I would not start by comparing price pages. I would pull twelve months of orders and count three things: orders a year, channels, and how many times you were oversold or stocked out. If you were oversold fewer than ten times and sell mostly on Shopify, use Shopify's tools or a sync tool like Sumtracker and stop there.
If you buy from suppliers weekly, ship from more than one place, or sell wholesale too, go to a full system such as Cin7 or Finale. Trial it with two weeks of real orders before you commit.
Whatever you pick, expect one gap. It is usually the profit view or the supplier feed. Fill that gap with something small and owned, not with a bigger plan.
Questions people ask
What is the best multichannel inventory management software for a small business?
It depends on volume. A Shopify-led seller with a few thousand orders a year can start with a sync tool such as Sumtracker at $59 a month as of November 2026. A seller with suppliers and wholesale usually needs a fuller system such as Cin7 from $349 a month. Count your orders and channels first, then compare plans.
Does Shopify have inventory sync?
Shopify tracks stock per location natively. For marketplaces, its Marketplace Connect app syncs inventory and orders with Amazon, Target Plus, Walmart and eBay. Shopify's help pages say new Etsy connections can't be made with that app. See the inventory management system guide for when native tools stop being enough.
Can multichannel inventory management be automated?
Yes, the count and the sync can run on their own. Reorder timing, bundles and supplier data usually still need rules you set, and a person should check any automatic purchase order. If you want to try this yourself, read business process automation first.
What are the biggest multichannel inventory challenges?
Overselling, stock at FBA versus your own room, bundles, late returns and supplier delays. Most come from stock counts that update slowly or from data entered by hand in two places. Fix the update speed first, then the handoffs.
When is a custom layer better than a bigger plan?
When the gap is small and specific, such as a supplier feed, a profit view or an alert. A bigger plan costs every month and still may not fill it. Read build vs buy software to weigh it.
More in this topic: Ecommerce: inventory, forecasting and stock (22 guides) →