Best Multi-Channel Inventory Software (2026)

Multi-channel inventory is two problems wearing one name

The pick. For Shopify and Amazon sellers doing $500K to $10M a year, ReplenishRadar is the best multi-channel inventory software, because it forecasts combined demand across both channels and turns that into reorders and FBA transfers that respect Amazon's limits. Sellers on five or more marketplaces are better served by Linnworks or Sumtracker for the sync. Wholesale plus DTC fits Cin7 or Brightpearl. Choose on two axes: how many channels you sell on, and whether your real problem is forecasting or counts.

That second axis is the one buyers miss, so here is where it comes from. I managed a 200-product catalog across Shopify and Amazon for two years from spreadsheets. Every week at least one product oversold, because I updated the Amazon count twenty minutes after a Shopify sale took the last three units. That was the easy problem. Sync software fixes it and most of the tools below do.

The hard problem was forecasting. A product selling 8 a day on Amazon and 4 a day on Shopify needs 12 a day of supply. I was ordering for each channel separately and could not work out why I kept running short. IHL Group puts U.S. and Canadian retail losses at $350 billion a year to overstock and $145 billion to out-of-stocks, and multi-channel sellers get hit from both sides because the numbers live in different systems.

The channels keep multiplying, too. The U.S. Census Bureau reported retail e-commerce at roughly $1.1 trillion in 2023, about 15.6 percent of all retail, and eMarketer estimates Amazon alone took around 38 percent of U.S. online spending. When close to 40 percent of the market runs through one marketplace and the rest through your own store, forecasting each in isolation stops working.

Twelve tools below, grouped by which of the two problems they solve. I have used or evaluated all of them. Prices are what each vendor published when I checked in early September 2026, and they move.

Quick recommendation

Shopify plus Amazon, 50 to 2,000 products. ReplenishRadar: one forecast across both channels, FBA-aware transfers, and a reorder cadence per supplier. If Shopify is still most of your business, start with the Shopify inventory apps comparison before you shop the broader tools here.

Five or more marketplaces. Linnworks if you have the budget and an operations person. Sumtracker at $59 to $119 a month if you do not.

Wholesale plus DTC. Cin7 for the B2B portal and EDI. Brightpearl if you also run physical stores.

Amazon-only today. ReplenishRadar still, because the day you add Shopify it already knows. SoStocked, now part of Carbon6, plans Amazon well, but it does not forecast Shopify demand, so it stops working the day you add a store.

Leaving Stocky. It shut down on August 31, 2026. The alternatives guide covers the whole replacement field.

Enterprise, 10,000 or more orders a month. Extensiv or NetSuite, and a project plan.

Full comparison table

Tool	Solves	Best for	Channels	Forecasting	FBA planning	Price from	Trial
ReplenishRadar	Forecasting	Shopify + Amazon	2 to 10 stores, any mix	Per product, scored	Inbound plans, receiving per FC	$99/mo, published	14 days
Inventory Planner	Forecasting	Shopify-first catalogs	Shopify + a few	Tunable per product	Reads demand only	About $245/mo, quote	14 days
Sumtracker	Sync, then forecasting	3 to 10 marketplaces	10 channels	On the $119 plan	Stock sync only	$59/mo	Yes
Zoho Inventory	Sync	Small sellers on Zoho	Shopify, Amazon, eBay, Etsy	Manual reorder points	Stock sync only	$29/mo, 500 orders	Yes
Veeqo	Sync and shipping	High-volume shippers	Amazon, Shopify, eBay, Walmart	Yes	Amazon-owned, deep	Free shipping, $19/mo inventory	Yes
Sellbrite	Sync and listings	Listing to many channels	10 or more	No	No	$29/mo	14 days
Linnworks	Sync and operations	Channel sprawl	100 or more integrations	Limited	Basic	Quote, by order volume	Demo
Cin7	Operations	Wholesale + DTC	Many	Basic	Add-on	$349/mo	Demo
Brightpearl (Sage)	Operations	Retail + wholesale	Many	Yes	Limited	Quote	No
Extensiv (Skubana)	Operations	Enterprise, 3PLs	Many	Yes	Yes	Quote	No
Ordoro	Shipping	Shipping first	Several	No	No	$349/mo inventory	15 days
Prediko	Forecasting	Shopify-only DTC	Shopify only	AI, opaque	No	$49/mo under $100k GMV	14 days

The forecasting tools

These decide what you buy. If your stockouts come from ordering too little or too late, start here.

ReplenishRadar: best for Shopify plus Amazon

We built ReplenishRadar for the case most tools handle badly: a seller on both Shopify and Amazon who needs one forecast, not two counts.

It pulls sales history from both channels and forecasts demand across them, so a reorder suggestion is sized for the total 12 a day, not 8 and 4 separately. That sounds basic. Most tools either sync counts without forecasting (Sellbrite, Zoho, Ordoro) or forecast one channel and bolt the other on afterwards. Shopify-led catalogs get the same math through our Shopify forecasting workflow.

The FBA piece is where the gap opens. ReplenishRadar builds transfer recommendations from your FBA stock, warehouse stock, Amazon's capacity limits, and the measured receiving time at each fulfillment center. If you have 500 units in the warehouse and Amazon wants 200 while Shopify needs 150 over the next two weeks, it shows you that sending 300 to FBA leaves your own store short. Then it creates the inbound plan through Amazon's API rather than handing you a number to type into Seller Central.

Pricing. $99 to $499 a month by stores and products, published, month to month. 14-day free trial with everything on.

Not the right fit if you sell on six or more marketplaces and need listing management for eBay, Etsy and Walmart. ReplenishRadar plans Shopify and Amazon. The feature comparison lists what each tier includes.

Inventory Planner: best for Shopify-heavy catalogs with a team

Inventory Planner, now owned by Sage, has been the default Shopify forecasting app for years. Deep forecasting, purchase orders, open-to-buy reports, and settings you can tune per product and per location. If 80 percent of your business runs through Shopify and Amazon is a side channel, it covers you.

Amazon is where it thins out. It reads Amazon demand into the forecast but does not create FBA shipments, track receiving per fulfillment center, or size transfers against capacity limits. Once Amazon is 40 percent of revenue you are managing FBA replenishment by hand next to the tool, which is the job you bought it to do.

Pricing. About $245 a month, quoted by revenue, 12-month contract with auto-renewal. It climbs fast with product count.

Prediko: Shopify-only, cannot see Amazon

Prediko targets Shopify DTC brands that have outgrown spreadsheets: a clean forecasting screen, purchase planning and cash flow projections. It is Shopify-only, so it belongs on this page mostly as a warning. The moment you add Amazon or a second channel, it cannot see half your demand.

Pricing. $49 a month under $100k in sales, then a quote.

The sync tools

These keep one count true everywhere. If your problem is oversells and counts that disagree, start here, and know that most of them will not tell you what to order.

Sumtracker: best cheap sync across marketplaces

Sumtracker keeps stock in step across Shopify, Amazon, eBay, Etsy and Walmart, up to ten channels and ten warehouses. The $59 Manage plan covers the sync, bundles, stocktakes and barcodes for 2,500 orders a year. The $119 Replenish plan adds purchase orders, transfers and a 12-month forecast with reorder suggestions. The Amazon connection is a stock sync, not FBA planning.

For a seller on four marketplaces whose first pain is counts, this is the best value on the page.

Full comparison: ReplenishRadar vs Sumtracker.

Zoho Inventory: cheapest entry, basic planning

$29 a month for 500 orders, then $79, $129 and $249 as volume rises. Connects Shopify, Amazon, eBay and Etsy, builds purchase orders, and lets you set reorder points by hand. Worth it if you already run Zoho Books or CRM, because it shares their login and data. The planning is a number you type and maintain, not one it calculates.

Full comparison: ReplenishRadar vs Zoho Inventory.

Veeqo: Amazon's own, shipping first

Amazon owns Veeqo, so the shipping is free and the Amazon integration is as deep as it gets. Inventory starts at $19 a month by order volume, with stock sync across Amazon, Shopify, eBay and Walmart and a demand forecast. It is built around the packing bench. Purchase ordering is thin and the forecast supports shipping decisions more than buying ones.

Full comparison: ReplenishRadar vs Veeqo.

Sellbrite: best for listing to many channels

If your problem is getting the same product listed consistently on Amazon, eBay, Etsy, Walmart and Shopify, Sellbrite does it cheaply at $29 a month, with quantity sync to stop oversells. It has no forecasting at all. It tells you what you have, never what you will need.

The operations suites

These run the business, and inventory is one module. You buy them for the portal, the EDI, the warehouse, or the accounting, and accept that the planning inside is usually basic.

Linnworks: best for channel sprawl

Shopify, Amazon, eBay, Etsy, Walmart, your own site, and 100-plus integrations behind them. Linnworks centralizes orders, syncs stock everywhere, and prints the labels. It bought SkuVault in 2022, so the warehouse management now lives inside it as SkuVault Core. Forecasting and reorder suggestions exist and are not the point.

Pricing. Quoted by order volume; Linnworks stopped publishing plans. Third-party listings put entry around $199 to $449 a month. Implementation takes weeks on a complex channel setup.

Cin7: best for wholesale plus DTC

Cin7 earns its place when you sell direct and through retailers: B2B portal, EDI for big-box accounts, multi-location warehouses, manufacturing. Setup runs four to eight weeks with an onboarding specialist. At $349 a month to start it is far more tool than a two-person brand on Shopify and Amazon needs, and far less planning depth than the forecasting tools above.

Brightpearl: best for retail plus wholesale

Brightpearl targets mid-market retailers with physical stores and wholesale accounts, with a built-in general ledger and order management. Sage bought it in 2021. The e-commerce inventory features are adequate rather than specialized. For Shopify plus Amazon forecasting it is a generalist competing with specialists.

Pricing. Quote, typically $500 a month and up.

Extensiv: enterprise and 3PLs

Extensiv, formerly Skubana, is where you graduate at thousands of orders a day across warehouses and 3PLs: routing rules, multi-warehouse, deep automation. An NRF Foundation study found retailers running three or more fulfillment nodes carry 18 to 23 percent higher logistics costs, and Extensiv exists to manage that. Custom pricing, expect $1,000 a month and up, and a real implementation.

Ordoro: shipping with inventory attached

Ordoro is shipping software first. The inventory module is a separate $349 a month and does stock sync and order management, not forecasting. Good if labels are your pain. Look elsewhere if buying is.

If you are leaving one of these

Search Console tells me a lot of you land here looking for a way out of a specific tool. Here is the short version for each.

Inventory Planner. Check the renewal date before you start, because the contract is 12 months with auto-renewal. Export your supplier lead times and any per-product settings you tuned. Sales history is in Shopify and Amazon, so forecasts rebuild on their own. ReplenishRadar if Amazon matters to you or you want a published price; Sumtracker's $119 plan if sync across marketplaces matters more than forecast depth. The full comparison.

SkuVault. It is SkuVault Core by Linnworks now, quoted rather than priced, and its strength is the warehouse, not the buying decision. If you kept it for bin-level picking, stay and add a planning layer. If you kept it for the counts, Sumtracker does that for a published $59.

DigitBridge. An omnichannel ERP from $299 a month for one or two users, with an onboarding fee, and 250-plus channel connectors. It is the right size for a brand with a real operations team and the wrong size for a Shopify plus Amazon seller who needs to know what to order. That seller is better on a forecasting tool with two connectors that go deep.

Threecolts Multichannel Pro. A custom-priced enterprise plan for sellers over $1M, bundled with the Seller 365 suite. If what you used was the Amazon-side tools, InventoryLab and the repricer, ReplenishRadar replaces the restock planning and adds Shopify. The rest of the bundle has no equivalent here and you may want to keep it.

The five problems you are actually solving

1. Demand coordination, $20K to $100K a year at risk

Sell 10 a day on Shopify and 20 a day on Amazon and your purchasing has to cover 30. I have watched sellers forecast each channel on its own, order for 25 a day in total, and stock out three weeks early. IHL Group estimates out-of-stocks cost retailers 4.1 percent of annual revenue. On a $2M multi-channel seller that is $82,000.

Run your combined rate through a reorder point calculator and the gap shows up in a minute.

2. Visibility

Each channel shows its own count. You need one view of the warehouse, FBA, any 3PL, and what is in transit. A Shopify study found 73 percent of shoppers expect to buy on one channel and return through another, which only works when the system knows where everything is.

3. Oversells

Without near-real-time sync, selling the last five units on Shopify while someone checks out on Amazon is an oversell. The fixes are sync, a safety buffer per channel, or one pool that decrements everywhere at once. Most tools here sync. The interval matters: a 30-minute sync is not a 5-minute sync when you move 50 units an hour.

4. Allocation

With limited stock, which channel gets it? More at FBA means Prime and the Buy Box. Shopify sales carry a better margin because you skip the referral and FBA fees. There is no universal answer, and a tool should show you the tradeoff in units and dollars rather than leave you to guess.

5. FBA's own rules

Amazon adds layers a DTC-only tool does not know about: capacity limits, inbound placement fees, long-term storage fees, and receiving times that vary by fulfillment center. Jungle Scout's 2023 survey found 82 percent of Amazon sellers use FBA, and Amazon's own report puts third-party sellers at roughly 60 percent of units sold. Seller Central ties your capacity limits to your Inventory Performance Index, so a tool that ignores FBA health metrics is blind to how much you are even allowed to send.

How to decide

Two questions.

How many channels? Shopify plus Amazon, two to ten stores: ReplenishRadar is built for exactly that. Five or more marketplaces with eBay, Etsy and Walmart in the mix: Linnworks or Sumtracker for the sync. Wholesale or physical retail in the mix: Cin7 or Brightpearl for the B2B side.

Forecasting or counts? If the sentence in your head is "my counts do not match across channels", you need sync, and Sumtracker, Zoho, Sellbrite or Linnworks fix it. If it is "I keep stocking out because I do not know when to reorder or how much", you need forecasting, and that is ReplenishRadar, Inventory Planner or Sumtracker's Replenish plan.

For most Shopify plus Amazon sellers carrying 50 to 2,000 products, ReplenishRadar does both jobs in one system: connects both platforms natively, forecasts the combined demand, writes the purchase order, and tells you what to send to FBA and when.

Try ReplenishRadar free for 14 days

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Related Reading:

• Best Shopify Inventory Management Apps
• Multi-Channel Inventory Challenges
• Multi-Channel Inventory Planning
• From Spreadsheets to Software
• ReplenishRadar vs Inventory Planner
• ReplenishRadar vs Sumtracker
• ReplenishRadar vs Linnworks
• ReplenishRadar vs Cin7