Best Shopify Inventory Management Apps in 2026

Shopify tells you how many units you have. It does not tell you when to order more.

That gap costs money. A seller I know ran out of her top product for 11 days last Q4. She had the supplier relationship. She had the cash. She just did not know she needed to order until the listing went to zero. Eleven days of lost sales during peak season because Shopify showed her the count and nobody showed her the trajectory.

Every app on this page exists to close that gap. Ten of them, plus a note on the one that shut down, compared on the things that decide whether you stock out: does it forecast, does it build the purchase order, does it know about Amazon, and does it tell you the price.

Start a free 14-day trial and see which of your products run out first. Or get a free inventory health report without committing to anything.

How I picked

I have run a 200-product catalog on Shopify and Amazon, first from a spreadsheet and then from three of the apps below. For this comparison I installed or demoed every app that was still alive in September 2026, read the pricing page rather than the sales deck, and scored each one on the same six things. Forecasting you can inspect. Purchase orders with your supplier's minimums and case sizes built in. Amazon support that goes further than reading orders. Setup you can do yourself. A price on the website. And whether the company is still shipping, because this category has lost Stocky, Genie and Cogsy in fourteen months.

Prices are what each vendor published when I checked, in early September 2026. They move. Check before you buy.

The comparison

App	Best for	Forecasting	Purchase orders	Amazon	Price from	Setup
ReplenishRadar	Shopify + Amazon, 50 to 50,000 products	Per product, scored against actuals	Yes, with MOQ and case math	Native, builds FBA inbound plans	$99/mo	About 10 min, self-serve
Stockful	Shopify-only on a budget	Self-tuning, reorder points	Yes	No	$19.99/mo	Self-serve
Inventory Planner	Big Shopify catalogs with a team	Tunable per product	Yes	Reads demand, no FBA plans	About $245/mo, quote	Sales call
Prediko	Shopify-only DTC brands	AI, cannot inspect	Yes	No	$49/mo under $100k GMV	Self-serve
Fabrikatör	Shopify-only, bundles	Yes	Yes	On request	$79/mo billed yearly	Self-serve
Sumtracker	Sync across 3 or more marketplaces	On the $119 plan	On the $119 plan	Stock sync only	$59/mo	Self-serve
Katana	Makers who assemble products	Basic	Yes, plus manufacturing orders	Stock sync on Core, no FBA plans	Free to 30 SKUs, then $299/mo	Days
Zoho Inventory	Small sellers already on Zoho	Reorder points	Yes	Order and stock sync	$29/mo, 500 orders	Self-serve
Veeqo	Shipping first, Amazon-owned	Yes	Limited	Deep, it is Amazon's	Free shipping, $19/mo inventory	Self-serve
Cin7	Wholesale + DTC	Basic	Yes	Add-on	$349/mo	1 to 8 weeks
Stocky	Shut down August 31, 2026

The table gets you oriented. The sections below are where the differences live, and the scored breakdown further down puts numbers on them.

ReplenishRadar: best for stores that also sell on Amazon

Full disclosure: this is our product.

We built it because I kept solving the same problem in a spreadsheet: what do I order, when, and how much goes to FBA versus my own warehouse? After the third time a formula error caused a stockout on a best-seller, I stopped trusting the spreadsheet.

Here is what it does. It connects to your store through Shopify's app install, reads products, orders and stock, and writes back only a stock quantity, only when you receive a purchase order or move stock yourself. Then it builds a demand forecast for every product. Not one model for the whole catalog. Each product is classified by how it sells, steady or seasonal or lumpy, and gets the model that fits. Every forecast is scored against what actually sold, so you can see which products it predicts well and which ones need a human look.

From there it works out days to stockout from current stock, sales rate and each supplier's real lead time, measured from your purchase order history rather than the number you typed in six months ago. When a product crosses its reorder point, you get a suggested quantity already rounded to the supplier's minimum and case size.

If you also sell on Amazon, the FBA side is native. It creates inbound plans through Amazon's own API, suggests transfer quantities that respect your capacity limits, and tracks how long each fulfillment center takes to receive, so you know that one warehouse checks in shipments in 4 days and another takes 12. A spike on Shopify does not drain the stock you needed for FBA, because both channels are planned from one number.

Purchase orders carry the constraint math through to the supplier, and the supplier scorecard shows which vendors deliver on time and which are quietly slipping.

Pricing. $99 a month (Standard: 2 stores, 2,000 products), $199 (Growth: 5 stores, 20,000), $499 (Scale: 10 stores, 50,000). Month to month, published, and those are launch prices through December 31, 2026. See the pricing page.

Where it does not fit. A Shopify-only store under 30 products with one fast supplier. At that size the Admin's own screens or a spreadsheet work. It also does not do manufacturing, EDI or a wholesale portal. That is Cin7's territory, or Katana's if you assemble what you sell.

Stockful: best Shopify-only app on a budget

Stockful is the app that grew fastest out of Stocky's shutdown, and it earned it. Forecasting with reorder points and safety stock, purchase orders, transfers between locations, and daily stock snapshots so you can see how a count changed over time. Every feature is on every plan. Starter is $19.99 a month for 2,000 products and one location, Growth $39.99 for 7,500 products and five locations, Pro $79.99 for 15,000 and ten. It imports your Stocky data, which matters if you are one of the stores that never exported before the deadline.

The limit is the one that limits most of this list. It is Shopify-only. No Amazon, no marketplaces. If Shopify is your whole business, that is fine, and at $19.99 it is the cheapest real forecasting on this page.

Best for: Shopify-only stores under 2,000 products that want forecasting and purchase orders for the price of a lunch.

Inventory Planner by Sage: best for big catalogs with a team

Inventory Planner has been around longer than anything else here, and it shows in the depth of the settings. You can tune the forecast per product, per variant, per location. For a 500-product Shopify catalog with someone whose job is to manage those settings, it delivers.

The tradeoffs are real. Pricing moved to revenue-based quotes after Sage bought it. The floor is about $245 a month, but you will not see a number until you hand over your business name, revenue and contact details, and the contract is 12 months with auto-renewal. That is a lot of commitment before you have seen your own data in it.

Amazon support exists but stops short. It reads Amazon demand into the forecast. It does not create FBA inbound plans, track receiving times per fulfillment center, or size transfers against capacity limits. Sell on both and you end up running a second tool for the Amazon half.

Setup goes through a sales process and then guided onboarding. Some App Store reviews describe sync issues afterwards that throw the forecast off.

Full comparison: ReplenishRadar vs Inventory Planner.

Best for: Shopify-first sellers with 500 or more products, a person to own the configuration, and no need for FBA planning.

Prediko: Shopify-only with a forecast you cannot inspect

Prediko is clean, quick to set up, and cheap for small stores at $49 a month under $100k in sales.

What gives me pause is the black box. Prediko calls its forecasting AI and does not show you which model it used, what pattern it saw in your sales, or how it treated the outliers. When it says order 500 units, you trust it or you do not. There is no way to check the reasoning, and a forecast you cannot check is a forecast you cannot improve.

It is also Shopify-only. No Amazon, no marketplaces. And above $100k in sales the price becomes a quote, which is odd for a product that sells itself on simplicity.

Full comparison: ReplenishRadar vs Prediko.

Best for: Shopify-only stores under $100k in sales that want the lowest friction and are fine trusting a number they cannot audit.

Fabrikatör: Shopify-only, strong on bundles

Fabrikatör does forecasting, purchase orders and, unusually, bundle planning: if you sell kits assembled from components, it plans the components. Backorders are built in at 75 cents an order. Pricing is by your revenue, $79 a month billed yearly under $500k, then $149 and $350 a month as you grow, with a 14-day trial and a 30-day money-back guarantee.

It is a Shopify app and prices per store. Amazon is available on request rather than on the pricing page, which in my experience means a conversation and a wait.

Best for: Shopify-only brands that sell bundles or kits and want the component math handled.

Sumtracker: best if you sell on three or more marketplaces

Sumtracker's job is keeping one stock count true across Shopify, Amazon, eBay, Etsy and Walmart, up to ten channels and ten warehouses. The $59 Manage plan does the sync, bundles, stocktakes and barcodes for up to 2,500 orders a year. Forecasting, reorder suggestions, purchase orders and transfers arrive on the $119 Replenish plan.

Note what the Amazon connection is: a stock sync. It does not build FBA shipments or plan what to send where. If your pain is oversells across marketplaces, Sumtracker fixes it well. If your pain is deciding what to order, you are on the $119 plan and the forecasting is simpler than the apps built around it.

Full comparison: ReplenishRadar vs Sumtracker.

Best for: Sellers on three or more marketplaces whose first problem is stock counts that disagree.

Katana: for makers who assemble what they sell

Katana is manufacturing software with an inventory layer, and that is the reason to pick it or skip it. Bills of materials, production orders, and stock of both the components and the finished goods. The free plan covers 30 products with unlimited users and locations and connects to Shopify. Core is $299 a month with unlimited products, and that is the plan that adds an Amazon FBA stock connection. A connection, not planning: it does not build the shipment.

If you buy finished goods and resell them, you are paying $299 for a factory floor you do not have. If you make what you sell, nothing else on this list understands your stock.

Full comparison: ReplenishRadar vs Katana.

Best for: Brands that manufacture or assemble their own products.

Zoho Inventory: cheapest multi-channel, basic planning

Zoho Inventory is $29 a month for 500 orders, then $79, $129 and $249 as your order volume rises. It connects Shopify, Amazon, eBay and Etsy, does purchase orders, and lets you set reorder points by hand. It is the one to look at if you already live in Zoho Books or Zoho CRM, because it shares their login and their data.

The planning is basic. Reorder points are numbers you set and maintain, not numbers it calculates from your sales, and there is no lead-time learning. Amazon is order and stock sync, not FBA planning.

Full comparison: ReplenishRadar vs Zoho Inventory.

Best for: Small multi-channel sellers already on Zoho who want one bill.

Veeqo: free shipping software with inventory attached

Amazon owns Veeqo, which explains both the price and the strength. Shipping is free. The inventory plan starts at $19 a month, scaled by order volume, and includes stock sync across Amazon, Shopify, eBay and Walmart plus a demand forecast. The Amazon integration is as deep as you would expect from the owner.

It is a shipping tool first. The inventory features support the packing bench rather than the buying decision, and the purchase-order side is thin. If most of your day is labels, start here. If most of your day is deciding what to order, it will not carry that.

Full comparison: ReplenishRadar vs Veeqo.

Best for: High-volume shippers who want free labels and a stock count that matches everywhere.

Cin7: for wholesale plus DTC

Cin7 is an operations suite that happens to include inventory: a B2B portal, EDI for big retailers, manufacturing with bills of materials, warehouse management, point of sale. Standard is $349 a month for five users, Advanced $1,199 for fifteen, and reviewers describe implementations of four to eight weeks for small teams.

The planning layer, the forecasting and reorder suggestions, is a feature inside a much bigger system rather than its reason for existing. If your problem is "when do I reorder my top 200 products", you are paying for portals and EDI you will never open.

But if you sell wholesale and direct, with EDI partners and a B2B portal and maybe your own production? Cin7 handles that combination better than anything else here. We do not do EDI or manufacturing. Neither does anyone else on this page except Katana.

Full comparison: ReplenishRadar vs Cin7.

Best for: Brands with wholesale accounts, EDI requirements or manufacturing alongside their Shopify store.

The ones that are gone

Stocky shut down on August 31, 2026. Shopify delisted it in February, had already stripped transfers, min/max forecasting and replenishment out of it in July 2025, and pointed merchants to the Admin's own inventory screens, which count stock and do not plan it. If you were on it and did not export, Stockful can rebuild from your Shopify history. Our Stocky alternatives guide and the ReplenishRadar vs Stocky page cover the migration.

Genie sunset in August 2025. Cogsy was discontinued and folded into Mayple. Two planning apps gone in a year is worth remembering when you weigh a low price against whether the company will exist next renewal.

The detailed comparison

Skim the summary table for orientation. Read this one to decide.

Capability	ReplenishRadar	Stockful	Inventory Planner	Prediko	Sumtracker	Cin7
Starting price	$99/mo published	$19.99/mo	About $245/mo, quote	$49/mo under $100k GMV	$59/mo, $119 with forecasting	$349/mo
Contract	Month to month	Month to month	12 months, auto-renew	Month to month	Month to month	Varies
Trial	14 days, no call	14 days	Demo-led	Yes	Yes	Demo-led
Setup	About 10 min	Self-serve	Days to weeks	About 15 min	Self-serve	1 to 8 weeks
Amazon	Native, first-class	No	Demand data only	No	Stock sync	Add-on
Creates FBA inbound plans	Yes	No	No	No	No	No
Receiving time per fulfillment center	Yes	No	No	No	No	No
Forecasting	Per product, pattern-classified	Self-tuning	Tunable per product	AI, opaque	12-month, on Replenish plan	Basic
Forecast scored against actuals	Yes	Not shown	Not primary	No	No	No
Safety stock	From lead-time variance	Yes	Configurable	AI-set	Basic	Manual
MOQ and case-pack rounding	Automatic	Partial	Manual or limited	Limited	Partial	Partial
Supplier lead time	Measured from PO history	Entered	Entered	No	Entered	Entered
Purchase orders	Yes, constraint math	Yes	Yes, detailed	Yes	Replenish plan	Yes
Stores on one account	2, 5 or 10, any mix	1 to 10 Shopify locations	Shopify-focused	Shopify only	10 channels	Many
Manufacturing	No	No	No	No	No	Yes
AI agent access (MCP)	50 tools, open protocol	No	No	Closed chatbot	No	No

Scored feature breakdown

Numbers tell a cleaner story than paragraphs. Each app is scored 1 to 5 on the things that decide a Shopify seller's stockouts. A 5 is a real strength. A 1 barely exists. A 0 is not offered.

Capability	ReplenishRadar	Stockful	Inventory Planner	Prediko	Sumtracker	Cin7
Demand forecasting	5	3	4	3	2	2
Forecast transparency	5	3	4	1	2	2
Amazon FBA support	5	0	2	0	2	3
FBA inbound planning	5	0	0	0	0	0
Purchase order workflow	5	4	5	4	3	4
Supplier tracking	5	2	3	1	2	3
Multi-store support	5	2	3	1	5	4
Safety stock math	5	3	4	2	2	2
Setup speed	5	5	2	4	4	1
Pricing transparency	5	5	1	3	5	2
Manufacturing	0	0	0	0	0	5
Total, out of 55	50	27	28	19	27	28

Notes on the scoring. Stockful and Sumtracker tie with Inventory Planner on points and cost a fifth as much, which tells you where Inventory Planner's money goes: depth of forecast tuning, which you only collect on if someone tunes it. Prediko gets a 3 on forecasting because the numbers come out, and a 1 on transparency because you cannot see how. Cin7 scores respectably and half its points are manufacturing and multi-channel features a Shopify-first seller never opens.

McKinsey's research puts the error reduction from model-driven forecasting at 30 to 50 percent over manual methods. That only helps if you can see what the forecast is doing. A black-box model that is wrong 40 percent of the time is worse than a transparent one that is wrong 30 percent, because you can fix the second and only argue with the first.

Which app for your store

I talk to Shopify sellers every week. The answer turns on two facts: how many channels you sell on, and how many products you carry.

Shopify-only, under 50 products

You do not need an app yet. The Admin tracks stock and moves it between locations. Run your reorder math through our reorder point calculator once a month. When that starts taking more than half an hour a week, come back to this page.

Shopify-only, 50 to 500 products

Stockful or ReplenishRadar. Stockful at $19.99 if you want forecasting and purchase orders and nothing more. ReplenishRadar at $99 if you want to see why it recommends a quantity, want your supplier's lead times measured instead of typed, or think Amazon is in your future. Either way you need forecasting at this size. Reorder points you set by hand stop working past 50 products because you cannot hold every product's sales rate in your head.

Shopify-only, 500 or more products

ReplenishRadar or Inventory Planner. Both have mature forecasting. Inventory Planner gives finer per-product tuning if you have a person to do the tuning. ReplenishRadar is running the same afternoon, the price is on the website ($199 Growth against a quote), and ordering cadence and supplier scorecards keep the buying side moving without a spreadsheet. Our Shopify forecasting guide walks through how per-product models keep a long tail accurate, and the Shopify Plus page covers the scale-specific workflows.

Shopify plus Amazon

ReplenishRadar. This is not close. Nothing else on this page creates FBA inbound plans through Amazon's API, tracks receiving time per fulfillment center, or sizes transfers against your capacity limits. Two planning tools means two forecasts that do not know about each other. One inventory view plans both.

Shopify plus three or more marketplaces

Sumtracker for the sync, on the $119 plan if you want its forecasting, or Sumtracker's $59 plan under ReplenishRadar or Inventory Planner for the planning layer. Sumtracker keeps the counts agreeing so you do not oversell. The planning tool says when to reorder and how much.

Wholesale plus DTC

Cin7. If you have wholesale accounts, EDI partners or production alongside your Shopify store, nothing else here handles the combination. You will pay $349 and up and spend weeks implementing, and the alternative is three tools taped together. Read the full Cin7 comparison first to be sure you need the wholesale half.

Coming off Stocky

It is gone. Your sales history is in Shopify, so any app here rebuilds forecasts from it. What you lost is purchase order history and supplier settings, unless you exported. Stockful imports Stocky exports. ReplenishRadar connects in ten minutes. Here is the migration guide.

Switching apps: what it actually involves

Picking the right app is half the job. Getting off the wrong one is the other half, and it is less scary than it looks, because your sales data was never in the app. It is in Shopify.

From Stocky. The easiest move. Anything you exported before August 31, purchase orders and supplier records, imports into Stockful directly and into most others as a spreadsheet. Anything you did not export is gone, and your forecasts rebuild from Shopify regardless. Budget an afternoon.

From Inventory Planner. The friction is the 12-month contract with auto-renewal, so check the renewal date before you start. Export supplier lead times and any per-product forecast settings you tuned. That is real work you do not want to redo. Forecasts rebuild from Shopify and Amazon automatically. The detailed comparison lists every feature gap.

From Cin7. The hardest, because Cin7 runs operations, not only inventory. If you use it for B2B orders, EDI or manufacturing you probably keep it and add a planning layer on top. Some sellers run Cin7 for fulfillment and ReplenishRadar for forecasting and reorder math. Leaving entirely, budget two to four weeks and export purchase orders, suppliers and locations. The Cin7 comparison has the full map.

From SoStocked. SoStocked, now part of Carbon6, plans Amazon well but does not forecast Shopify demand. If you have added a Shopify store, that is the gap: ReplenishRadar covers the same FBA restock workflows with native Amazon integration and adds the Shopify forecasting SoStocked does not do. The comparison.

From a spreadsheet. Honestly the easiest of all. Nothing to export. Connect the store, let the app pull one to two years of sales (a few hundred products takes a few hours, a few thousand can take a day), and enter your supplier lead times and minimums. That is the whole migration.

What Shopify's own tools cover

The Admin handles the basics: quantity by location, transfers between locations, low-stock notifications, and simple purchase orders. Since Stocky's shutdown, Shopify has folded a few of its screens into the core.

What it does not do: demand forecasting, reorder points, safety stock, supplier lead time tracking, or a restock suggestion based on how fast a product sells. Run several Shopify stores and it does not coordinate stock between them either.

The line between tracking and planning is where stockouts happen. Tracking says what you have now. Planning says what you will need in three weeks. Auburn University's RFID Lab puts average retail inventory accuracy at 65 percent, and a seller juggling Shopify and Amazon is making reorder decisions on numbers that are probably wrong in at least one channel.

Every app on this page exists because Shopify chose to stay on the tracking side of that line.

The real cost of getting this wrong

Inventory software is not cheap. A stockout is more expensive. A store doing $50k a month that runs out of a top-three product for one week loses roughly $4,000 to $6,000 in direct sales, before the Amazon ranking damage, the ad spend sent to a dead listing, and the sales that never come back. A widely cited Grocery Manufacturers Association study by Gruen, Corsten and Bharadwaj found that 31 percent of shoppers who hit an out-of-stock buy the same product from a competitor. Online, switching stores takes two clicks, not a car trip. That 31 is probably low for us.

IHL Group put the global number at $1.77 trillion in inventory distortion in its 2025 study: $1.2 trillion of out-of-stocks and $554 billion of overstock. The mid-market absorbs a disproportionate share, the stores doing $500K to $10M a year, because they are too big to eyeball and have never had the forecasting the big retailers built decades ago.

Overstock is quieter and about as expensive. ASCM estimates carrying cost at 20 to 30 percent of inventory value per year, warehousing, insurance, capital and obsolescence together. So $30k of slow movers costs $6,000 to $9,000 a year before you mark down a unit. I have watched sellers celebrate a great Q4 and spend Q1 liquidating what they ordered off a forecast they eyeballed in October.

The right app pays for itself on the first prevented stockout. The wrong one, or none, costs you every month in a way that does not show on the P&L until you go looking.

Start a free 14-day ReplenishRadar trial, connect your store, and see the days of supply on every product you carry, including the ones that need an order this week. Or get the free inventory health report if you want to look before you leap.

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Related Reading:

• Best Multi-Channel Inventory Software
• Stocky Shut Down: Best Alternatives for Shopify Sellers
• ReplenishRadar vs Inventory Planner
• ReplenishRadar vs Sumtracker
• ReplenishRadar vs Prediko
• ReplenishRadar vs Cin7
• ReplenishRadar vs Katana
• ReplenishRadar vs Zoho Inventory
• ReplenishRadar vs Veeqo
• ReplenishRadar vs SoStocked
• Shopify Inventory Forecasting Guide
• Safety Stock Calculation Guide
• How to Calculate Reorder Points
• E-commerce Inventory Management Guide