ChatGPT answers, unedited

For a brick-and-mortar + online business, the “best” platform depends mostly on your complexity: number of SKUs, locations, sales channels, wholesale needs, and whether you need an ERP or just inventory sync. The key is to choose a single inventory source of truth rather than trying to sync multiple systems equally.

Here are the main options I’d evaluate:

Salesforce### My typical recommendations by business stage

1. One store + Shopify store + moderate SKU count

• Shopify + Shopify POS is often enough.
• Keep Shopify as the inventory master.

2. Multiple stores, marketplaces, wholesale, or lots of SKUs

• Look at Cin7, especially if you sell through several channels and need purchasing, transfers, and fulfillment workflows. Cin7 supports integrations with ecommerce platforms, POS systems, marketplaces, accounting tools, and logistics systems. Cin7 Cin7

3. Complex operations (warehouses, manufacturing, financial reporting)

• Consider NetSuite or a similar ERP, possibly with a dedicated ecommerce layer.

What I’d check before choosing

Ask vendors to demo these exact workflows:

• A customer buys an item online → does store inventory update immediately?
• A customer buys in-store → does website availability update?
• Can you reserve stock for online orders?
• Can you transfer inventory between stores?
• Can you handle returns from one channel to another?
• Does it sync purchase orders and receiving?
• How does it handle bundles/kits/variants?
• What happens when two channels sell the last unit at the same time?

A common architecture for growing retailers is:

POS + Ecommerce → Inventory Management System → Accounting/ERP

rather than:

POS ↔ Ecommerce ↔ Marketplace ↔ Spreadsheets (which tends to create inventory mismatches).

If you share:

1. your ecommerce platform (Shopify, WooCommerce, Magento, etc.),
2. POS system,
3. number of stores,
4. approximate SKU count, and
5. whether you sell wholesale/Amazon/eBay,

I can narrow this down to 2–3 realistic choices.

POS ↔ Ecommerce ↔ Marketplace ↔ Spreadsheets (which tends to create inventory mismatches).

If you share:

1. your ecommerce platform (Shopify, WooCommerce, Magento, etc.),
2. POS system,
3. number of stores,
4. approximate SKU count, and
5. whether you sell wholesale/Amazon/eBay,

I can narrow this down to 2–3 realistic choices.

For a brick-and-mortar + online business, I’d narrow it to Shopify POS vs. Cin7. The better choice depends mostly on how complex your inventory operation is.

My practical recommendation

If you're already on Shopify or are happy to move your ecommerce onto Shopify, start by evaluating Shopify POS. It gives you a genuinely unified inventory model rather than having a separate ecommerce inventory and POS inventory that need reconciliation. Shopify

If inventory itself is the complicated part of your business, I'd look seriously at Cin7. For example, if you have Amazon/eBay/Walmart + your website + physical stores + multiple warehouses/3PLs, Cin7 is designed to act as the inventory/order hub underneath those channels. Cin7 Cin7

One important distinction: don't choose based purely on "does it sync inventory?" Almost all of these platforms claim that. Look at where the source of truth lives, how reservations/committed stock work, multi-location transfers, returns, bundles/kits, purchase orders, and what happens when two channels sell the last unit simultaneously.

If you tell me (1) what your online platform is, (2) what POS you're using, (3) roughly how many SKUs/stores you have, and (4) whether you sell on Amazon/eBay/Walmart/wholesale, I can narrow it down to 2–3 platforms and compare the actual architecture and likely implementation effort.

For a brick-and-mortar + online business, the right choice depends heavily on whether you need simple POS/e-commerce synchronization or a dedicated inventory hub.

The main options

• Shopify — Best fit if your online store is already on Shopify and you want the simplest setup. Shopify POS synchronizes inventory across physical locations, the online store, and other active sales channels in real time. Shopify Shopify Help Center
• Lightspeed — Worth considering if you're primarily a retail operation with multiple stores and need stronger retail/POS inventory capabilities. It tracks stock across stores, online, social and marketplaces. Lightspeed
• Cin7 — Better suited when inventory itself is the central problem: multiple sales channels, warehouses, marketplaces, wholesale, 3PLs, purchasing, etc. Cin7 says it supports 700+ integrations and real-time synchronization across POS, Shopify, Amazon, WooCommerce and other channels. Cin7 Cin7

How I'd narrow it down

The key question is what you're selling through. If you tell me your online platform (Shopify/WooCommerce/etc.), POS, number of stores, approximate SKU count, and marketplaces (Amazon/eBay/Walmart/etc.), I can compare the 2–3 systems that actually fit your setup, including likely cost and where the inventory sync can break down.

For a brick-and-mortar + ecommerce business, the “best” omnichannel inventory platform depends mainly on your complexity (number of stores, SKUs, warehouses, marketplaces, wholesale, manufacturing). There isn’t one universal winner, but these are the strongest fits:

My usual recommendations by scenario

• You have 1–3 stores + Shopify website:

→ Start with Shopify POS unless your inventory is unusually complex. Salesforce

• You have stores + Shopify + Amazon/eBay/wholesale + lots of SKUs:

→ Look seriously at Cin7. It is designed around keeping multiple sales channels and inventory locations synchronized. Cin7

• You are retail-first (fashion, gifts, specialty retail, many variants):

→ Lightspeed Retail is often a better operational fit than an ecommerce-first system. Fit Small Business

• You manufacture, kit products, or manage complex purchasing:

→ Consider Cin7, Katana, or an ERP approach. Cin7

Features I’d insist on before choosing

Make sure the platform supports:

• Real-time stock sync between store, website, and marketplaces
• Multi-location inventory (store, warehouse, back stock)
• Purchase orders and supplier management
• Barcode scanning and stock counts
• Returns/exchanges across channels
• “Available to promise” inventory (so you don’t oversell)
• Accounting integration (e.g., Xero/QuickBooks)
• Order routing (ship-from-store, pickup, warehouse fulfillment)

A few details would let me narrow this down:

1. What ecommerce platform are you using now (Shopify, WooCommerce, Magento, etc.)?
2. What POS runs your physical stores?
3. Roughly how many SKUs and locations?
4. Do you sell on marketplaces like Amazon/eBay or wholesale?

For a brick-and-mortar + ecommerce business, the “best” omnichannel inventory platform depends mostly on your catalog size, number of stores, sales channels (Amazon/marketplaces or just your site), and whether you need ERP-level controls. The strongest options usually fall into a few buckets: TechnologyAdvice Salesforce

My usual shortlist by scenario

• You have 1–5 stores + Shopify website: Shopify POS is usually the cleanest choice. Retail POS Plus
• You have lots of SKUs, variants, purchase orders, and store transfers: Lightspeed is often stronger. Fit Small Business
• You sell on Shopify + Amazon + wholesale + marketplaces: look at Cin7/Finale-style inventory management rather than relying only on POS. Retailpresso
• You’re scaling toward dozens of locations, complex purchasing, and finance integration: consider NetSuite or another ERP. Salesforce

Before choosing, I’d check that the platform handles:

• Real-time inventory across every location
• Barcode scanning and cycle counts
• Purchase orders and receiving
• Transfers between stores/warehouse
• Bundles/kits and product variants
• Returns across channels
• BOPIS and ship-from-store
• Marketplace integrations (if applicable)

If you tell me:

1. number of physical stores,
2. ecommerce platform (Shopify, WooCommerce, custom, etc.),
3. approximate SKU count, and
4. whether you sell on Amazon/wholesale,

I can narrow this to 2–3 best fits.

For a brick-and-mortar + online business, I’d shortlist cin7.com first if inventory complexity is the priority. It syncs inventory across retail, ecommerce, marketplaces, warehouses, and POS in real time, with 700+ integrations. Cin7 Cin7

• Cin7 — best for multi-channel/complex inventory and scaling.
• Shopify POS — best if your online store is already Shopify; online and in-store inventory are natively unified. Shopify Shopify
• Cin7 Omni — worth considering if you have multiple entities, 3PLs, EDI, or unusually complex workflows. Cin7

If you tell me your ecommerce platform, POS, number of locations, and marketplaces (Amazon/eBay/Walmart/etc.), I can narrow it to the best fit.

For a brick-and-mortar + online business, I’d shortlist Shopify and Square first. The best choice depends heavily on which side—ecommerce or physical retail—is the operational “source of truth.”

My pick

If online is a major/growing channel → Shopify + Shopify POS.

Shopify keeps inventory synchronized across retail locations, warehouses, the online store, and other sales channels. It also supports location-level inventory, transfers, order routing, and ship-from-store workflows. Shopify Help Center Shopify Shopify

If the physical stores are the center of the business → Square for Retail.

Square has particularly strong retail inventory/POS workflows, including real-time stock across locations and online, purchase orders, vendor management, transfers, barcode-based counts, and online-store integration. Square Square

Quick comparison

One important wrinkle: you don't necessarily have to replace your existing systems. For example, Square currently supports connecting an existing Shopify store and syncing catalog/inventory, including an option using Thrive Inventory with Square as the source of truth. Square Square

If you're more complex

If you have multiple stores + warehouse(s) + Shopify/Amazon/eBay/Walmart + substantial purchasing/fulfillment, I'd also look at a dedicated inventory/order-management system such as Cin7 rather than expecting the POS/ecommerce platform to handle everything. Cin7 specifically positions its system around real-time inventory synchronization across multiple channels. Cin7

My rule of thumb:

• 1–5 stores + Shopify → Shopify POS
• Retail-first + relatively straightforward ecommerce → Square for Retail
• Multiple ecommerce marketplaces + warehouses + complex purchasing → Shopify/Square + dedicated IMS such as Cin7

If you tell me how many physical locations you have, what your online platform is (Shopify/WooCommerce/etc.), and whether you sell on Amazon/eBay/Walmart, I can narrow it down to the best 2–3 setups for your business.

Shopify keeps inventory synchronized across retail locations, warehouses, the online store, and other sales channels. It also supports location-level inventory, transfers, order routing, and ship-from-store workflows. Shopify Help Center Shopify Shopify

If the physical stores are the center of the business → Square for Retail.

Square has particularly strong retail inventory/POS workflows, including real-time stock across locations and online, purchase orders, vendor management, transfers, barcode-based counts, and online-store integration. Square Square

Quick comparison

One important wrinkle: you don't necessarily have to replace your existing systems. For example, Square currently supports connecting an existing Shopify store and syncing catalog/inventory, including an option using Thrive Inventory with Square as the source of truth.

If you're more complex

For a brick-and-mortar + online business, the “best” omnichannel inventory platform depends mostly on your SKU count, number of stores, sales channels (Amazon/eBay/etc.), and whether you need ERP-level controls. The strongest options usually fall into a few buckets: Salesforce TechnologyAdvice

My typical recommendations by business stage

• You’re primarily ecommerce with a physical store: Shopify POS is usually the cleanest choice. It keeps online and in-store inventory under one system and avoids stitching together multiple platforms. Shopify
• You’re a traditional retailer with thousands of SKUs: Lightspeed is often a better operational fit because inventory depth, purchasing, and store transfers matter more than the storefront. TechnologyAdvice
• You sell on Amazon, wholesale, marketplaces, and your own site: look at Cin7 or another inventory management layer rather than relying only on a POS. Shopify
• You’re scaling toward multiple warehouses/entities: consider NetSuite earlier, before inventory complexity becomes painful. Shopify

Before choosing, I’d evaluate these five things:

1. Single source of truth: Can every channel pull from the same available-to-sell inventory?
2. Real-time stock updates: Does a store sale immediately reduce online availability?
3. Multi-location rules: Can you reserve, transfer, and fulfill from different stores?
4. Purchase orders/replenishment: Does it help prevent stockouts?
5. Marketplace integrations: Does it connect cleanly to Amazon, eBay, wholesale portals, etc.?

If you share:

• number of physical locations,
• approximate SKU count,
• ecommerce platform (Shopify/WooCommerce/custom),
• marketplaces (Amazon, Walmart, Etsy, etc.),
• POS you use today,

I can narrow it down to the 2–3 platforms that fit best.

For a brick-and-mortar + online business, I’d shortlist Shopify, Square, and Cin7—but the best choice depends heavily on how complex your inventory is.

My default pick: Shopify

If your online business is important and you want one system of record for store + website + inventory, Shopify is probably the strongest all-around choice.

• Shopify POS syncs inventory between physical locations, your online store, and other sales channels in real time. Shopify Shopify Help Center
• It supports separate inventory by store/warehouse, inventory transfers, and fulfillment routing. Shopify Help Center Shopify
• It can also integrate with an existing inventory-management/OMS system if you eventually outgrow Shopify's native inventory. Shopify
• Particularly good if you're selling through your website + physical store + social/marketplaces.

shopify.com

When I'd choose something else

Square is especially compelling if your physical stores are the center of the business. It maintains real-time stock across locations and online channels and includes purchasing, receiving, transfers, stock counts, and vendor management. Square Square

squareup.com

Cin7 becomes more interesting when inventory operations are complicated—multiple warehouses, wholesale/B2B, lots of channels, purchasing workflows, bundles/kits, etc. Its current positioning specifically targets centralized omnichannel inventory. Cin7

The key question

If you tell me (1) what your online store runs on (Shopify/WooCommerce/etc.), (2) what POS you use in-store, (3) roughly how many SKUs, and (4) whether you sell on Amazon/eBay/Walmart/etc., I can tell you which platform I'd pick and what the architecture should look like.

For a brick-and-mortar + online business, the “best” omnichannel inventory platform depends mostly on your complexity: number of stores, SKU count, marketplaces, warehouse setup, and whether your POS should be the inventory source of truth. The strongest options generally fall into a few buckets. TechnologyAdvice Salesforce

Best omnichannel inventory platforms by business type

My shortlist for most brick-and-mortar + online businesses

1. Shopify POS — if your online store is central and you want a unified customer experience.
2. Lightspeed Retail — if your store operations and inventory complexity are the hard part.
3. Cin7 — if you sell through lots of channels (Amazon, wholesale, marketplaces, multiple warehouses).
4. NetSuite/Dynamics — if you’re already operating like a larger retailer with dedicated ops teams.

What I’d evaluate before choosing

• Inventory source of truth: POS, ecommerce platform, or dedicated inventory system?
• Multi-location support: Can you transfer stock between stores and warehouses?
• Order routing: Can it handle ship-from-store, pickup, and split fulfillment?
• Purchasing: Does it generate POs and help with replenishment?
• Bundles/kits: Important if you sell sets, packs, or assembled products.
• Marketplace sync: Amazon, Etsy, Walmart, TikTok Shop, etc.
• Accounting integration: QuickBooks, Xero, NetSuite, etc.

A few questions would narrow this down a lot:

1. How many physical locations do you have (1, 5, 50+)?
2. Roughly how many SKUs/variants?
3. What ecommerce platform are you using now (Shopify, WooCommerce, Magento, something else)?
4. Do you sell on marketplaces like Amazon/Walmart/Etsy?
5. Are you looking for a new POS + inventory system, or just an inventory layer that syncs your existing tools?

For a brick-and-mortar + online business, I’d shortlist three approaches, depending on how complex your operation is:

My pick

If your online store is already Shopify: I'd start with Shopify POS. Shopify keeps orders and inventory synchronized between your retail locations and online store, including multi-location inventory. Shopify Shopify Help Center

shopify.com

If inventory is the bigger problem than the storefront: I'd strongly consider Cin7 Core. It acts more like a centralized inventory/order-management system and connects Shopify, Amazon, WooCommerce, accounting systems, POS, and other channels. Cin7 Cin7

cin7.com

If you're dealing with multiple warehouses, 3PLs, wholesale/EDI, or several business entities: Cin7 Omni is the more powerful choice. It is specifically designed around complex omnichannel operations and supports 700+ integrations. Cin7 Cin7

cin7.com

The key distinction

I'd think about it this way:

Shopify = your commerce platform that also handles inventory.

Cin7 = your inventory/operations platform that connects your commerce channels.

If you tell me (1) what POS you use, (2) what ecommerce platform, (3) number of physical locations, (4) whether you sell on Amazon/eBay/Walmart/etc., and (5) roughly how many SKUs, I can tell you which one I'd choose and what the ideal system architecture would look like.

For a brick-and-mortar + online business, I’d shortlist Shopify, Square, and Lightspeed—but the best choice depends heavily on where your online sales happen.

My default pick: Shopify

If your ecommerce operation is important and you want one inventory “source of truth,” Shopify + Shopify POS is probably the strongest all-around choice. Shopify syncs inventory, orders, products, and customer data between physical locations and online channels, with real-time inventory updates. Shopify Shopify

It becomes particularly attractive if you sell through your website + social channels + marketplaces. Shopify supports inventory synchronization across channels such as Amazon, eBay, Walmart, TikTok, Instagram, and others. Shopify

shopify.com

When I'd choose the others

• Square — Best if the physical store is the center of the business and you want a relatively straightforward POS/inventory system with ecommerce attached. Square maintains real-time inventory across locations and online, including transfers and purchase orders. Square Square
• Lightspeed — Worth considering if you're a more sophisticated retailer with complex catalogs, purchasing, multiple locations, or specialized retail workflows. Its retail POS can automatically sync inventory/products to its ecommerce platform. Lightspeed Retail
• Cin7 — I'd look at this when you have lots of channels, warehouses, wholesale/B2B, or operational complexity and need a dedicated inventory/order-management layer rather than simply a POS with inventory. Cin7 specifically positions its system around real-time stock synchronization across channels. Cin7

Quick decision rule

The biggest thing I'd evaluate isn't just “does inventory sync?” Almost every serious platform says yes. Test how it handles returns, bundles/kits, variants, purchase orders, transfers between stores/warehouse, safety stock, marketplace orders, partial fulfillment, and overselling. Those are where omnichannel setups tend to break.

If you tell me (1) what ecommerce platform you use now, (2) what POS you use, (3) number of stores/warehouses, and (4) whether you sell on Amazon/eBay/Walmart/etc., I can narrow this to the best 2–3 options for your specific setup.

Yes. For a brick-and-mortar + online business, I’d narrow the field to Shopify POS and Cin7 Omni, with the right choice depending on how complex your inventory operation is.

My shortlist

• shopify.com — best if Shopify is already your online store.

It gives you one inventory/order system across your physical locations and online channels, with automatic inventory syncing, in-store pickup, ship-to-customer, and cross-channel returns. Shopify Shopify Help Center
Best for: 1–several stores, straightforward inventory, DTC/e-commerce focus, ease of use.

• cin7.com — best if inventory is becoming operationally complex.

It is designed as a central inventory/order hub across retail, e-commerce, wholesale, marketplaces, warehouses and 3PLs. It supports 700+ integrations and real-time inventory syncing across channels. Cin7 Cin7
Best for: multiple warehouses/stores, Amazon/eBay/Walmart + DTC, wholesale, 3PLs, purchasing, bundles/kits, EDI, or more sophisticated inventory controls.

The key distinction

Think of it this way:

Shopify POS:
Online store ↔ Shopify inventory ↔ Physical stores

Cin7:
Shopify + Amazon + marketplaces + POS + warehouses + 3PL + wholesale ↔ Cin7 inventory hub

So if you're primarily DTC + physical retail, I'd lean Shopify POS. If you're already juggling multiple sales channels, warehouses, wholesale, or fulfillment partners, I'd lean Cin7 Omni.

If you tell me (1) what your online platform is, (2) what POS you use, (3) number of stores/warehouses, and (4) whether you sell on Amazon/Walmart/eBay/wholesale, I can recommend the best architecture and 2–3 platforms to compare.

For a brick-and-mortar + online business, I’d shortlist three, depending on how complex your operation is:

My pick

If your online store is Shopify: go with Shopify POS unless you have unusually complicated inventory. Shopify says inventory can be tracked by location and synchronized in real time across POS, the online store, and sales channels. Shopify

If you sell on several marketplaces, have multiple warehouses/stores, do wholesale, or expect significant growth: I'd lean toward Cin7. It acts as a centralized inventory/order hub and supports 700+ integrations, including Shopify, Amazon, WooCommerce, accounting systems and 3PLs. Cin7 Cin7

If you want simple and inexpensive: Square for Retail is compelling. It keeps inventory synchronized between physical locations and online channels and includes purchase orders, transfers and inventory counting. Square Square

The big thing I'd avoid is having the website and POS maintain separate inventory databases. You want one system of record where a sale in the store immediately reduces what's available online—and vice versa.

If you tell me (1) what your online platform is, (2) how many physical locations, (3) whether you sell on Amazon/eBay/Walmart/etc., and (4) roughly how many SKUs, I can tell you which of these I'd choose and why.

For a brick-and-mortar + online business, the “best” omnichannel inventory platform depends mostly on your number of stores, SKU count, sales channels (Amazon/marketplaces/wholesale), and whether your POS is already chosen. The goal is usually one inventory source of truth so a store sale, online order, return, transfer, or restock updates every channel. Cin7

Here are the strongest fits:

My usual recommendations by business stage

• 1–3 stores + Shopify website:

→ Shopify POS is often the cleanest setup. You avoid stitching together separate ecommerce and retail systems. Salesforce

• Multiple stores + wholesale + marketplaces (Amazon/eBay/etc.):

→ Look closely at Cin7. It is designed more as an inventory/order management layer rather than just a POS inventory tracker. Cin7

• 10+ locations, complex purchasing, accounting, forecasting, or international operations:

→ NetSuite or a similar ERP becomes more appropriate. Salesforce

• Retail-first with a strong in-store operation:

→ Lightspeed is often a better fit than ecommerce-first platforms. TechnologyAdvice

A few questions would narrow this down quickly:

1. How many physical locations do you have (or plan to have)?
2. What ecommerce platform are you using now (Shopify, WooCommerce, Magento, custom, etc.)?
3. Do you sell on marketplaces like Amazon/Walmart/Etsy?
4. Roughly how many SKUs and inventory locations (back room + warehouses)?
5. Do you need wholesale/B2B inventory too?

For a brick-and-mortar + online business, I’d shortlist these:

My recommendation

If you have one or a few stores and Shopify is already your ecommerce platform → Shopify + Shopify POS. It's the simplest "single source of truth" setup and minimizes integration headaches. Shopify specifically supports inventory across physical locations, online channels, and warehouses. Shopify

If you're selling across Shopify + Amazon/eBay/Walmart + wholesale + multiple warehouses/3PLs → Cin7. That's where a dedicated inventory/OMS layer becomes more compelling. Cin7 is designed to make inventory the central hub rather than having your ecommerce platform be the hub. Cin7 Cin7

The key architectural question is how many channels/locations you have and what you use for POS today. If you tell me something like "2 stores, Shopify, Amazon, 3,000 SKUs, 1 warehouse, Square POS", I can recommend the best stack and tell you whether you actually need Cin7 or would be better off keeping it simpler.

For a brick-and-mortar + online business, I’d shortlist Shopify POS and Cin7, with the right choice depending on how complex your inventory operation is.

My quick take

• Best for most growing retailers: Shopify + Shopify POS. It gives you one product/inventory system across your physical store, online store, and multiple locations, with inventory updating in real time as items are sold, returned, transferred, etc. Shopify Shopify
• Best for complex/multichannel inventory: cin7.com. I'd favor this if you sell through Shopify + Amazon/eBay/Walmart + physical retail + wholesale, have warehouses/3PLs, or need more sophisticated purchasing, forecasting, bundles, or inventory workflows. Cin7 says it supports 700+ integrations and real-time inventory/order syncing across channels. Cin7 Cin7
• Best if you're heavily invested in Shopify: stay within Shopify unless you have a specific inventory complexity that Shopify can't handle. Shopify POS already synchronizes inventory across locations and online channels. Shopify

What I'd choose by business profile

The key distinction is that Shopify is excellent as the commerce platform that also handles inventory, whereas Cin7 is more of a centralized inventory/order-management layer connecting your different commerce channels. Cin7 specifically positions itself around syncing retail, ecommerce, wholesale, marketplaces, warehouses and 3PLs. Cin7 Cin7

If you tell me (1) what your online platform is, (2) what POS you use in the store, (3) whether you sell on Amazon/eBay/Walmart, (4) approximate SKU count, and (5) number of physical locations, I can narrow it down to the best 2–3 options for your exact setup.

For a brick-and-mortar + online business, I’d shortlist these:

• shopify.com — best if your online store is the center of the business. Shopify POS syncs inventory, orders, and customers between physical locations and the online store, and supports multiple locations and other sales channels. Shopify Help Center Shopify
• cin7.com — best if inventory is the complicated part. It acts more like a central inventory/OMS layer, syncing retail, Shopify, Amazon, WooCommerce, warehouses, 3PLs, wholesale, etc. It advertises 700+ integrations and real-time inventory/order synchronization. Cin7 Cin7
• Lightspeed — worth considering if your physical retail operation is more sophisticated than your e-commerce side, particularly if POS, retail workflows, and multiple stores are the priority.

My recommendation

If you have one/few stores + Shopify online: go Shopify POS + Shopify inventory. It's the simplest architecture because you aren't introducing another system just to synchronize inventory. Shopify explicitly supports real-time inventory across retail locations and online/other active sales channels. Shopify Help Center Shopify

If you're selling across Shopify + Amazon/Walmart/eBay + stores + warehouse/3PL: I'd lean Cin7 as the inventory system of record, with your channels feeding into it. That's where a dedicated inventory/OMS starts earning its keep. Cin7 Cin7

The key question is how many channels and locations you have. If you tell me something like “2 stores, Shopify, Amazon, ~3,000 SKUs, and a 3PL”, I can recommend the best architecture and compare Shopify vs Cin7 vs Lightspeed for your specific setup.

For a brick-and-mortar + online business, I’d shortlist these three, with the best choice depending on how complex your operation is:

My recommendation

If you're already on Shopify: stick with Shopify POS unless your inventory/order workflows are getting complicated. Shopify synchronizes inventory across physical locations, the online store, and sales channels in real time. Shopify Shopify

If you're selling through several channels—for example, physical store + Shopify + Amazon/eBay/Walmart + wholesale—and inventory accuracy is becoming a major operational issue, I'd lean toward Cin7. It acts as a central inventory/order hub and supports 700+ integrations, including Shopify, Amazon, WooCommerce, Walmart, eBay, accounting systems, and 3PLs. Cin7 Cin7

Cin7 is particularly compelling if you need multi-location inventory, purchase orders, warehouse/3PL management, channel-specific inventory, forecasting, and centralized order management, rather than simply syncing the quantity on hand. Cin7 Cin7

The key distinction

I'd think of it this way:

Shopify POS → "Make my online and physical store work as one."

Cin7 → "Make my entire inventory/supply-chain operation the single source of truth."

If you tell me (1) what your online platform is, (2) what POS you use, (3) which marketplaces you sell on, (4) number of locations, and roughly (5) number of SKUs/orders per month, I can narrow this to the best 1–2 options for your business and explain the architecture I'd use.

For a brick-and-mortar + online business, I’d narrow it to Shopify vs. Cin7, depending on how complex your inventory operation is.

My recommendation

• Best overall for a straightforward retail + ecommerce operation: shopify.com

• In-store and online inventory stays synced in real time.
• Handles multiple physical locations.
• Strong choice if your ecommerce store is already—or will be—Shopify.
• Supports things like buy-online/pickup-in-store, ship-from-store, returns, and exchanges across channels. Shopify Shopify
• Best if inventory is becoming operationally complex: cin7.com

• Better as a central inventory/operations hub when you're selling through Shopify + Amazon + marketplaces + physical stores + wholesale, or using multiple warehouses/3PLs.
• Cin7 says it supports 700+ integrations and real-time inventory synchronization across ecommerce, POS, warehouses, and marketplaces. Cin7 Cin7
• Its Omni product is particularly geared toward more complex, customizable multichannel operations, while Core is the more turnkey SMB option. Cin7

The rule of thumb

If you tell me what you're currently using for your website, POS, marketplaces (Amazon/eBay/Walmart/etc.), number of stores, and approximate SKU count, I can recommend the specific stack I'd use and how I'd structure the inventory sync.

For a brick-and-mortar + ecommerce business, I’d put Shopify + Shopify POS at the top of the list if you want one system to be the inventory “source of truth.”

My shortlist

Why Shopify: its POS and ecommerce platform share inventory, orders, products and customer data, and Shopify says inventory updates across locations and sales channels in real time. It also supports workflows like buy-online-pickup-in-store, ship-from-store, and cross-channel returns. Shopify Shopify

If you're selling on Amazon/eBay/Walmart/social channels in addition to your own website and store, Shopify can also synchronize inventory across those channels. Shopify

I'd choose Lightspeed instead if your business is primarily physical retail and you need deeper retail-specific inventory/POS functionality than ecommerce functionality.

I'd choose Cin7 if you're getting into serious complexity—multiple warehouses, wholesale/B2B, lots of marketplaces, purchasing/replenishment, or an ERP/WMS-style setup.

The key question

The best platform depends heavily on what your current stack looks like. If you tell me:

• Your ecommerce platform (Shopify, WooCommerce, etc.)
• POS you're using now
• Marketplaces (Amazon, eBay, Walmart, Etsy, etc.)
• Number of physical locations
• Approx. number of SKUs
• Whether you do wholesale/B2B

…I can narrow it down to 2–3 platforms and tell you exactly which I'd pick for your business, including likely integration pain points.

Why Shopify: its POS and ecommerce platform share inventory, orders, products and customer data, and Shopify says inventory updates across locations and sales channels in real time. It also supports workflows like buy-online-pickup-in-store, ship-from-store, and cross-channel returns. shopify.com shopify.com

If you're selling on Amazon/eBay/Walmart/social channels in addition to your own website and store, Shopify can also synchronize inventory across those channels.

I'd choose Lightspeed instead if your business is primarily physical retail and you need deeper retail-specific inventory/POS functionality than ecommerce functionality.

I'd choose Cin7 if you're getting into serious complexity—multiple warehouses, wholesale/B2B, lots of marketplaces, purchasing/replenishment, or an ERP/WMS-style setup.

The key question

For a brick-and-mortar + online business, Shopify is probably the best default choice if your goal is one inventory system that keeps physical and digital sales synchronized.

My shortlist

• Shopify — Best overall for omnichannel

• Shopify POS and the online store share inventory, orders, products, and customer data.
• Supports inventory across multiple stores, warehouses, pop-ups, and online channels with real-time syncing. Shopify Shopify Help Center
• Particularly strong if you're selling through your website plus social and marketplace channels.
• Best fit if ecommerce is an important growth channel.
• Square — Best if your physical store is the center of the business

• Excellent retail POS and inventory tools, with stock syncing across locations and online channels. Square Square
• Can connect an existing Shopify, Wix, or WooCommerce site rather than forcing you to rebuild your website. Square Square
• I'd choose this if you care more about in-store operations/POS than sophisticated ecommerce.
• Cin7 — Best when inventory gets complicated

• Worth considering if you have multiple warehouses, wholesale/B2B, lots of SKUs, bundles/kits, or many marketplaces.
• It's more of an inventory/order-management layer than simply a POS + ecommerce platform. Cin7's 2026 guide specifically positions omnichannel IMS software around real-time synchronization across sales channels. Cin7

What I'd pick

The key is to establish one inventory source of truth rather than having Shopify, POS, Amazon, etc. independently maintaining quantities. Shopify can natively handle this when the sales channels are within its ecosystem; Square similarly keeps inventory synchronized across locations and online. Shopify Square

If you tell me (1) what your online platform is now, (2) what POS you use in-store, (3) approximate SKU count, and (4) whether you sell on Amazon/eBay/Walmart/social, I can narrow it down to the best 2–3 setups for your business.

For a brick-and-mortar + online business, the “best” inventory platform depends mostly on your complexity (SKUs, locations, marketplaces, wholesale, manufacturing), but these are the strongest fits:

My typical recommendations by business stage

• 1 store + Shopify website + a few hundred SKUs:

→ Shopify POS is usually the cleanest setup.

• Multiple stores, Amazon, wholesale, lots of SKUs, purchasing headaches:

→ Cin7 is often the better “inventory brain” sitting behind your sales channels. Cin7

• Retail is the core business (staff selling in-store all day):

→ Lightspeed is worth evaluating. TechnologyAdvice

• Growing toward ERP territory (multiple warehouses, complex accounting, manufacturing):

→ NetSuite or a similar ERP becomes more appropriate. Salesforce

Features I’d prioritize before choosing

Make sure the system can handle:

• Real-time inventory sync across store + website + marketplaces
• Multi-location stock transfers
• Purchase orders and supplier management
• Barcode scanning
• Returns/exchanges across channels
• Bundles/kits/variants
• “Available to promise” inventory (what you can actually sell)
• Accounting integration
• Reporting by channel and location

A couple of questions would narrow this down a lot:

1. What ecommerce platform are you on (Shopify, WooCommerce, Magento, something else)?
2. What POS do your stores use?
3. Roughly how many SKUs and physical locations?
4. Do you sell on marketplaces like Amazon/Walmart, or mostly your own site?

For a brick-and-mortar + online business, I’d shortlist these:

My recommendation

If you're primarily retail + Shopify: go with Shopify POS. It's simpler and avoids introducing another inventory master system. Shopify specifically supports multi-location inventory and real-time synchronization between POS, online, warehouses, and sales channels. Shopify

If you sell across Shopify + Amazon/eBay/Walmart + physical stores + wholesale, I'd lean toward Cin7 Core. It gives you a centralized inventory/order layer rather than making your ecommerce platform responsible for everything. Cin7 says it synchronizes inventory across ecommerce, marketplaces, POS, and warehouses in real time. Cin7 Cin7

If you're already operationally complex—multiple warehouses, 3PLs, EDI, multiple legal entities, sophisticated fulfillment—look at Cin7 Omni rather than Core. Cin7

The key question is what channels you're actually syncing. If you tell me your stack (e.g. Shopify + physical store + Amazon + eBay + QuickBooks, number of locations, and approximate SKU count), I can narrow this to the best 2–3 options and explain the architecture I'd use.

For a brick-and-mortar + online business, Shopify is probably the best default choice if you want one system to be the inventory “source of truth.”

My shortlist

Shopify's current setup can sync inventory across stores, warehouses, your online store, social channels, and marketplaces, with stock adjusting as products are sold, returned, transferred, or received. Shopify Shopify

It also supports genuinely omnichannel workflows such as buy online/pick up in store, buy in store/ship to customer, online returns in store, and ship-from-store. Shopify Shopify

shopify.com

When I'd choose something else

• Choose Lightspeed if your physical retail operation is the center of the business and you need particularly strong retail/POS functionality.
• Choose Cin7 if you have multiple warehouses, lots of SKUs, wholesale/B2B, Amazon/eBay/Walmart, kitting/bundles, or complicated purchasing and fulfillment. In that scenario, a dedicated inventory/OMS layer can be more appropriate than making the ecommerce platform the inventory brain.
• Choose Square if you're relatively small and primarily need straightforward store + website inventory without a lot of operational complexity.

The key question

The best platform actually depends heavily on what your other channels are.

If you tell me:

1. What ecommerce platform you use now (Shopify, WooCommerce, BigCommerce, etc.)
2. Your POS
3. Marketplaces (Amazon, eBay, Walmart, Etsy, etc.)
4. Rough number of SKUs
5. Number of physical locations/warehouses
6. Whether you do wholesale/B2B

…I can narrow it down to 2–3 specific setups and tell you which one I'd pick for your business, including where the inventory master should live.

For a brick-and-mortar + ecommerce business, I’d shortlist Shopify and Cin7, with the better choice depending on how complex your inventory operation is.

My recommendation

If your online store is already on Shopify, I'd start with Shopify POS. It gives you one inventory system across your physical locations, online store, warehouses, and other selling channels, with inventory updating as sales, returns, transfers, and exchanges happen. Shopify Shopify

That is probably the best value/simple setup if you have:

• 1–several physical stores
• Shopify ecommerce
• A relatively straightforward catalog
• Standard retail inventory
• No complicated B2B/wholesale requirements

I'd choose Cin7 if inventory itself is becoming the operational bottleneck. Cin7 is designed to sit above multiple channels and systems, syncing ecommerce, POS, marketplaces, warehouses, 3PLs, purchasing, and accounting. It supports 700+ integrations and real-time inventory synchronization. Cin7 Cin7

Cin7 becomes particularly attractive if you have:

• Shopify plus Amazon/eBay/WooCommerce/etc.
• Multiple warehouses or 3PLs
• Wholesale/B2B alongside retail
• Lots of SKUs/variants
• Purchase orders and supplier management
• Inventory transfers between locations
• More sophisticated forecasting/reordering
• A need to keep an existing POS rather than replace it

Cin7's Omni product is specifically aimed at more complex omnichannel environments, while Cin7 Core is the more turnkey SMB option. Cin7 Cin7

The key decision

I wouldn't choose based simply on which platform has the most inventory features. I'd map your actual flow:

Store POS → central inventory → ecommerce → marketplaces → warehouse/3PL → accounting

If you tell me what you're using today for POS, ecommerce, accounting, number of stores, approximate SKU count, and which marketplaces you sell on, I can recommend the specific stack—and tell you whether you actually need Cin7 or whether Shopify can handle it without adding another system.

For a brick-and-mortar + online business, I’d shortlist Shopify, Lightspeed, and Cin7. The best choice depends mostly on whether your online store or your physical retail operation is the “center of gravity.”

My recommendation

If you don't have unusually complex inventory requirements, I'd go with Shopify. Its POS and ecommerce platform share the same back office, and Shopify says sales, returns, transfers, and inventory updates flow across locations and online channels in real time. Shopify Shopify

shopify.com

I'd lean toward Lightspeed instead if your physical stores are operationally more complicated—for example, multiple locations, substantial purchasing/reordering, lots of SKUs/variants, or frequent stock transfers. Lightspeed specifically supports cross-location inventory, reorder points, purchase orders, and synchronized online/physical stock. Lightspeed Lightspeed

lightspeedhq.com

Cin7 becomes interesting if you sell through several ecommerce marketplaces, wholesale/B2B, your own site, and retail stores and need a dedicated inventory/OMS layer rather than relying primarily on your POS. Its 2026 guidance specifically positions omnichannel inventory management around maintaining one synchronized stock position across channels. Cin7

cin7.com

One important distinction: don't choose based simply on whether a platform says "omnichannel." I'd evaluate how it handles inventory reservations, multi-location allocation, purchase orders, returns, bundles/kits, marketplace orders, and overselling—those are where implementations tend to get painful.

If you tell me (1) what your online platform is now, (2) what POS you use, (3) number of stores, and (4) roughly how many SKUs/orders you have, I can narrow this to the best 1–2 options for your setup.

For a brick-and-mortar + online business, I’d shortlist Shopify, Square, and Cin7—but the best choice depends heavily on how many channels and locations you have.

My default pick: Shopify

If ecommerce is an important part of the business, Shopify + Shopify POS is probably the strongest all-around choice. It gives you one inventory system across your physical store, online store, warehouses, and additional sales channels, with inventory updating as sales, returns, transfers, and exchanges occur. Shopify Shopify

shopify.com

How I'd compare them

Square is particularly attractive if you already run your store on Square. It synchronizes inventory across locations and online channels, supports purchase orders and vendors, and can connect to an existing ecommerce site. Square Square

squareup.com

Cin7 becomes more interesting when you're selling through several ecommerce marketplaces, have multiple warehouses, lots of SKUs, wholesale/B2B, bundles/kits, or complicated purchasing and fulfillment. Its 2026 comparison guide specifically focuses on real-time inventory synchronization across multiple channels. Cin7

The key question

If you tell me (1) what your online platform is now (Shopify/WooCommerce/etc.), (2) what POS you use in-store, (3) roughly how many SKUs, (4) number of physical locations, and (5) whether you sell on Amazon/eBay/etc., I can recommend the best architecture—and tell you whether you actually need a dedicated inventory system like Cin7 or whether Shopify/Square alone will handle it.

For a brick-and-mortar + ecommerce business, I’d shortlist these:

My default recommendation: Shopify

If your ecommerce operation is important—or you expect to add marketplaces/social selling—I'd lean Shopify + Shopify POS. It gives you one product catalog and inventory system, with stock automatically updating as products are sold, returned, transferred, or restocked across physical locations and online channels. www.shopify.com

Shopify also supports syncing inventory across channels such as Amazon, Walmart, eBay, TikTok, Instagram and Facebook, which becomes particularly useful as you add sales channels. www.shopify.com

When I'd choose Square instead

If the physical store is the center of the business and you want a particularly straightforward POS, Square for Retail is compelling. It maintains real-time stock across locations and online channels and includes purchasing/vendor and stock-transfer functionality. squareup.com

It can also connect to an existing Shopify website, so you don't necessarily have to migrate your ecommerce store. squareup.com

When I'd choose Lightspeed

I'd investigate Lightspeed if you have a large/complex catalog, multiple locations, or more sophisticated retail inventory requirements. It supports a unified catalog and SKU/stock tracking across physical locations and online sales channels. www.lightspeedhq.com

If you tell me what you're currently using for (1) your website, (2) POS, (3) Amazon/eBay/etc., and roughly (4) number of SKUs and stores, I can tell you which setup I'd pick and whether you need a dedicated inventory-management system like Cin7 or Katana at all.

For a brick-and-mortar + online business, I’d shortlist these:

🥇 My default pick: Shopify

Shopify POS is particularly strong if your website/ecommerce business is important. Shopify maintains inventory by location and synchronizes it across POS, online store, and sales channels in real time. Sales, returns, exchanges, and transfers update inventory as well. www.shopify.com

That gives you a setup like:

One product catalog → one inventory pool → store + website + social/marketplaces

You can also keep inventory separated by physical location/warehouse when needed.

🥈 Square if you're more retail-first

Square for Retail is a very good alternative if your brick-and-mortar operation is the center of the business. Square supports real-time inventory across locations and online channels, purchase orders, vendor management, barcode-based counting, and online ordering. squareup.com

It's especially attractive if you want POS + payments + inventory + ecommerce in one relatively simple system.

One caveat: if you already have a sophisticated Shopify site, Square can connect to Shopify, but you'll want to be deliberate about which system is the inventory source of truth. Square itself now documents integrations that synchronize Square inventory/catalog with Shopify. squareup.com

What I'd choose based on your situation

• Shopify website + physical store: Shopify POS
• Mostly physical retail + basic online store: Square for Retail
• Shopify + Amazon/eBay/Walmart/Etsy + multiple warehouses: Shopify plus a dedicated multichannel inventory/ERP layer
• Multiple physical stores: Shopify or Square; Shopify gets particularly compelling as the operation becomes more sophisticated.

The key isn't just "does inventory sync?"—it's whether you have one authoritative inventory ledger, real-time adjustments, location-level stock, reservations/committed stock, returns, transfers, and reliable marketplace synchronization.

If you tell me (1) what ecommerce platform you use now, (2) your POS, (3) which marketplaces you sell on, and (4) roughly how many SKUs/orders per month, I can narrow it down to 2–3 platforms and tell you which I'd pick.

If you’re doing brick-and-mortar + ecommerce and want inventory to stay synchronized automatically, I’d shortlist these:

My default recommendation: Shopify

If your online business is significant, Shopify + Shopify POS is probably the cleanest architecture. Shopify maintains inventory across stores, warehouses, POS, online sales, and other channels, with stock updating as products are sold, returned, transferred, etc. www.shopify.com

It also supports channels such as Amazon, Walmart, eBay, Instagram, Facebook, TikTok and others, which makes it easier to grow beyond your own website. www.shopify.com

Choose Square instead if your physical store is the center of the business and you want a simpler POS/retail system. Square can synchronize inventory, orders and customer data between the physical store and online channels. squareup.com

Choose Cin7 if you're dealing with a lot of SKUs, warehouses, wholesale orders, Amazon/eBay/Walmart/etc., bundles/kits, or complicated purchasing and fulfillment. That's where a dedicated inventory/OMS layer starts making more sense than relying solely on a POS.

The key question

The best platform depends heavily on what your channels are. For example:

Physical store + Shopify website + Amazon + eBay + wholesale is a different problem from physical store + Shopify website.

If you tell me (1) your current ecommerce platform, (2) POS, (3) marketplaces you sell on, (4) approximate SKU count, and (5) number of stores/warehouses, I can narrow this to the best 2–3 options and explain exactly how I'd structure the inventory sync.

For a brick-and-mortar + online business, the “best” platform depends mostly on your SKU count, number of stores, marketplaces, and how complex your inventory is. The strongest options today are: technologyadvice.comwww.salesforce.com

A practical rule of thumb:

• Under ~5,000 SKUs, 1–3 stores, ecommerce-led: Shopify + POS is usually the cleanest choice. technologyadvice.com
• Multiple stores, lots of vendors, complex variants (apparel, hardware, specialty retail): Lightspeed is often stronger. technologyadvice.comfitsmallbusiness.com
• Selling on Shopify + Amazon + wholesale + multiple warehouses: look at Cin7 or similar inventory-first systems. technologyadvice.comwww.salesforce.com
• High-volume operation with accounting/supply chain complexity: consider NetSuite or an ERP approach. technologyadvice.comwww.salesforce.com

Before choosing, I’d compare these capabilities:

1. Real-time inventory across every channel (store, website, marketplaces)
2. Purchase orders and supplier management
3. Inventory transfers between locations
4. Barcode scanning and cycle counts
5. Bundles/kits and product variants
6. Returns and exchanges across channels
7. Accounting integration
8. API/integration options

If you tell me:

• your ecommerce platform (Shopify, WooCommerce, Amazon, etc.)
• number of stores
• approximate SKU count
• monthly order volume
• whether you do wholesale

…I can narrow it to 2–3 platforms that fit your operation.

For a brick-and-mortar + online business, I’d shortlist three approaches, depending on how complex your operation is:

My pick

If your online store is already Shopify: start with Shopify + Shopify POS. Shopify can track inventory at each physical location and sync it in real time across POS, the online store, and sales channels. www.shopify.com

If you sell on several marketplaces, have multiple warehouses, do wholesale/B2B, or expect significant operational complexity: I'd lean toward Cin7. It acts as a centralized inventory/order layer and connects Shopify, Amazon, WooCommerce, BigCommerce, eBay, Walmart, 3PLs, accounting systems, and POS. It advertises 700+ integrations and real-time inventory synchronization. www.cin7.com

In particular, Cin7 Omni is designed for more complex omnichannel setups, including multiple locations/entities, EDI, 3PLs, and customized workflows. www.shopify.comwww.cin7.comwww.cin7.com

The architecture I'd aim for

Physical store POS + ecommerce + marketplaces → one inventory "source of truth" → accounting/3PL

The important thing isn't merely syncing product quantities. You want the system to correctly handle:

• In-store sale → online quantity decreases
• Online sale → store quantity decreases
• Return/exchange → inventory adjusts everywhere
• Transfers between stores/warehouse
• Ship-from-store
• Buy online/pick up in store
• Purchase orders and receiving
• Reserved/committed inventory
• Marketplace orders
• Bundles/kits
• Multi-location stock

If you tell me (1) what ecommerce platform you use, (2) your POS, (3) marketplaces like Amazon/eBay/Walmart, (4) number of physical locations, and (5) roughly how many SKUs/orders you have, I can tell you which of Shopify, Cin7, Lightspeed, or another option is the best fit and what the ideal stack would look like.

For a brick-and-mortar + online business, I’d narrow it to three tiers:

• Shopify POS — best if your online store is already on Shopify or ecommerce is the center of the business. It keeps online and in-store inventory in the same system and supports location-level inventory and omnichannel fulfillment. www.shopify.com
• Lightspeed Retail — best if inventory complexity is the bigger problem: lots of SKUs/variants, vendors, purchase orders, multiple stores, transfers, or more sophisticated retail reporting. Recent comparisons rate it particularly highly for complex retail inventory. fitsmallbusiness.com
• Cin7 — best if you're becoming a serious multichannel operation—e.g., physical stores + Shopify + Amazon/Walmart + wholesale/B2B + warehouses. It acts more like a dedicated inventory hub and has 700+ integrations. www.cin7.com

My default recommendation:
If you have one or a few stores and a Shopify-type ecommerce operation, go Shopify POS. If inventory purchasing, transfers, vendors, and multi-location operations are already getting complicated, Lightspeed is probably the better fit. If you sell through many external marketplaces/wholesale channels, I'd look hardest at Cin7.

The key is to make sure you have one inventory source of truth, rather than having the website and POS independently maintain stock. That's what prevents the classic “sold the last unit in-store but the website still showed it available” problem. www.cin7.com

If you tell me (1) what your online platform is, (2) number of physical locations, (3) approximate SKU count, and (4) other channels like Amazon/wholesale, I can tell you which of these is the best fit and what the architecture should look like.

For a brick-and-mortar + online business, I’d shortlist these:

My default recommendation: Shopify

If your online channel is important, Shopify + Shopify POS is probably the cleanest setup. Shopify maintains inventory across locations and syncs it between POS, online store, and other sales channels in real time. It also supports transfers, receiving, barcode workflows, BOPIS, ship-from-store, and multi-location inventory. www.shopify.com

Shopify POS features

When I'd pick Square instead

If your physical store is the center of the business and ecommerce is secondary, Square is very compelling. Square's retail system handles inventory, purchase orders, transfers, low-stock alerts, and syncing between in-store and online channels. squareup.com

It can also connect to an existing Shopify site, although that introduces an integration/middleware layer rather than having everything natively in one platform. squareup.com

When I'd look at Lightspeed

If you have lots of SKUs, multiple stores, complicated purchasing, or more sophisticated retail workflows, Lightspeed deserves a serious look. Its Retail POS can act as the inventory source of truth while syncing stock with its ecommerce platform. retail-support.lightspeedhq.com

Rule of thumb:

• Online + store equally important → Shopify
• Store-first + simple online → Square
• Complex/multi-location retail → Lightspeed
• Many marketplaces/wholesale/ERP requirements → consider a dedicated inventory/OMS such as Cin7 alongside your POS/ecommerce platform

If you tell me (1) what your online platform is now, (2) what POS you use, (3) number of stores, and (4) roughly how many SKUs, I can narrow it down to the best 2–3 architectures for your business.

For a brick-and-mortar + online business, I’d shortlist these three:

My pick

If your online store is already on Shopify: go with Shopify + Shopify POS unless you have unusually complex inventory. Shopify can synchronize inventory across physical locations, your online store, and sales channels in real time, while also supporting things like ship-from-store and buy-online/pickup-in-store. www.shopify.com

If you're selling through several marketplaces/wholesale channels or have multiple warehouses: I'd lean toward Cin7 Omni. It's designed to be the inventory/order hub across retail, ecommerce, marketplaces, warehouses and 3PLs, with 700+ integrations and real-time inventory synchronization. www.cin7.com

A useful rule of thumb:

• 1–2 stores + Shopify website → Shopify POS
• Multiple stores + Shopify/Amazon/Walmart/eBay/wholesale/3PL → Cin7 Omni
• Primarily physical retail with sophisticated POS needs → Lightspeed
• Manufacturing, bundles/BOMs, complex purchasing → Cin7 becomes particularly attractive

The biggest thing I'd evaluate isn't just "does it sync inventory?"—it's which system becomes the single source of truth and how it handles reservations, returns, transfers, purchase orders, bundles/kits, and overselling.

If you tell me (1) your ecommerce platform, (2) POS, (3) number of stores, (4) marketplaces you sell on, and (5) approximate SKU count, I can narrow this down to the best 2–3 options for your setup and compare likely costs/integration complexity.

For a brick-and-mortar + online business, I’d shortlist three approaches, depending on how complex your inventory operation is:

Best overall for a straightforward setup: Shopify

If your online store is already (or could be) on Shopify, Shopify + Shopify POS is probably the cleanest option. It maintains inventory across physical locations, the online store, and sales channels in real time, while also handling in-store orders, returns, transfers, and ship-from-store. www.shopify.com

Shopify POS

Choose this if: you have one/few stores, a relatively standard retail catalog, and want fewer systems to manage.

Best for more complex omnichannel inventory: Cin7

Cin7 is stronger if inventory itself is the complicated part of your business. It can act as the central inventory/order hub across retail, Shopify, Amazon, WooCommerce, wholesale, warehouses and 3PLs, with real-time stock synchronization. It also supports purchasing, forecasting, multiple locations and more sophisticated fulfillment workflows. www.cin7.com

Cin7

Choose this if: you have multiple warehouses/stores, lots of SKUs, marketplaces, wholesale, 3PLs, or expect the operation to get substantially more complex.

My rule of thumb

One important distinction: don't choose based solely on whether a platform says "omnichannel." The critical question is which system becomes the source of truth for available inventory and how quickly sales, returns, transfers, purchase orders, and reservations propagate to every channel.

If you tell me (1) what your online platform is, (2) what POS you use, (3) number of physical locations, (4) approximate SKU count, and (5) whether you sell on Amazon/eBay/wholesale, I can narrow this to the best 2–3 architectures for your business.

For a brick-and-mortar + online business, I’d make Shopify the first platform I evaluate—especially if you want one system to be the inventory “source of truth.”

My shortlist

Why Shopify: its POS and ecommerce platform natively share inventory, orders, products, and customer data. Inventory can be tracked separately by store/warehouse while syncing across online and in-person channels. It also supports workflows such as buy-online/pickup-in-store, ship-from-store, and online returns in-store. www.shopify.com

If you're selling through Amazon, TikTok Shop, social commerce, or other marketplaces, Shopify can also act as the central inventory layer, although I'd evaluate the exact integrations and inventory-allocation rules you'll need. www.shopify.com

When I wouldn't choose Shopify

I'd lean Lightspeed if your business is primarily sophisticated physical retail and you need deeper retail inventory/POS functionality.

I'd look seriously at Cin7 if you have things like wholesale + DTC + Amazon/eBay + multiple warehouses, significant purchasing/PO workflows, or an ERP-like inventory operation. In that scenario, a dedicated inventory/OMS layer can make more sense than relying primarily on your ecommerce platform.

The key question

The best platform depends less on how many channels you have and more on what your channels are.

If you tell me:

• number of physical stores
• ecommerce platform currently (Shopify/WooCommerce/etc.)
• marketplaces (Amazon, Walmart, eBay, Etsy, etc.)
• approximate SKU count
• whether you do wholesale
• current POS

…I can narrow it down to the 2–3 best fits and explain exactly how I'd architect the inventory sync.

Yes. For a brick-and-mortar + online business, I’d narrow it to Shopify, Lightspeed, and Cin7, with the best choice depending on how complex your inventory operation is.

My recommendation

If your online store is Shopify: start with Shopify POS. Shopify can maintain a shared inventory pool across locations and sync inventory between POS, the online store, and other sales channels in real time. www.shopify.com

If you sell through lots of channels—e.g. Shopify + physical stores + Amazon/eBay + wholesale + 3PL—I'd strongly consider Cin7 as the inventory hub. It supports real-time multichannel inventory, multi-location stock, purchasing/replenishment, and 700+ integrations. www.cin7.com

If the physical retail operation is the heart of the business, Lightspeed is worth a close look; it tends to be stronger than Shopify for sophisticated retail inventory, purchasing, vendors, and multi-location workflows. technologyadvice.com

A useful rule of thumb:

• 1–2 stores + Shopify online → Shopify POS
• Retail-heavy + complex purchasing/catalog → Lightspeed
• Many channels + wholesale/marketplaces/3PL → Cin7
• Shopify/Square already working well but inventory is becoming messy → add Cin7 rather than replacing everything. Cin7 supports both Shopify and Square integrations with two-way inventory synchronization. technologyadvice.comwww.cin7.com

If you tell me what you're using today (POS + ecommerce), number of locations, approximate SKU count, and whether you sell on Amazon/wholesale, I can recommend the best architecture rather than just the best platform.