The Best Inventory Software With 3PL Integrations (And How to Choose One)

You handed fulfillment off to a third-party logistics provider to save time and headaches. Smart move! But here's the catch: if your systems don't talk to your 3PL, you've just traded one headache for another. Overselling. Stockouts. Late nights reconciling spreadsheets that never quite match. This problem is only getting more common, too.

The global 3PL market was estimated at roughly $1.3 trillion in 2022 and is projected to reach about $1.85 trillion by 2027, according to ResearchAndMarkets. That means more brands than ever are handing over their warehouses, and are running into this exact sync problem. The good news? The right inventory software with 3PL integrations gives you back full visibility without adding manual work to your plate. Let's walk through what to look for, what actually syncs, and how to pick a system that keeps you and your 3PL on the same page.

Key Takeaways

• When you outsource fulfillment to a 3PL, your inventory software has to sync orders, stock, and tracking automatically, or you lose visibility fast.
• Most product businesses need an inventory management system (IMS) that connects to their 3PL's warehouse system, not a provider-side WMS or a heavy ERP.
• A true 3PL integration syncs sales orders, purchase orders, inventory receipts, stock levels, and tracking, both ways.
• Native integrations beat custom or middleware connections on cost and reliability.
• Cin7 connects to 125+ 3PLs and 700+ total integrations, keeping brands in sync as they scale.

What Are 3PL Integrations, Really?

Let's define the term plainly, because the internet loves to overcomplicate it. A 3PL integration is simply a connection between your inventory and order software and your 3PL's warehouse system. When the two are linked, orders, stock counts, and shipping details move between them on their own, so nobody has to key data in by hand.

Here's where it gets a little confusing, though. There are really two sides to "3PL software." One side is the software a logistics provider uses to run their warehouse, which is a warehouse management system (WMS). The other side is the software you use as a brand that hands fulfillment to that provider, which is usually an inventory management system (IMS). This article is about the second one, because that's where most product sellers actually sit. As logistics provider Buske Logistics frames it, a 3PL integration links your systems (your e-commerce platform, your marketplaces, your inventory or order software) to the 3PL's WMS and shipping carriers so fulfillment runs automatically from checkout to delivery. Knowing which side you're on changes what you buy, so keep it in your back pocket as we go.

What Data Actually Syncs in a 3PL Integration?

Most articles wave their hands at "syncing" and move on. We won't do that to you. A solid 3PL integration moves a full loop of information, and it's worth seeing the whole thing. Think of it as orders out, tracking in. When a customer buys, the sales order flows from your software to your 3PL, and once it ships, tracking details flow back so you (and your customer) know where the package is.

The same loop happens on the supply side: purchase orders go out to your 3PL, and inventory receipts come back when stock lands in their warehouse. In between, your real-time stock levels stay current across every location, so you're never guessing what's actually available to sell. Stock transfers between warehouses update automatically too, and your product catalog and SKUs push to the 3PL so their system speaks the same language as yours. That's a lot of moving parts!

When it's built right, though, 3PL inventory management software runs this entire loop in the background. No spreadsheets, no copy-paste, no "wait, which number is correct?" moments. You just get an accurate picture, all the time.

Do You Need an IMS, a WMS, or an ERP?

Here's a question almost nobody answers for you, and it's the one that saves you the most money. Three letters get thrown around a lot, so let's sort out which system you actually need.

Inventory Management System (IMS)

An IMS is the sweet spot for most brands, wholesalers, and manufacturers that use a 3PL. It syncs your sales channels, your stock, and your 3PL, giving you one clear view of everything. This is Cin7's category. We're an IMS, sometimes called "ERP Lite," built for growing product businesses that need power without the weight of a full enterprise system.

Warehouse Management System (WMS)

A WMS runs the physical warehouse itself: bin locations, picking routes, packing stations, the works. Usually, this is your 3PL's tool, not yours. If you've outsourced fulfillment, you generally don't need to buy your own 3PL warehouse management software, because your provider already has one. You just need to connect to it.

Enterprise Resource Planning (ERP)

An ERP tries to run your entire company, from finance to HR to manufacturing. It's heavy, it's expensive, and for a lot of growing product businesses, it's overkill. As HashMicro points out, matching your system type to your actual complexity and location count matters, because the wrong choice wastes IT budget and causes operational disruption. For most sellers using a 3PL, the answer is an IMS that integrates cleanly, not a WMS you don't need or an ERP you'll never fully use.

Features to Look for in Inventory Software With 3PL Integrations

Ready to shop? Here's the practical checklist. Keep it handy when you're comparing options for inventory software with 3PL integrations, because these features separate the tools that actually help from the ones that just claim to.

• Native 3PL connections. Look for built-in connectors rather than third-party middleware bolted on the side. They're steadier and cheaper to run.
• Real-time, two-way sync. Data should flow both directions instantly, so orders, stock, and tracking are always current.
• Multi-3PL and multi-location support. As you grow, you'll likely add warehouses and providers. Your software should handle that without a fight.
• Multichannel connections. Shopify, Amazon, Walmart, and the rest of your sales channels need to feed into the same system.
• Accounting sync. Native links to tools like Xero and QuickBooks keep your books accurate without double entry.
• Demand forecasting and reporting. Good data helps you buy smarter and avoid both stockouts and overstock.
• Easy setup and real support. A great feature list means little if you can't get it running.
  Match each of these to what a platform actually delivers, not just what its marketing page promises, and you'll separate the contenders from the pretenders quickly.

Native vs. Custom 3PL Integrations (Why It Matters)

Not all connections are created equal, and this is where a lot of businesses get burned. A custom or middleware 3PL integration is essentially a one-off bridge someone builds (and rebuilds) between your systems. It works until it doesn't. These connections tend to break when either side pushes an update, they cost more to maintain over time, and they add extra failure points to a process that's supposed to run itself. Every one of those failure points is a chance for stock counts to drift, orders to stall, or tracking to go dark, and you're usually the one who finds out last.

Native connectors are a different story. They're pre-built, tested, and maintained by the vendor, so when something changes on either side, keeping the link healthy is the vendor's job, not yours. Fewer failure points means fewer surprise stockouts and a lot less firefighting on a random Tuesday afternoon. There's a budget angle here too: custom builds often carry ongoing developer costs and separate connector subscriptions, while native links are simply part of the platform you already pay for. When you're evaluating 3PL integration software, ask a simple question: is this connection built in and maintained for me, or am I signing up to babysit it forever? Your future self will thank you for asking.

How Cin7 Keeps You in Sync With Your 3PLs

So what does this look like with a real platform and a real brand? Let's show you. Our 3PL Connect feature links Cin7 to 125+ 3PLs and their warehouse management systems, and it's part of the 700+ total integrations we offer. It handles that full data loop we walked through earlier: sales orders out and tracking back, purchase orders and inventory receipts, real-time stock levels, stock transfers, and your product catalog, all synced automatically with no spreadsheets in sight. It's native and built in, so there's no extra middleware to subscribe to, and our in-house 3PL specialists help set it up during onboarding. Better yet, you can run multiple 3PLs on one account, splitting fulfillment by region, channel, or product line.

That flexibility is exactly what Glorious, the gaming peripherals brand, needed. They'd outgrown their old system and wanted to fulfill orders based on where customers actually were. With Cin7, they grew their logistics operation from one to three warehouses, added a Hong Kong warehouse for global distribution, unified their inventory data, and now handle thousands of orders a day without a hitch. That's what staying in sync looks like at scale.

Frequently Asked Questions

What Is Inventory Software With 3PL Integrations?

It's an inventory management system that connects directly to your 3PL's warehouse software. Instead of manually updating stock and orders in two places, the two systems share data automatically. You get one accurate view of inventory across your channels and your 3PL.

Do I Need a WMS if I Already Use a 3PL?

Usually not. Your 3PL runs its own warehouse management system to handle picking, packing, and storage. What you need is an IMS that connects to their WMS, so your side stays in sync. Buying your own WMS on top of that is typically redundant.

What Data Syncs Between My Inventory Software and My 3PL?

A good integration syncs sales orders and shipment tracking, purchase orders and inventory receipts, real-time stock levels, stock transfers, and your product catalog. The flow runs both ways. Orders and POs go out, while tracking, receipts, and updated counts come back.

How Many 3PLs Can I Connect at Once?

That depends on your software, but the best 3PL inventory management software lets you run several at the same time. Cin7 supports multiple 3PLs on one account, so you can split fulfillment by region, channel, or product line as you grow.

How Much Does 3PL-Integrated Inventory Software Cost?

Pricing varies by platform, plan, and how many integrations or locations you need, so there's no single sticker price. One thing worth knowing: native integrations help you avoid the extra middleware and connector fees that custom setups often rack up over time.

Stay in Sync as You Scale With Cin7

Outsourcing your fulfillment should give you time back, not take your visibility away. That's the whole point. With the right IMS and native 3PL integrations, you can add partners, open new warehouses, and grow into new regions without your operations coming apart at the seams. The tools you choose today decide how smoothly you'll scale tomorrow, so it's worth getting the decision right. Brands like Glorious have done exactly that, scaling from one warehouse to several while handling thousands of daily orders without breaking a sweat. You can too. We'd love to show you how Cin7 keeps you and your 3PLs perfectly in sync, so you can sell more, stress less, and scale smarter. Request a demo and see it in action.