The All-in-One WMS Built for 3PLs

3PL warehouse management software is a platform 3PLs use to manage inventory, orders, and fulfillment across multiple clients. Zenventory is an all-in-one WMS built for SMB 3PLs, combining multi-client inventory, automated billing, and built-in shipping in one system, so you never have to connect separate tools.

Unlike generic inventory software designed for a single brand or retailer, a 3PL WMS is built around the reality of running a shared warehouse for multiple clients at once. That means separate inventory records per client, automated billing for storage and handling, and a client portal so your customers can check their own order status without calling you.

If you are still managing those workflows across spreadsheets, a shipping app, and a separate WMS, you are not alone. Most SMB 3PLs start there and outgrow it faster than they expect.

Most 3PLs start with a patchwork: a basic WMS for inventory, a shipping app bolted on the side, and a spreadsheet for billing. It works until it does not.

Here is where it breaks down:

Billing reconciled in spreadsheets every month. Storage fees, accessorials, and handling charges get entered by hand, missed, or undercharged. By the time you catch it, the invoice is already out.

A separate shipping app that does not talk to the WMS. You are toggling between two systems to print a label, checking tracking in a third, and wondering why order status is always a step behind.

"Where is my order" emails because clients have no visibility. Every inbound call is time your team spends answering a question the software should answer automatically.

Carrier blame with no audit trail to settle it. When a shipment goes missing, you need a timestamped scan history to prove your warehouse did its job. Without it, you absorb the cost.

These are not edge cases. They are the ordinary cost of running a 3PL on tools that were never built for one.

All client data that flows into Zenventory will get unique identifiers to let the system know which particular client it belongs to. As a 3PL operator, you'll have a global, birds-eye view of all data that you manage, but you can also filter things by client in order to drill down easily when needed. And clients will never be able to access each other's data; they'll only be able to see their own (and only if you choose to grant them portal access).

The goal is self-service capability: Clients can conveniently do what they need to do in Zenventory, so they can skip calling/emailing you for routine tasks or real-time visibility to their data. Client portal access is highly customizable per client, but a client user with maximum access would be able to manage their own SKU catalog, set up their own kits/bundles, see order fulfillment status/create manual orders, manage their list of suppliers, create POs/inbound orders, and even manage their own integration setup.

Yes! Zenventory supports the creation of unique billing scenarios per client, including shipping upcharges, handling fees, receiving fees, storage fees, assembly fees, and even customized miscellaneous charges. You can set these manually in the interface or let the system do it using our powerful automation rules. Once you set up the rules, the system will auto-calculate charges based on activity in the system and provide a handy statement in digital or PDF format for you & your clients.

As warehouse staff complete activities – receiving shipments, picking orders, storing pallets, processing returns – the WMS records each event. The billing engine applies your client-specific rate card and builds an invoice automatically. When the billing period closes, invoices are ready to send or push to QuickBooks. No spreadsheet required.

This feature saves time and minimizes errors by automatically transferring the inbound purchase order details to the outbound customer order, ensuring both orders match and speeding up prep and shipment to destinations like Amazon warehouses. 

A 3PL WMS must support multiple clients, complex billing rules, warehouse transfers, client portals, and revenue reporting (capabilities that standard retail WMS platforms typically lack).

Zenventory offers direct integrations to all major marketplaces, such as Shopify, Amazon, and eBay. If you use ShipStation to consolidate order integrations, our robust integration to ShipStation is fully 3PL-ready and allows assignment of ShipStation stores to your Zenventory clients, so orders will always land in the right place. Need more options? We offer a well-documented REST API, an easy-to-use CSV import tool, and an option in the client portal for them to create manual orders directly in Zenventory.

Nope! You don't need a separate shipping system.

Our shipping engine, ZenShip, is a full shipping engine that rivals the best standalone systems.

From label generation to carrier invoice reconciliation, ZenShip centralizes everything so you can ditch the platform hopping (and the extra subscriptions that come with it).

Also, when you ship with Zenventory, you get access to:

• Multi-carrier support (including USPS, UPS, FedEx, DHL eCommerce, and Canada Post) for in app label printing.
  
  
• Built-in rate shopping that automatically surfaces the cheapest shipping option available - no extra clicks required.
  
  
• High-velocity batch shipping that not only speeds up fulfillment, but also notifies you if a better shipping rate is available.
  
  
• Centralized billing, audit-ready carrier invoice reconciliation, and integrated claims management, giving you oversight and control from one spot.
  
  
• Unlimited users, no hidden fees, and enterprise-grade functionality that's been shaped for both e-commerce and 3PL operations.

Yes! You can add your own company branding elements to the interface to give it a unique look & feel. Clients will see your logo & color scheme when they log in rather than Zenventory's, and help requests from your clients in our interface will be redirected to your own support team's email or ticketing system.

Here are the steps to cross-dock a purchase order with a customer order in Zenventory:

• First, create a new purchase order in Zenventory
• On the final creation screen, check the box labeled "Cross-Dock this PO"
• Click the orange "Confirm" button to finalize
•  You'll be redirected to create the linked customer order, with all items and quantities already copied over
• Last step is to enter the Customer information and finalize the Customer Order 
• And voila! That's it!

Zenventory starts at $249/month for new customers (standard rate: $499/month), which includes up to 10,000 shipments, 1 warehouse, and unlimited clients, users, products, and integrations. The Growth plan is $399/month for new customers (standard: $799/month) and covers up to 50,000 shipments across 3 warehouses.