Walmart Marketplace is the second-largest eCommerce platform in the U.S., and it is growing fast. In 2024, Walmart’s global eCommerce sales hit $100 billion. More than 150,000 active sellers are already there, and more are joining every month.
Here is the thing: most sellers set up their account, list their products, and then stop. They never fully use the tools Walmart has built to help them manage and grow their business. The Walmart Seller app and the Seller Center App Store are two of the most underutilized resources on the platform.
This guide covers both. You will learn what each one does, how to use them, and how to choose the right tools to grow profitably on Walmart Marketplace.
Trellis has helped brands of all sizes grow profitably on Walmart Marketplace. See the results for yourself by checking out our client success stories.
Key Insights
- The Walmart Marketplace App Store and the Walmart Seller app are two separate tools.
- Solution Providers are optional but strategic.
- Advertising and pricing are the highest-impact areas to automate first.
Read more: 7 Walmart Pricing Plays to Boost Profit in 2026
What Is the Walmart Marketplace App Store?
When sellers search “Walmart Marketplace App Store,” they are usually looking for one of two things. It helps to know the difference before going any further.
The first is the Walmart Seller app – a mobile application available on iOS and Android. It lets you manage your Walmart business from your phone. Think order management, inventory updates, customer messages, and sales tracking on the go.
The second is the App Store inside Seller Center – a directory of pre-approved, third-party software providers that integrate directly with your Walmart Marketplace account. These are tools built to help you automate, optimize, and scale your operations across advertising, pricing, fulfillment, and more.
Both are valuable. They serve different purposes. Most guides cover one or the other. This one covers both.
The Walmart Seller App: Manage Your Business on the Go
The Walmart Seller app is a free mobile app for existing U.S. Marketplace sellers. It is available on iOS and Android. You use your Seller Center login credentials to access it.
It is not a replacement for Seller Center on desktop. It is a companion tool, built for the tasks you need to handle quickly, from anywhere.
Key Features of the Walmart Seller App
Here is what you can do directly from the app:
- Catalog management: Add new items by matching products in Walmart’s catalog, view item details, update pricing, adjust inventory levels, and scan barcodes to find products instantly
- Order management: Acknowledge, ship, cancel, and refund orders; print packing slips; mark orders as shipped; and track Walmart Fulfillment Services (WFS) shipments
- Push notifications: Get real-time alerts for new orders, at-risk orders, out-of-stock inventory, and customer messages
- Sales Tracker: View daily, weekly, and monthly revenue performance from your home screen
- Message Center: Respond to customer inquiries, attach images and files, and stay on top of your seller response rate
- Payment statements: View your payout history and statement details
- Support cases: Create, view, and manage support tickets without opening a browser
Recent updates have also added a Seller Forum within the app, so you can connect with other Marketplace sellers and get answers on the go.
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How to Download and Log In
Download the Walmart Seller app from the App Store (iOS) or Google Play (Android). Android users can also download and install the .apk file directly from Walmart’s Marketplace Learn site.
Once installed, log in using your existing Seller Center credentials. If you are new to Walmart Marketplace, you need an active Seller Center account before you can use the app.
A few country restrictions apply. The iOS version is not available in China or countries subject to OFAC sanctions. The Android version adds Canada, Chile, and Mexico to that list. The app is designed for U.S. Marketplace sellers.
Read more: Endemic Advertising Explained: How Brands Are Winning on Amazon and Walmart
What the App Can Not Do
The Walmart Seller app covers the essentials, but it does not replace Seller Center entirely. Some tasks still require a desktop.
You cannot manage user roles or permissions from the app. Updating two-step verification settings is also not supported on mobile. Certain advanced catalog and reporting functions are only available through the full Seller Center interface.
If a feature is not available in the app, Walmart’s guidance is simple: log in to Seller Center on your desktop to complete the task. Think of the app as your day-to-day dashboard and Seller Center as your full command center.
What Is the Seller Center App Store?
Inside Seller Center, under the Apps section in the left-hand navigation, you will find the App Store. This is not an app you download. It is a marketplace of pre-approved, third-party software providers that connect directly to your Walmart Marketplace account.
Walmart has vetted and approved every provider listed here. That matters because it means these integrations are secure, compliant with Walmart’s data standards, and built to work with the Marketplace system, not around it.
The App Store exists because no single platform can do everything. Walmart builds the infrastructure. The App Store brings in specialized tools that help sellers go deeper on specific areas of their business. As a seller, you get to choose which ones make sense for where you are right now.
You can connect one provider or several. You can disconnect them at any time. There are no commitments baked into the connection itself.
Read more: How to Create a Seller SKU on Walmart Seller Center
What Are Walmart Solution Providers?
Solution Providers are the companies listed in the Seller Center App Store. They are third-party businesses that have gone through Walmart’s approval process and built integrations with the Marketplace system. They exist to help sellers run more efficiently and grow more profitably.
Using a Solution Provider is completely optional. Plenty of sellers manage their Walmart business manually through Seller Center. However, as your catalog and order volume grow, manual management gets expensive, in time if not in money. That is where Solution Providers become worth looking at seriously.
Here are the main categories of tools available through the App Store:
- Advertising and pay-per-click (PPC) management: Automate and optimize Walmart Connect campaigns, including Sponsored Products and Sponsored Brands
- Dynamic repricing and Buy Box optimization: Automatically adjust prices to stay competitive and protect your Buy Box position
- Listing and catalog management: Streamline item setup, content updates, and Listing Quality Score improvements
- Inventory and order management: Sync inventory across channels, manage orders in bulk, and reduce manual work
- Fulfillment and shipping: Connect with third-party logistics (3PL) providers and manage WFS workflows
- Analytics and market intelligence: Access deeper reporting on performance, competitors, and shopper behavior
- Multichannel selling: Manage your Walmart catalog alongside Amazon, Shopify, and other platforms from one place
How to Connect a Solution Provider in Seller Center
Connecting a Solution Provider is straightforward. Here is the step-by-step process.
Step 1: Open the App Store
Log in to Seller Center and navigate to Apps in the left-hand navigation panel. Select App Listings to browse the available providers.
Step 2: Browse and Choose a Provider
You can browse by category or search by name. Take your time here. Look at what each provider covers and whether it matches the part of your business you want to improve. You can connect more than one provider if you need specialized tools for different functions.
Step 3: Click Connect
Once you find a provider, select the Connect button on their listing. This will redirect you to the provider’s website, where you will need to create an account or log in if you already have one.
Step 4: Authorize Access
After logging in, review the authorization details on the provider’s site. If you agree to their privacy policy, select the checkbox and click Authorize. This step uses OAuth 2.0, an industry-standard security protocol that lets the provider access your Marketplace data without ever seeing your
Walmart password. It is the same authorization standard used by most major software platforms.
Step 5: Manage and Renew
All your connected apps appear under Connected Apps in the App Store section of Seller Center. Walmart requires annual renewal of OAuth 2.0 authorization for each connected app. When it is time to renew, navigate to Connected Apps, find the app, and select Renew. To disconnect a provider entirely, select Revoke next to their name. This immediately removes their access to your account data.
Read more: What Is a Good Walmart ROAS?
One note worth knowing: not every provider in the App Store has a Connect button yet. Only those that have implemented OAuth 2.0 can be connected this way. Others still use delegated API keys through the Developer Portal. Both methods work. The Connect button is simply the newer, more streamlined approach.
How to Choose the Right Solution Provider for Your Business
With dozens of providers available in the App Store, the hardest part is knowing where to start. The best approach is to start with the problem, not the product.
Identify the area of your business where you are losing the most time or leaving the most money on the table. If you are spending hours adjusting bids manually, an advertising automation tool should be first on your list. If your Buy Box win rate is low, a repricing tool will have a faster impact than anything else you could add.
Look for providers that are Walmart-approved and listed in the App Store. Avoid third-party tools that are not on the approved list, they have not been through Walmart’s vetting process and could put your account at risk.
Also think about coverage. Some Solution Providers specialize in one area, like shipping or catalog setup. Others are built as all-in-one platforms covering advertising, pricing, analytics, and content in a single dashboard. If you are managing a large catalog across multiple marketplaces, an integrated platform will almost always be more efficient than stitching together five separate tools.
Before committing to any provider, ask about pricing structure, contract terms, and what level of onboarding or support they offer. Each provider sets its own pricing and contract terms, so there is no standard to compare against…you need to ask directly.
Finally, do a yearly review of your connected providers. If a tool is no longer delivering value, revoke its access and reassess. The App Store is designed to grow and change with your business.
What to Look for in a Walmart Advertising and Pricing Tool
If you are only going to connect one or two Solution Providers, advertising and pricing are the two areas that will move the needle fastest.
On the advertising side, Walmart Connect offers Sponsored Products, Sponsored Brands, and Display ads. Managing bids, budgets, and keywords manually is manageable when you have 20 products. At 200 products across multiple campaigns, it becomes a full-time job with no guarantee of consistency. An advertising automation tool handles bid adjustments, keyword harvesting, and campaign structure in the background — so your spend is always working toward your return on advertising spend (ROAS) and advertising cost of sale (ACoS) goals, not just burning through budget.
On the pricing side, the Buy Box on Walmart is heavily influenced by price. Sellers who respond to competitor pricing changes in real time have a significant advantage over those who update prices weekly or manually. A dynamic repricing tool watches competitor listings and adjusts your prices automatically within the rules you set, protecting your margins while keeping you competitive. For sellers managing inventory fluctuations or trying to maintain minimum advertised price (MAP) compliance across channels, automated repricing is not a nice-to-have — it is a necessity.
Together, advertising automation and dynamic pricing address the two biggest levers for profitability on Walmart Marketplace. Get these right, and everything else becomes easier to optimize.
How Trellis Helps Walmart Sellers Grow
Trellis is an approved Solution Provider on Walmart Marketplace, integrated directly with Walmart Connect through the Seller Center App Store. It is built as a full-funnel profitability platform, which means it goes beyond advertising or repricing alone.
With Trellis, Walmart sellers get AI-powered advertising automation that manages bids, keywords, and campaign structure across all ad types. The platform’s dynamic pricing uses machine learning to find the right price for every product in your catalog, balancing Buy Box competitiveness, margin protection, and inventory velocity at the same time. Trellis also covers listing optimization, connecting your organic keywords with your highest-converting ad terms, and market intelligence dashboards that show you what is actually driving performance.
For sellers managing large catalogs or running complex campaigns across both Amazon and Walmart, Trellis handles the operational load that would otherwise require a full team. Brands using the platform have seen measurable improvements in ROAS, conversion rates, and profit per session — not by running more ads, but by running smarter ones.
Trellis offers self-service access for sellers who want to stay hands-on, as well as a Strategic Management option for brands that want a dedicated team handling execution alongside the software. There are no long-term contracts required to get started.
If you are ready to see what AI Precision + Human Intuition looks like in practice on Walmart Marketplace, schedule a demo with Trellis to see the platform in action.
In Summary: Start Selling Smarter on Walmart Marketplace
The Walmart Seller app puts the most important day-to-day management tasks in your pocket. The Seller Center App Store gives you access to a vetted ecosystem of tools that can automate the work, sharpen your strategy, and free up your time for the decisions only you can make.
Building the right tech stack on Walmart does not have to be complicated. Start with the areas of your business that need the most attention. Connect the tools that address those gaps. Review what is working. Grow from there.
Trellis is ready to help. From advertising automation to dynamic pricing to full-funnel analytics, it is built to support Walmart sellers at every stage of growth.
See how Trellis works for Walmart sellers or schedule a demo to get started.
