InventoryLab vs Sellerboard: Which Tracks Profit Better

1. The Short Answer

If you do online or retail arbitrage and list your own batches, InventoryLab fits the way you work. You enter the buy cost while you create the listing, so your profit numbers start clean.

If you sell private label, run PPC, or push thousands of orders a month, Sellerboard fits better. It is built around a live profit dashboard with ads, inventory and refunds in one place.

Both answer the same question: did that unit make money after Amazon took its cut? They get the inputs from different places, and that difference decides which one you should pay for.

2. What InventoryLab Does

InventoryLab started as a listing and accounting tool for resellers. Today it sits inside Threecolts' Seller 365 bundle and is still sold on its own. If you used Tactical Arbitrage, you have seen the same move. The Seller 365 breakdown covers what changed.

The vendor page lists these pieces (InventoryLab on Threecolts):

• FBA and FBM listing creation, including bulk listing for wholesale
• Buy cost tracked line by line on every unit you list
• Scoutify for mobile sourcing, with profit insights and buy list integration
• P&L reporting by product, supplier and category
• InventoryLab Accounting, which syncs sales, refunds and reimbursements from Amazon's Finance API and settlement reports

"So, there's a couple software systems out there. I think Is it Is it Inventory Lab, Box Em? I recommend getting one of those. That will help you track your inventory and help you with your numbers if you want to go that route."

$0 to $4 Million With Amazon FBA: The Complete Strategy

3. What Sellerboard Does

Sellerboard starts from the other end. You connect your seller account and it builds a profit dashboard from your orders, fees, ads and refunds as they land.

Its pricing table lists (sellerboard.com):

• A real-time profit dashboard and automated reports
• PPC optimization and a repricer
• Inventory management
• Refunds for lost inventory
• Listing change alerts and an LTV dashboard
• User access rights by account, marketplace and product

Most of that list serves a seller who owns listings. An arbitrage seller with 400 different ASINs and no ad spend will use maybe half of it.

4. Pricing Side by Side

Prices below come from each vendor's site when we checked in October 2026. Confirm them at checkout before you buy.

• InventoryLab standalone: shown at $58 a month (struck through from $69), with a 30-day free trial
• Seller 365 Standard: $65 a month, one user, 14-day trial, InventoryLab included
• Sellerboard Standard: $19 a month billed monthly, up to 3,000 orders a month
• Sellerboard Professional: $29 a month, up to 6,000 orders
• Sellerboard Business: $39 a month, up to 15,000 orders
• Sellerboard Enterprise: $79 a month, up to 50,000 orders

Sellerboard offers a one-month free trial with no card required and discounts annual billing. Sellerboard costs less to start. InventoryLab costs more but folds listing and accounting into the same login.

5. The Real Difference Is Where Your Buy Cost Comes From

Any profit report is only as good as the cost of goods you feed it. Amazon knows its fees. Amazon has no idea you paid $14.20 for that blender at Kohl's with a 20% coupon.

InventoryLab asks for the buy cost at the moment you list the unit. For an OA seller buying 30 different products a week, that step removes a whole data entry job. You type the cost once, while the receipt is still in front of you.

Sellerboard needs your cost of goods too, entered or imported per product. That works fine for a brand with 20 SKUs and a stable landed cost. With hundreds of one-off arbitrage buys, test the import on your own data during the trial before you commit.

6. The Numbers You Need From Either Tool

Profit per unit matters, but cash speed decides how fast you grow. Pick a tool that shows you how long your money sits in inventory.

"So what does your inventory turnover looks like? So when you spend $1 into the business, how long does it take you to turn it into like $1.60 or $1.40 to $1.60 in your case cuz that was your return on investment. You need to be turned every 30 days."

$0 to $4 Million With Amazon FBA: The Complete Strategy

Three reports to check in any trial: profit by SKU after all fees, inventory age, and sell-through. Our sell-through rate guide covers the math if your tool doesn't show it.

7. 2026 Costs Your Profit Tool Has to Catch

Amazon stopped US FBA prep and item labeling on January 1, 2026, and ended commingling on March 31, 2026. If you aren't the Brand Representative, every unit you send needs an FNSKU label you print yourself or pay a prep center to apply.

Amazon doesn't bill that label, so neither tool will see it in the settlement data. Add your label and prep cost per unit to your buy cost, or your margins will look better than your bank account. The FNSKU labeling guide walks through the setup.

Fees Amazon does charge, like the inbound placement fee, the low-inventory-level fee and aged inventory surcharges, show up in your settlements. Check that your tool assigns them to the right SKU and not to a "miscellaneous" bucket.

8. Who Should Pick InventoryLab

Pick InventoryLab if you:

• Buy lots of different ASINs in small quantities
• List your own shipments or create listings before your prep center ships
• Want listing, buy cost and bookkeeping data in one place for tax time

The Seller 365 bundle makes sense if you would pay for Tactical Arbitrage anyway. If you only need the accounting side, compare the standalone price against your monthly profit before you sign up.

9. Who Should Pick Sellerboard

Pick Sellerboard if you:

• Run PPC and want ad spend inside your profit numbers
• Sell a smaller catalog where cost of goods stays stable
• Want order-count pricing that starts low and grows with you

Wholesale sellers often land here. The cost per unit stays the same across reorders, so entering it once covers months of sales. The wholesale sourcing guide explains how that model differs from OA.

10. Run Both, Run One, or Use a Spreadsheet

Some sellers list with InventoryLab and watch daily profit in Sellerboard. That works, but you pay twice to answer one question. Start with one tool, run it for a full month, then decide.

In your first months, a spreadsheet with buy cost, sale price and Amazon's settlement totals can carry you. Once you buy dozens of new SKUs a week, the hours you spend reconciling cost more than either subscription.

If you want to see how I track numbers on real products, grab a seat at the free Thursday training.

11. Where Sourcing Tools Fit

Neither tool finds you products. They report on products you already bought. Your profit tracking can't fix a thin pipeline of leads.

Full disclosure: I built Arbitrage Stalker, which tracks competitor storefronts and alerts you when they add new products. It sits at the front of the process, before InventoryLab or Sellerboard ever see a unit.

For the rest of the sourcing stack, read the best online arbitrage software roundup and the scaling pillar.

12. Next Steps

Pick your tool, then tighten the numbers you feed it. These five posts help:

• Amazon FBA Fees Explained - every fee your profit tool should catch in 2026
• Amazon FBA Calculator - run the per-unit math before you buy
• Amazon Sell-Through Rate - the speed metric that decides how fast you grow
• The FBA Cash Flow Trap - why a profitable store can still run out of money
• Best Online Arbitrage Software - the sourcing side of your tool stack