Threecolts Threecolts
PricingPricing
Log In Log In Get Started Get Started
  • Margin Pro
  • UniCon
  • Seller 365
  • Onsite Support
  • AI OperatorComing soon
  • Retail 365Coming soon
  • Online Arbitrage
  • Retail Arbitrage
  • Wholesale
  • BrandsNew
  • 1P Vendors
  • 3P Sellers
  • Blog
  • Knowledge Base
  • Threecolts University
  • Wall of Love
Pricing
Log In Log In Get Started Get Started
Margin Pro Find and recover margin lost to deductions, fees, and overcharges. UniCon Launch and manage your catalog on major marketplaces. Onsite Support Turn every support ticket into an operational workspace.
AI OperatorComing soon Automate routine seller operations with an always-on AI teammate.
Retail 365Coming soon One connected view of your Amazon Vendor P&L.
Seller 365 Run your entire seller operation with ten tools in one subscription.
  • InventoryLab
  • Tactical Arbitrage
  • FeedbackWhiz Emails
  • FeedbackWhiz Alerts
  • FeedbackWhiz Profits
  • SmartRepricer
  • InventoryLab Accounting
  • ScoutIQ
  • Scoutify
  • ScoutX
Business model
  • Online Arbitrage
  • Retail Arbitrage
  • Wholesale
  • BrandsNew
Fulfillment model
  • 1P Vendors
  • 3P Sellers
Services
  • Vendor Recovery
  • Seller Reimbursements
  • Carrier Optimization
Case Study David Protein’s frictionless expansion story. Case Study How Acquco recovered $3M in hidden margin. Case Study How Modway saved $2.7M with zero risk.
Learn
  • Blog
  • Podcasts
  • Knowledge Base
  • Threecolts University
Connect
  • About Us
  • Wall of Love
  • Seller Advocacy
Become an
Agency Partner
Join Now
Join the
Affiliate Program
Join Now
★★★★★ 4.5 ★★★★★ 4.9 ★★★★★ 4.6

Inventory management software built for scale

Too many sellers waste hours juggling shipments, spreadsheets, and stock counts. An inventory management software gives you the speed, accuracy, and visibility you need to manage everything without the chaos.

Get InventoryLab in Seller 365
Inventory Management Software Hero
Speed up inventory management

Inventory management shouldn't slow you down... or leave your finances in the dark.

Seller Central workflows are clunky, and spreadsheets only go so far. Whether you're listing new products or prepping 1,000 SKUs for FBA, manual work costs you time... and errors cost you money.

InventoryLab simplifies the two areas sellers care about most: Fast, accurate FBA listing and shipment creation with clean, accountant-ready financial tracking.

Everything flows through one easy system. So, you can ship faster, stay organized, and actually understand your profits.

What our customers say

One of the most important pieces of software

I consider InventoryLab one of the most important pieces of software in my Amazon arbitrage business. I only wish I had discovered it sooner.

Steve C.
Steve C.
Amazon Seller

Here’s what InventoryLab gets you

Real-time

Prep & ship in minutes

Add products, print labels, and create shipments in seconds—not hours. No more clunky Seller Central interfaces.

Buy Box optimization

Inventory tracking

See what's in stock, what's inbound, and what's sold with live updates for full visibility.

Custom rule builder

Box & label with precision

Smart workflows guide you through box creation, contents, and label printing.

Global marketplace support

Track costs and margins

Track every fee, COGS, and shipping charge automatically so you always know your true profit per SKU.

Profit protection

Tax-ready reporting

InventoryLab Accounting's built-in reports make sales tax filing and accounting simple, accurate, and exportable.

Performance insights

Seamless FBA workflows

Streamline FBA listing and shipment creation. Using FBM? Manage listings and stock levels in the same place.

Start Managing Inventory the Easy Way

What you can do with powerful inventory management software

Inventory management benefits

Handle high volumes without slowing down

InventoryLab makes batch operations simple, so whether you're prepping 10 SKUs or 10,000, it's all managed through streamlined workflows.

Prevent shipment errors before they happen

Built-in validation, auto-formatted labels, and Amazon-compliant box contents help you ship with confidence—and avoid delays or rejections.

See your true profit, not just revenue

InventoryLab tracks every detail—from cost of goods to shipping fees to Amazon charges—so you can make better pricing and sourcing decisions with real data.

Manage every shipment from one place

See every product, every label, every fulfillment status from a single command center. No more hopping between spreadsheets, tabs, or disconnected tools.

Prep & Ship Smarter Today
Seller 365
Seller 365

One tool, plus nine more –
for less than the price of one

InventoryLab is just one of 10 powerful apps included in Seller 365, our all-in-one software bundle designed to help Amazon sellers scale smarter. For just $69/month, you get access to:

  • InventoryLab for prepping, boxing, and shipping
  • SmartRepricer for automated, competitive pricing
  • Tactical Arbitrage for profitable product sourcing
  • FeedbackWhiz for reviews, profits, and alerts
  • …and more!

Instead of paying for 5+ separate subscriptions, Seller 365 gives you a full‑stack selling solution. Save 80% in tool costs and win across every stage of your Amazon business.

Try Free for up to 14 Days

Make inventory management the easiest part of your business

Prep faster, ship with confidence, and get total visibility. InventoryLab simplifies every step.

Start Your Free Trial of Seller 365

Frequently asked questions.

  • Inventory management software helps ecommerce sellers organize, track, and control their stock. You use it to monitor what's in inventory, what's sold, and what needs to be restocked.

  • Amazon inventory management refers to how sellers track, organize, and replenish their products stored in Amazon fulfillment centers (FBA) or their own warehouses (FBM). It includes managing stock levels, shipments, labels, and profitability across your entire catalog.

  • You can, but it's time-consuming, error-prone, and hard to scale. Tools like InventoryLab replace spreadsheets with automation to ensure faster workflows, fewer mistakes, and clear visibility into every product, shipment, and cost.

  • The best inventory management software depends on your business size and fulfillment model, but sellers often choose InventoryLab for its smart prep workflows and built-in profitability tools. It's built specifically for ecommerce sellers.

  • InventoryLab is optimized for FBA, but also supports merchant-fulfilled (FBM) workflows. This gives you complete control, no matter how you ship.

Trusted by the best.
Find out why.

Get Started Get Started Book A Strategy Session Book A Strategy Session
Threecolts

Products

  • Margin Pro
  • UniCon
  • Seller 365
    • InventoryLab
    • Tactical Arbitrage
    • FeedbackWhiz Emails
    • FeedbackWhiz Alerts
    • FeedbackWhiz Profits
    • SmartRepricer
    • InventoryLab Accounting
    • ScoutIQ
    • Scoutify
    • ScoutX

Solutions

  • BrandsNew
  • Online Arbitrage
  • Retail Arbitrage
  • Wholesale
  • 1P Vendors
  • 3P Sellers

Services

  • Vendor Recovery
  • Seller Reimbursements
  • Carrier Optimization

Resources

  • Blog
  • Podcasts
  • Knowledge Base
  • Threecolts University

Partner

  • Partner Program
  • Affiliate Program

Company

  • About Us
  • Careers
  • Seller Advocacy
  • Wall of Love
  • Legal
Follow us:
System status © 2026 Threecolts. All rights reserved.