5 Best Inventory Forecasting Software for eCommerce Brands

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Inventory is the lifeblood of any eCommerce business. Too little stock? You're losing sales. Too much? You're sitting on cash that could be working harder elsewhere. Either way, mismanaged inventory can quietly destroy margins and throttle growth. That’s why smart inventory forecasting can be that secret sauce that fuels your business growth.

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The right inventory forecasting software helps you strike that balance between availability and efficiency. It can tell you what to restock, when to restock it, and even what not to bother with. Whether you're scaling up your DTC brand or juggling multiple marketplaces, having reliable demand forecasting tools in your stack is non-negotiable.

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In this guide, we’ll break down how inventory forecasting actually works, why it matters, and which platforms are best suited to help you make smarter stock decisions.

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How to Forecast Inventory (and Why It Matters)

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What is Inventory Forecasting?

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Inventory forecasting is the process of predicting how much stock your business will need in the future based on historical data, seasonal trends, promotions, and external factors. It’s part science, part strategy, and when done right, it becomes a powerful lever for growth.

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There are a few different methods businesses use to forecast demand:

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• Time-Series Forecasting: Using past sales data to spot trends over time.
  
  
• Moving Averages or Exponential Smoothing: Great for short-term demand patterns.
  
  
• Demand Planning with Marketing Inputs: Factoring in planned campaigns or seasonal events.
  
  
• AI Models: Advanced systems (like Conjura) that use a blend of data sources and learn from patterns to make highly accurate predictions.
  
  

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Why Forecasting Inventory Matters

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eCommerce brands live and die by their stock management. When your forecasting is off, the impact ripples through every corner of the business.

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• Overstocking leads to capital being tied up in unsold inventory, plus storage costs, potential obsolescence, and markdowns.
  
  
• Understocking creates lost sales, frustrated customers, and a direct hit to your lifetime value (LTV) and customer retention.
  
  
• Stockouts + Ad Spend = 🔥💸 Imagine running Facebook or TikTok ads for a product that’s out of stock…ouch!
  
  

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A good inventory forecasting tool doesn’t just tell you what’s trending; it ties your stock insights to customer demand, marketing activity, and profitability.

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When Should You Invest in Forecasting Software?

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You might be ready for dedicated forecasting software if:

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• Your SKU count has grown and manual tracking just isn’t cutting it
  
  
• You frequently oversell or have stale stock gathering dust
  
  
• You're launching in new regions or expanding to new channels
  
  
• You’re struggling to sync marketing and operations
  
  
• You want to make stock decisions based on profit, not just volume
  
  

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If that’s you, keep reading. These five platforms are designed to help you move from reactive inventory management to proactive, profit-first planning.

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The 5 Best Inventory Forecasting Software for eCommerce

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Let’s dig into the top tools that are helping eCommerce brands forecast with confidence. 

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1. Conjura (Best Overall for eCommerce Brands Focused on Profitability)

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If your goal is to grow profitably, and not just chase revenue, Conjura should be your forecasting weapon of choice. It’s not just another dashboard. It’s a full analytics platform designed to help eCommerce brands connect inventory, marketing, and product performance in one place.

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Why it stands out:

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• Conjura is the only platform that offers SKU-level ad spend attribution, enabling true contribution profit analysis.
  
  
• Its inventory forecasting uses AI models that learn from product trends, conversion rates, ad performance, and seasonality.
  
  
• It doesn’t just tell you what to reorder, it recommends which products to stop promoting, discount, or even discontinue based on ROI.
  
  
• The system syncs with Shopify, BigCommerce, Amazon, Meta, Google Ads, eBay, TikTok, and more, so your entire performance stack lives in one place.
  
  

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Best for: DTC and multichannel brands who want inventory insights that go beyond demand and into profitability.

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Pros:

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• Predicts future stock needs with marketing data in mind
  
  
• Actionable product recommendations powered by Owly AI
  
  
• Beautiful UI with product images and customizable views
  
  
• Daily performance emails to keep your team aligned
  
  
• Excellent customer support and rapid development cycle
  
  
  

Pricing: Starts at $299/month and scales by GMV

👉 Learn more about Conjura’s AI-powered inventory forecasting

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2. Cin7

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Cin7 is a full-featured inventory and order management platform built for omnichannel retailers. It includes forecasting, warehouse management, POS systems, and integrations with shipping providers.

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Best for: Retailers with complex operations, physical stores, or wholesale channels.

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Key Features:

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• Multi-location demand planning
  
  
• Real-time inventory visibility across sales channels
  
  
• Automated purchase orders and reorder alerts
  
  

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Pros:

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• Great for complex supply chains
  
  
• All-in-one solution (inventory, orders, POS)
  
  
• Connects with popular marketplaces like Amazon, Walmart, and eBay

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• Integrates with Conjura
  
  

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Cons:

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• Can be overkill for some DTC brands
  
  
• Not focused on marketing performance or profitability metrics
  
  
  

Pricing: Starts around $325/month, depending on modules and integrations

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3. Inventory Planner by Sage

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Inventory Planner by Sage is a powerful yet user-friendly forecasting tool trusted by thousands of Shopify and Amazon sellers. Its primary focus is to help brands optimize purchasing by identifying what to reorder and when.

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Best for: Growing eCommerce businesses using Shopify, Amazon, or WooCommerce who need fast, data-backed purchasing decisions.

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Key Features:

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• Replenishment recommendations based on sales velocity and seasonality
  
  
• Forecast demand at SKU level across multiple warehouses or sales channels
  
  
• Purchase order creation and syncing
  
  

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Pros:

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• Integrates with many eCommerce platforms and marketplaces
  
  
• Quick to set up, with strong pre-built reporting
  
  
• Great visualizations for stock coverage and cash flow planning

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• Integrates with Conjura
  
  

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Cons:

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• Doesn’t tie into marketing or customer analytics
  
  
• Lacks advanced profitability analysis
  
  

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Pricing: Starts around $129/month, with pricing scaling based on order volume

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4. NetSuite Demand Planning

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NetSuite is the heavyweight in this list and for good reason. As part of Oracle's cloud ERP platform, its demand planning tools are built into a full suite of finance, inventory, and supply chain modules.

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Best for: Large-scale or enterprise eCommerce businesses needing deep ERP functionality and global inventory management.

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Key Features:

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• Statistical forecasting using historical sales data and trends
  
  
• Supports multiple forecasting methods (e.g., moving average, linear regression)
  
  
• Integrated financials, purchasing, and warehouse operations
  
  

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Pros:

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• Powerful and highly configurable
  
  
• Centralized platform for inventory, finance, and procurement
  
  
• Ideal for multi-location and multi-currency operations
  
  

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Cons:

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• Not purpose-built for DTC or fast-moving consumer brands
  
  
• Complex onboarding and setup time
  
  
• No marketing integration, doesn't connect demand with ad performance

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• Very expensive
  
  

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Pricing: Custom (typically starts in the thousands per month)

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5. Cogsy

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Cogsy positions itself as a “revenue planning” tool for eCommerce, with a strong emphasis on aligning inventory with marketing campaigns. It aims to bridge the gap between ops and growth teams.

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Best for: Brands scaling quickly that want to better align marketing, inventory, and finance without the bloat of a full ERP.

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Key Features:

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• Forecasts inventory needs based on sales velocity and marketing calendars
  
  
• Helps create purchasing plans and automate PO creation
  
  
• Syncs with Shopify, Amazon, and third-party logistics platforms
  
  

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Pros:

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• Clean, modern UI
  
  
• Forecasting models adapt as new data comes in
  
  
• Helps ensure you’re not promoting what you’re about to run out of
  
  

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Cons:

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• Not as robust for more complex businesses (e.g., multi-warehouse, B2B)
  
  
• Doesn’t offer deep ad performance or customer profitability insights
  
  

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Pricing: Starts at $499/month

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Conjura + Cin7: Profit-First Forecasting for Complex Inventory Ops

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If you’re using Cin7 to manage your inventory, warehousing, and fulfilment across multiple channels, Conjura acts as the profitability layer that Cin7 doesn’t offer natively.

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How the integration works:

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• Conjura pulls in real-time inventory data from Cin7, including:
  
  
  
  • Stock levels
    
    
  • Purchase order status
    
    
  • Reorder points
    
    
  • Forecasted demand by location/channel
    
    

• It then combines that data with your performance metrics:
  
  
  
  • SKU-level ad spend from Google, Meta, TikTok
    
    
  • Product views and conversion rates
    
    
  • Contribution profit per SKU, campaign, and channel
    
    

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Why it’s a game-changer:

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• Smarter Reordering: Don’t just reorder based on demand—reorder based on profit potential.
  
  
• Full visibility: Understand which SKUs are driving growth, which are dragging margins, and where you’re overspending on stock.
  
  
• Ops meets marketing: Align your promotions with products that have strong performance and healthy stock coverage.
  
  

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In short, Cin7 keeps your operations moving. Conjura makes sure it’s moving in the most profitable direction.

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Conjura + Inventory Planner: Add Marketing Intelligence to Your Replenishment

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Inventory Planner gives you a great view of what to reorder based on sales velocity and forecasted demand. But what it doesn’t show you is how much profit those products are actually making or how your marketing is impacting demand.

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That’s where Conjura comes in.

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How the integration works:

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• Conjura ingests your Inventory Planner data, including:
  
  
  
  • Forecasted stock requirements
    
    
  • Sell-through rates
    
    
  • Purchasing lead times
    
    
  • Replenishment recommendations
    
    

• Then enriches it with:
  
  
  
  • SKU-level marketing attribution (Google, Meta, TikTok)
    
    
  • Product performance metrics like views, conversion rate, and LTV
    
    
  • Daily profitability insights and growth recommendations
    
    

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Why brands love this combo:

• Replenish what performs: Prioritize SKUs with high margins, strong conversion, and repeat purchase behavior—not just past sales.
  
  
• Forecast with confidence: Back up your purchase orders with data on customer intent and campaign performance.
  
  
• Real-time optimization: Make agile decisions based on daily performance trends, not monthly reports.
  
  

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Conjura turns Inventory Planner from a smart inventory tool into a data-rich, profit-first decision engine.

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Book a Demo with Conjura

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At Conjura, we believe forecasting should do more than just predict, it should guide. Our AI-powered inventory forecasting helps you:

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• Predict future demand with SKU-level accuracy
  
  
• Understand which products are actually profitable
  
  
• Align marketing and merchandising decisions to maximize ROI
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👉 Book a demo today and take control of your inventory, your margins, and your growth.

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