Ecommerce inventory forecasting software: which tool tells you what to reorder

What does inventory forecasting software actually do?

It takes your past sales, your current stock and your supplier lead times (the days between ordering and receiving). Then it predicts how much you will sell and suggests what to buy. The better tools handle seasons, product launches and stock held in several places.

Two terms get mixed up. Inventory forecasting predicts stock needs for each product. Demand forecasting predicts what customers will want, and it is the input to the first one. In practice the tools below do both in one screen. If you want the maths behind it first, our inventory forecasting spreadsheet template shows the core formulas.

Can it be automated? Yes, mostly. The tool syncs sales on its own and flags what to buy. A person still approves the order, because only you know about a supplier delay or a planned promotion.

How to pick

1. Count your channels. Some tools are built around Shopify only. Others connect Amazon, Etsy, eBay and Walmart too.
2. Check how it is priced. Some charge by orders a year, some by your revenue, some by the amount of stock. The same business can pay very different amounts.
3. Decide if you need forecasting only or a full inventory system. A full system also runs purchase orders, warehouses and accounting links. It costs more and takes longer to set up.
4. Look at what forecasting costs. On some tools it is an extra plan or add-on.
5. Ask how long setup takes. Weeks matter if your peak season is close.

Quick comparison

Prices are in USD, taken from each vendor's own pricing page as of November 2026. Check the page before you buy, because plans change.

Tool	Starting price	Priced by	Channels	Best for
Prediko	$49 a month	Revenue band	Shopify focus, 150+ integrations	Shopify brands
Inventory Planner	Ask the vendor	Ask the vendor	Check the vendor's site	Larger multi-store brands
Sumtracker	$59 a month (sync only), $119 with forecasting	Orders a year	Shopify, Amazon, Etsy, eBay, Walmart	Small multichannel sellers
Finale	From $499 a month	Plan tier	40+ integrations	Growing multichannel sellers with warehouses
Cin7 Core	From $349 a month	Plan tier	2 to 6 integrations by plan	Wholesale plus ecommerce
Custom reorder alert	Fixed quote	One-off build	Whatever you use	Simple needs, odd rules

The tools, one by one

Prediko

Prediko is a Shopify inventory app that does demand planning, purchase orders and reports. Its plans start at $49 a month for stores with under $100,000 in sales over the last 12 months and rise with sales. It has a 14-day free trial, and every plan includes unlimited users, products and purchase orders, plus forecasting and buying alerts. Raw materials and bills of materials (the list of parts that make a product) are a separate add-on from $20 a month. It lists 150+ integrations with warehouse systems, 3PLs (third-party logistics companies that store and ship for you) and other platforms, so ask which of your channels it reads.

• Best for: A Shopify store that wants forecasting at a low entry price.

Inventory Planner

Inventory Planner is a forecasting and replenishment tool, now owned by Sage (the accounting and business software group). Its pricing page shows no figure; it says pricing is based on the volume of inventory you manage, with unlimited users, so you request a quote. I wrote about the Sage change and what to compare it with in Inventory Planner alternatives.

• Best for: Brands with several stores or warehouses who are happy to ask for a price.

Sumtracker

Sumtracker is an inventory sync tool that also forecasts. The Manage plan syncs stock across channels from $59 a month, or $50 on annual billing, for up to 2,500 orders a year. The Replenish plan adds purchase orders, stock transfers, 12-month forecasting and reorder suggestions from $119 a month ($100 annual). At 10,000 orders a year Replenish is $179 monthly or $150 annual. Both plans cover up to 10 warehouses and 10 channels, and it connects Shopify, Amazon FBA and FBM, Etsy, eBay and Walmart. It has a 14-day free trial.

• Best for: A small seller on several channels who wants forecasting without a big system.

Finale

Finale, from Descartes, is an inventory system for ecommerce and wholesale. It handles multiple warehouses, purchase orders and reports, and includes min-max reordering and sales velocity forecasting. Essentials starts at $499 a month and Growth at $799 a month. It lists 40+ sales channel integrations, including Shopify, Amazon and Walmart, and says go-live takes 2 to 6 weeks.

• Best for: A seller with warehouses and a need for one system of record.

Cin7 Core

Cin7 Core is an inventory and order management system for sellers and wholesalers. Standard is $349 a month for 5 users, 2 ecommerce integrations and 6,000 orders a year. Pro is $599 for 10 users, 4 integrations and 24,000 orders. Advanced is $1,199. Its AI forecasting, ForesightAI, is a paid add-on, so the real price is higher than the plan. Cin7 says its prices are for new customers and exclude taxes.

• Best for: Businesses that sell both wholesale and online and want accounting links.

A simple custom reorder alert

This is a small tool built on your own sales data. It reads your orders, applies your own reorder rules (including supplier minimums and bundles) and sends you an email or message when a product needs ordering. It does less than the tools above, but it only does what you need, and you own it.

• Best for: A seller whose needs are simple, or whose rules do not fit a standard tool.

What it really costs

A made-up example: a store with 10,000 orders a year across Shopify, Amazon and Etsy. Sumtracker Replenish would be about $150 a month billed annually. Finale would start at $499. Cin7 Standard is $349 and covers only 6,000 orders, so you would need Pro at $599, plus the forecasting add-on. Prediko depends on your revenue band. Check each page with your own numbers.

The cheapest tool is not always the cheapest answer. If two channels are not covered, you are back to pasting sales into a sheet. Our inventory management system guide compares the wider systems if forecasting is only one of your problems.

When simple reorder alerts beat a big tool

• You have under 100 products and know your suppliers well.
• Your rules are unusual: minimum order quantities, case packs or products made to order.
• You already have an inventory system and only miss the "tell me when to buy" part.
• You are paying for 90 percent of a tool you never open.

Questions to ask any vendor

• Which of my exact channels does it read, and how often does it update?
• Does it handle bundles, where one product sells as a pack of several?
• Can I set my own lead times and safety stock for each supplier?
• What happens to the price when my order volume doubles?
• Can I export my data and settings if I leave?

The answers to these matter more than the feature tour in a demo.

How I'd approach this

Start with your channels, not with the feature list. Write down where you sell and where your stock lives. Shortlist the two tools that connect to all of them, and use their free trials with real data for two weeks.

If you are on Shopify only, Prediko is the first one I would try. If you sell on Amazon and Etsy too, I would try Sumtracker first, because it is cheap and covers them. Move to Finale or Cin7 when you need warehouses, purchase orders and accounting in one place.

If none of them fit, or you only need a reorder alert, talk to me. A small build tied to your own data can be a better fit than a mid-range subscription. The wider choices for automating a small business are in our guide to business process automation.