Best Shopify Inventory Forecasting Apps (2026)

Disclosure first: we make StockCue, one of the apps below. Everything here about another vendor's app was read on that vendor's own Shopify App Store listing or pricing page on 6 September 2026. We have not run these apps side by side against the same catalogue, so this post does not claim to rank forecast accuracy. What it can do is separate what these products actually are, price them honestly with a date attached, and say who each one is for.

The apps are ordered by review count, largest first. That puts ours last, because it has none.

Forecasting, planning or reordering?

Three search terms, one market. "Inventory forecasting app", "inventory planning app" and "reorder app" mostly return the same products, and the products themselves are the reason: they use all three words to describe themselves.

From the listings, read 6 September 2026: Assisty says it forecasts demand, calculates reorder points, automates purchase orders and plans replenishment. Prediko calls itself "AI inventory forecasting, demand planning and purchase order management". Fabrikatör leads with "Plan & restock smarter with AI forecasting and PO automation". Sensible Inventory Forecasting says "Avoid stockouts & purchase efficiently using inventory forecasting". Inventory Planner by Sage sells "smart inventory planning". Five vendors, five self-descriptions, and the same three verbs shuffled.

So do not shop by the label. The apps that calculate a reorder point are the apps that forecast demand, because you cannot do the first without doing something like the second. What separates them is the four things below, none of which appear in the category name.

What actually separates them

How much history it reads. A tool that looks at the last thirty days cannot see last December. If your catalogue has any seasonal shape at all, the length of the history window is the difference between a forecast and an extrapolation of last month.

Whether it handles seasonality and outliers. A single viral week, a sold-out promotion, or a supplier-caused zero all sit in your sales data as if they were normal demand. Ask what the tool does with them. Our guide to forecasting methods for Shopify covers why one method cannot fit a whole catalogue.

Whether it outputs a quantity or a flag. This is the sharpest line in the category and the one most worth checking on a trial. "This SKU is low" is an alert. "Order 240 units, arriving before you run out at current velocity" is a plan. Both are useful; only one of them saves you the arithmetic.

How it charges. Flat monthly, tiered by SKU count, quoted on inventory volume, or metered on usage. These are genuinely different bets, and the cheapest entry price is often not the cheapest tool at your size.

The comparison

Prices read on each vendor's Shopify App Store listing or pricing page on 6 September 2026. They will drift; check before you install.

The one number a vendor cannot manufacture is how many merchants have already used the thing and said so in public. Here is that number for every app above, read on the Shopify App Store on 6 September 2026.

The apps

Assisty

356 reviews on 6 September 2026, the largest review base of any app checked here, alongside a free plan and a $19/mo cheapest paid tier. The listing covers demand forecasting, reorder points, automated purchase orders and replenishment planning across every location and SKU.

Right for: a merchant who wants reporting depth, multi-location handling and a free entry point, and who values a long public track record. On price and proof together this is the strongest direct competitor in the small-to-mid segment, and there is no honest way to write this post without saying so. Less right for: someone who wants a small, opinionated tool; reviewers mention a learning curve on complex setups and some Stocky feature gaps at migration.

Prediko

246 reviews, 96% of them five-star. Starter $49/mo, Scale-up $119, Growth $199, Enterprise quoted, read 6 September 2026, with unlimited users, SKUs and alerts on every paid tier. The positioning is demand planning rather than forecasting alone: spreading revenue targets across a forward horizon instead of only projecting from history.

Right for: a growing DTC brand that plans to a number rather than reacting to one, and any store whose catalogue would climb through a tiered competitor's pricing, since there is no SKU ceiling. Reviewers migrating from Stocky mention the vendor importing their suppliers for them. Less right for: a store whose whole question is when to reorder 150 SKUs, which is the case the alternatives to Prediko are written around. No recurring complaint theme was identifiable in the reviews read, and we are not going to invent one.

Inventory Planner by Sage

151 reviews. Listed as free to install, with external charges billed by the vendor separately from your Shopify invoice. There is no published price: as of 6 September 2026 the vendor's pricing page carried no dollar figures at all, said pricing is based on the volume of inventory you manage, included unlimited users, and put a "request pricing" form where the plans would be. If you see a specific monthly figure quoted for this product anywhere, including in older posts on this site, treat it as unsourced.

Right for: established multi-channel or multi-warehouse retailers with enough inventory volume to justify a quoted contract, and teams with a lot of people needing logins. It is the most mature product in this set and a small app should not pretend to match its depth. Less right for: small stores, and that is not our editorialising. Its own reviews return to it: a price increase one reviewer described as threefold after the Sage acquisition, rigid refund handling, and a merchant told their company was too small for the service. Individual reviews rather than a survey, but they repeat.

Fabrikatör

112 reviews, 96% five-star. SEED $99/mo, SCALE-UP $149, GROWTH $199, each including 50 backorders then charging $0.75 per backorder, with an enterprise tier quoted. Read 6 September 2026. The usage fee is the tell: this product treats backorders and pre-orders as part of replenishment rather than an edge case.

Right for: brands that genuinely sell on backorder or pre-order and want it tied into what they buy next, and teams who want purchase order automation rather than paperwork. Reviewers describe ordering time dropping from hours to minutes. Less right for: a store that never takes backorders and would be paying a backorder-shaped price for it, or any store where $99/mo is a large slice of monthly profit.

Sensible Inventory Forecasting

11 reviews, one plan at $29/mo with a 30-day trial, read 6 September 2026. The vendor's pricing page is reported to offer unlimited products with no tiers, but we did not read it directly, so treat that detail as secondhand.

Right for: a small store whose only real question is what to reorder and how much, and which would rather pay one flat price than watch a SKU counter. Against every SKU-tiered app in the table above, ours included, a flat price with no ceiling is a real advantage for a large but low-value catalogue. Less right for: multi-location depth or a deep purchase order workflow. Eleven reviews is also very little to lean on if social proof is part of your decision.

StockCue (ours)

No rating and no reviews on 6 September 2026, against 356 for Assisty and 246 for Prediko. That is the honest headline and you should weigh it. Forecasting with seasonal adjustment runs on every plan including Free, which covers 50 SKUs, reading 24 months of order history. Paid tiers are priced by SKU count rather than flat: 500, then 2,000, then unlimited. Purchase orders, receiving and stock counts start at Starter, so the free plan is a forecasting tool and not a purchasing one, and transfers are Scale-only.

Two apps not on the list, and why

Cogsy. Readers ask about it, so here is what we observed on 6 September 2026 and nothing more. The vendor's domain redirects to a Mayple page stating that Cogsy has been discontinued and is no longer available. An App Store listing was still rendering the same day, showing a $199/mo plan and no discontinuation notice. No shutdown date is published anywhere we could find. We are not recommending it and we are not telling you it is buyable.

Alert-only apps. Stockbot Low Stock Alert had 4.9 stars from 40 reviews on 6 September 2026, with a free plan, a $9/mo alerts plan, and a $25/mo tier adding demand forecasting and replenishment recommendations. That last tier is the cheapest forecasting named in this post. LSA Low Stock Alert, 4.5 stars from 32 reviews at $5.99/mo the same day, is alerting only. And before paying for either: Shopify Flow is free on the Basic, Grow, Advanced and Plus plans, and Shopify's own documentation names it as one of the two ways to get low stock notifications. All of that belongs to the alerting category, which the app category map lays out in full.

Where a spreadsheet still wins

A single-location store with a few dozen SKUs and demand that looks the same in March as in October does not need any of the six. Shopify's own inventory reports give you a days-of-inventory-remaining figure and an ABC grading by revenue, and native purchase orders cover the buying paperwork for free. The arithmetic in our forecasting guide can be done by hand on top of that.

The spreadsheet's failure mode is that it does not fire. When a SKU's sales rate doubles, nothing happens. You find out at the stockout, weeks after the signal first appeared in the data, by which point the reorder is late by the length of your lead time. That is the real trigger for buying software, not a SKU threshold, and the spreadsheet versus software comparison works through where the line falls. If you came here from Stocky instead, the Stocky alternatives comparison is scoped to that migration.

FAQ

What's the difference between an inventory forecasting app and an inventory planning app?

Usually nothing but the word. The same apps describe themselves with both terms and with "reorder" as well: read six App Store listings in this category and you will find forecasting, planning, replenishment and purchase order management claimed by most of them. The distinction that does matter is whether a tool projects demand forward from your sales history or simply reports what already happened, and that is not something the category name tells you.

Does Shopify forecast inventory natively?

No. Shopify's inventory reports include an ABC product grading and a days-of-inventory-remaining report, but neither projects demand forward and there is no reorder point in the admin. One thing to watch: a Shopify help page titled "Demand forecasting for Purchase Orders" documents Stocky's forecasting, not the Shopify admin's, and Stocky was retired on 31 August 2026. The URL contains the word stocky, which is the giveaway.

How much sales history does a forecasting app need?

Enough to cover one full cycle of whatever repeats in your demand. If your sales have a Christmas shape, that means at least a full year, and preferably two so the app can tell a real season from a one-off. Apps differ in how far back they read, so it is a fair question to ask a vendor before installing: StockCue reads 24 months. A brand-new product has no cycle to read, and no app can invent one.

Is a forecasting app worth it under 100 SKUs?

It depends far more on how variable your demand is than on the SKU count. A hundred SKUs with steady, year-round sales can be reordered from a spreadsheet indefinitely. A hundred SKUs with a seasonal peak and a six-week lead time will punish manual recalculation, because the number that should have triggered a reorder appears in the data weeks before anyone looks at it. Free tiers exist in this category, which makes the question cheap to answer empirically.