A Shopify app that uses the last 30 days of sales to warn merchants before a SKU runs out and tells them how many units to reorder and when.

Criterion by criterion

Why this score

1. Demand

   8/10

   Many merchant threads asking exactly this question

   Reddit threads ask how to never run out of stock with 100+ SKUs 10, how to actually track when to reorder 13, how to predict when to reorder popular items before they sell out 19, how to track low-stock items in a small store with many variants 30, and how to decide reorder quantity — by experience, spreadsheets, or Shopify reports 41. A Shopify Community thread asks for good inventory forecasting tools 2, and an r/ecommerce post asks for an app that reads sales trends and generates replenishment reports 20. Merchants also build spreadsheets with reorder point and suggested order quantity, which shows the job is being done by hand today 4234.

2. Room in the market

   4/10

   Hundreds of apps, several do exactly this

   Shopify's inventory optimization category lists 635 apps 16, and a search for "inventory management" returns 1000+ results 5. Apps that already combine low-stock alerts with reorder quantity from sales data include Bee Low Stock Alert & Forecast 17, PL Inventory & Low Stock Alert 38, and Sensible Inventory Forecasting 37. The one clear opening: Shopify delisted Stocky in February 2026 and shuts it down on August 31, 2026, leaving its users looking for a replacement 44368.

3. Proven willingness to pay

   7/10

   Paid plans exist from $4.99 to $199+

   Stockie charges $4.99/month for its Basic plan and $9.99/month for Advanced 3; a forecasting app cited in the Shopify Community charges $9.99 USD/month after a 15-day trial 2. Mipler's inventory planner runs $29.99 to $69.99/month 24 and Prediko advertises $49/month 5, with GMV-pegged tiers up to $199+ reported elsewhere 14. So merchants pay, but one Reddit thread notes inventory apps are among the most expensive app categories, which caps what small stores will accept 13.

4. Access to customers

   7/10

   App Store search plus Stocky migration demand

   The Shopify App Store is the channel, and buyer-intent listings already rank for "low stock alert" and "inventory forecasting" queries 173738. Stocky's shutdown on August 31, 2026 creates a named migration audience, and competitors are already publishing "Stocky alternative" and "Stocky migration" pages to capture it 84422. Reddit r/shopify and the Shopify Community are active venues where merchants ask for recommendations 13192.

5. Angle

   3/10

   30-day window is not a real edge

   The described features — alert before stockout, suggested reorder quantity, timing from sales history — are the exact description of existing apps 173738. A community reply describes an app where you set lead times, safety stock days, minimum order quantity and a sales window, which already covers a 30-day analysis 2. The idea as stated gives no angle that the listed apps lack, beyond possibly a lower price than the $29.99–$199 tier 2414.

Competition

8 products found on the web

Removed during verification: PL Inventory & Low Stock Alert : Gratuite (free) (price not found in the source) ; Inventory Planner by Sage : Installation gratuite. Des frais supplémentaires peuvent s'appliquer. (quote-based) (price not found in the source).

Demand

What shows the problem is real

• —r/shopify merchants repeatedly ask how to know when to reorder and how to avoid selling out of popular items.1013192541
• —A merchant with a few dozen products and many variants says it is easy to lose track of low inventory.30
• —A Shopify Community thread asks for good inventory forecasting tools and draws multiple vendor replies.2
• —Merchants use free Google Sheets and spreadsheet templates that compute average daily sales, reorder point and suggested order quantity.263442
• —Stocky's shutdown on August 31, 2026 pushes its users to look for a replacement, with a Reddit thread on Shopify's feedback request.153644
• —An r/ecommerce post with 90+ SKUs asks for an app that reads sales trends and generates replenishment reports.20

Risks

What could sink the idea

1. R1

   Feature already shipped by several apps

   Low-stock alert plus reorder quantity from sales history is the stated function of Bee, PL Inventory, and Sensible Inventory Forecasting 173837, inside a category of 635 apps 16.

2. R2

   Free tiers compress your price

   PL Inventory & Low Stock Alert is listed as free 1, Stockie has a free plan 3, and a community poster says their app just went permanently free 2.

3. R3

   Merchants already resent inventory app pricing

   A Reddit thread starts from the premise that inventory apps are one of the most expensive app store categories 13, so churn risk at paid tiers is real.

4. R4

   30 days of history may be too thin

   Merchants ask about trends, not just totals, and advise tracking trends rather than raw counts 33; multi-channel sellers warn that planning must include every channel drawing from the same stock or demand gets underestimated 2.

5. R5

   Missing adjacent workflows

   Community answers point out that forecasting alone does not cover multi-channel sync or purchase order creation, which merchants pair with other tools 228.

Limits

What the search couldn't establish

• No review counts or ratings from the sources for Bee, PL Inventory, or Sensible Inventory Forecasting, so their quality and install base are unknown.
• Inventory Planner's actual price is quote-based and not stated in the sources [S1, S4].
• No source gives the number of Shopify merchants using low-stock alert apps or the size of the Stocky user base left to migrate.
• Unclear whether small merchants will pay for alerts alone versus needing purchase order generation and multi-channel sync [S2].
• No source confirms US-specific demand versus English-speaking merchants generally.

Sources

Pages cited in this report

1. 1.Inventory Planner by Sage apps.shopify.com
2. 2.Good Inventory forecasting tools on Shopify? community.shopify.com
3. 3.How To Use a Low Stock Alert App To Monitor Inventory shopify.com
4. 4.Pricing inventory-planner.com
5. 5.10 Best Shopify Inventory Management Apps prediko.io
6. 8.Inventory Planner Pricing Compared (2026) forthcast.io
7. 10.How do you make sure to never run out of stock and how ... reddit.com
8. 13.How do you actually keep track of when to reorder inventory? reddit.com
9. 14.6 Best Inventory Planner Alternatives for Shopify (2026) p-h.solutions
10. 15.Shopify is asking for feedback on the discontinuation of Stocky and what ... reddit.com
11. 16.Best Inventory optimization Apps For 2026 apps.shopify.com
12. 17.Bee Low Stock Alert & Forecast apps.shopify.com
13. 18.Shopify Integration: Plan Smarter, Stock with Confidence inventory-planner.com
14. 19.How are you guys predicting Shopify inventory needs to ... reddit.com
15. 20.Inventory planning apps? : r/ecommerce reddit.com
16. 22.14 Best Shopify Inventory Management Apps for 2026 (US ... charleagency.com
17. 24.Inventory Management by Mipler - Prevent stockouts and ... apps.shopify.com
18. 25.automated reorder point? : r/shopify reddit.com
19. 26.How to build inventory forecasting report? community.shopify.com
20. 28.Stocky for Purchase Orders: Seeking Recommendations ... reddit.com
21. 30.How do you track low-stock or out-of-stock items in Shopify? reddit.com
22. 33.I cannot keep track of when my inventory will run out reddit.com
23. 34.Shopify Inventory Management: Spreadsheet vs App - Alertr getalertr.com
24. 36.Stocky Shopify App Sunsetting: What Retailers Need to ... inflowinventory.com
25. 37.Sensible Inventory Forecasting - Plan purchase orders, ... apps.shopify.com
26. 38.PL Inventory & Low Stock Alert apps.shopify.com
27. 41.How do you actually decide how much to reorder for your ... reddit.com
28. 42.Shopify Inventory Spreadsheet - Reorder Alerts & Stock ... ecommix.io
29. 44.The Best Shopify Inventory Management Apps in 2026 orderday.co