Inventory Planner is the dedicated demand-forecasting tool for Shopify brands carrying real catalogue depth. This guide covers how its forecasting works and where it fits.
How the forecasting works
Inventory Planner’s core is seasonality-aware demand forecasting: it models historical sales to predict future demand per SKU, then drives lead-time-aware reorder points so you order the right quantity at the right time. On top of that sit Open-to-Buy (OTB) reports, 200+ metrics with SKU-level reporting, container-aware purchase-order optimization, and multi-warehouse / multi-channel forecasting. It is Built-for-Shopify (Inventory Planner Essentials launched exclusively on the Shopify App Store in July 2024 under Sage ownership) and integrates with Google Analytics for demand signals.
What you get
The practical output is automated purchase orders, overstock and forecasted-lost-revenue reports, and scheduled email/Slack reporting — the planning layer that prevents both stock-outs (lost sales) and overstock (tied-up cash). For brands running 500+ SKUs across multiple warehouses, that forecasting depth is the difference between guessing and planning.
The honest caveats
Three things to weigh. Pricing rose sharply after the Sage acquisition — verify your renewal quote against the original contract. A Shopify sync issue was reported in late 2025 — confirm sync stability during your trial before committing. And pricing is custom-quoted (no published Starter tier; third-party benchmarks cite a ~$245/mo floor, with brands reporting $10K+ annual cost), so evaluation requires direct vendor contact. See the Inventory Planner pricing breakdown.
Who this is for
Inventory Planner fits mid-market to enterprise brands with multi-warehouse, multi-channel complexity and hundreds-to-thousands of SKUs. It is the realistic dedicated pick in our best inventory roundup — which also makes the honest case that stores under ~100 SKUs are usually better served by Shopify’s built-in inventory tools plus a low-stock rule.