Executive Summary
Inventory Planner by Sage is a planning product for merchants who want demand forecasts, replenishment recommendations, supplier requirements, and purchasing analysis. Its official forecasting materials describe configurable models, coverage settings, planning for new products, multiple locations, and open-to-buy. The vendor's pricing page says charges are based on inventory volume and asks merchants to request a quote. The Shopify listing says the app is free to install and that additional charges may apply. It does not publish the quote amount.
Supremo is a Shopify-native inventory operations app. Its public pricing page lists catalog-based plans and says every plan includes every feature. Current capabilities include reorder points with visible inputs, vendor and lead-time management, purchase orders, stocktakes, supplier-invoice CSV import with linked PO and invoice records, three-way matching, spreadsheet or CSV PO creation, and pick-list, packing, and fulfillment workflows.
Inventory Planner is the stronger starting point when advanced forecasting, multi-channel planning, or open-to-buy budgeting are central requirements. Supremo is the stronger starting point when a Shopify merchant prioritizes transparent reorder logic, published catalog pricing, and operational purchasing and fulfillment workflows. Neither recommendation applies to every merchant. Compare actual SKUs, suppliers, locations, integrations, and vendor quotes before switching.
Primary sources checked October 12, 2026: Inventory Planner pricing, Inventory Planner forecasting, Inventory Planner Shopify listing, and Supremo pricing.
Detailed Feature Analysis
Purchase orders
A purchase-order workflow turns a replenishment decision into a supplier order that can be tracked through delivery. Inventory Planner says buyers can create orders from buying recommendations, and its help center describes both replenishment-based and manual PO creation. Supremo supports creating and sending POs, plus PO spreadsheet or CSV creation as confirmed for the current product. Inventory Planner may suit teams that want forecast-led buying suggestions to generate orders; Supremo may suit teams that want an operational PO workflow closely tied to Shopify stock.
Sources checked October 12, 2026: Inventory Planner purchasing and Supremo purchase-to-fulfillment workflow.
Inventory forecasting
Inventory forecasting estimates future demand so a buyer can plan stock before current inventory runs out. Inventory Planner's official page describes configurable models, adjustments to changing sales patterns, and forecasting for new products using similar items. Supremo does not claim the same forecasting system. It calculates reorder points using sales velocity, lead time, and safety stock, keeping the inputs visible. Merchants with seasonal assortments or new-product planning needs should test Inventory Planner; teams who prefer auditable threshold math should test Supremo.
Sources checked October 12, 2026: Inventory Planner forecasting and Supremo reorder-point guide.
Supplier management
Supplier management stores the vendor details that affect cost, purchasing, and delivery timing. Inventory Planner describes managing suppliers and vendor requirements, including minimum order quantities and terms that can apply to purchase orders. Supremo manages vendor records and lead times in its Shopify inventory workflow. A business with complex vendor rules should compare how each product handles multiple suppliers, currencies, MOQs, and supplier-specific order constraints using its own data. Public pages do not establish every field or limit, so confirm those details in a product demonstration.
Sources checked October 12, 2026: Inventory Planner purchasing and Supremo features.
Inventory transfers
An inventory transfer moves stock between locations instead of asking a supplier for more units. Inventory Planner's official materials describe warehouse transfer recommendations based on forecasts across locations. Supremo supports inventory transfers within Shopify location workflows. For a retailer with stores and a warehouse, compare whether the proposed transfers account for demand at the destination, transfer lead time, and the Shopify locations that can participate. Do not assume the same automated recommendation logic from the fact that both products support multi-location inventory.
Sources checked October 12, 2026: Inventory Planner forecasting and Supremo features.
Receiving
Receiving is the process of checking an incoming supplier order and recording what arrived. Supremo's purchase-to-fulfillment material describes receiving as part of its operational workflow, and its three-way match capability was confirmed for the current product. Inventory Planner's cited public sources document purchase-order creation and replenishment planning, but do not fully establish receiving controls in the sources reviewed. Ask Inventory Planner to demonstrate partial receipts, discrepancies, and how received quantities update stock before relying on an assumed parity.
Sources checked October 12, 2026: Inventory Planner PO help and Supremo purchase-to-fulfillment workflow.
Reorder points
A reorder point is a stock threshold that signals when a new order should be considered. Supremo exposes reorder-point inputs based on sales velocity, supplier lead time, and a safety-stock buffer. Inventory Planner's replenishment recommendations are informed by configurable forecasts, stock coverage, supplier requirements, and location data. These are not identical methods. Merchants should compare recommendations for the same SKUs and lead-time assumptions, then ask whether staff can understand and adjust the logic behind the result.
Sources checked October 12, 2026: Inventory Planner forecasting and Supremo reorder-point guide.
Multi-location inventory
Multi-location inventory means tracking available and expected stock across more than one warehouse, store, or fulfillment site. Inventory Planner describes planning recommendations across multiple locations. Supremo tracks Shopify inventory by location and supports related transfers. The key buying question is not just whether an app lists multiple locations, but whether its planning workflow fits the merchant's locations, store structure, and transfer rules. Ask each vendor about location limits and whether the workflow supports one Shopify store, separate stores, or external warehouses.
Sources checked October 12, 2026: Inventory Planner forecasting and Supremo features.
Inventory reports
Inventory reports summarize stock, movement, purchasing, or exceptions so a merchant can make operational decisions. Inventory Planner describes advanced reporting and consolidated insights across retail performance. Supremo provides operational inventory reports with CSV export. Compare the exact questions each report can answer, its filters, date ranges, and export format rather than relying on a report-count claim. If finance or audit requires a specific historical view, ask each vendor to produce that report from sample data before moving systems.
Sources checked October 12, 2026: Inventory Planner Shopify integration and Supremo features.
Automation
Inventory automation reduces repeated manual work, but the word can refer to different levels of action. Inventory Planner advertises automated stock orders and reporting, as well as replenishment recommendations. Supremo automates parts of its Shopify-native inventory operations, while purchase orders and supplier invoice matching remain reviewable workflows. Before purchase, distinguish alerts, suggested quantities, draft orders, and orders sent without approval. Ask both vendors what can run automatically, which permissions are required, and how a staff member can review exceptions.
Sources checked October 12, 2026: Inventory Planner Shopify listing and Supremo workflow.
Analytics
Inventory analytics explain how stock and purchasing affect business performance. Inventory Planner emphasizes forecasting, buying, and retail performance insights, including budget-oriented planning. Supremo's reporting focuses on operational Shopify inventory, including stock movement, purchasing, and count variances. A planning or merchandising team may value forward-looking analysis; a lean Shopify operations team may value direct access to current stock and transaction workflows. Compare concrete questions such as expected sell-out date, excess stock cost, vendor performance, and count variance with each product's live reporting interface.
Sources checked October 12, 2026: Inventory Planner forecasting and Supremo features.
Integrations
Integrations connect inventory planning to sales channels, warehouse tools, and business systems. Inventory Planner describes integrations with sales channels, inventory-management systems, and ERPs, and its Shopify listing includes multi-channel capabilities. Supremo is Shopify-native and should not be treated as a multi-channel inventory synchronizer without specific supporting documentation. Merchants using Amazon, marketplaces, an ERP, or a 3PL should list each required system and verify the direction, timing, and fields of every connection before selecting a product.
Sources checked October 12, 2026: Inventory Planner pricing and integrations and Supremo features.
Ease of use
Ease of use depends on the job a team is trying to complete, not on a universal simplicity score. Inventory Planner is organized around forecasting, purchasing, reporting, and planning; the vendor offers demonstrations and describes support for setup. Supremo is designed around Shopify inventory operations such as reorder points, vendors, purchase orders, stocktakes, and fulfillment tasks. A small team may prefer a focused operational workflow, while a planning team may accept a deeper setup to get richer forecasts. Test a routine reorder and a stock exception with real users.
Sources checked October 12, 2026: Inventory Planner Shopify integration and Supremo features.
Support
Support includes onboarding, training, troubleshooting, and help resolving data or integration problems. Inventory Planner's public materials describe expert support and a demo-led sales process. The Supremo sources reviewed for this comparison do not state a comparable service-level commitment, so this page does not score response times or support quality. Ask both vendors about support hours, channels, onboarding scope, response targets, and whether setup help is included in the quoted or published price.
Sources checked October 12, 2026: Inventory Planner support overview and Supremo pricing page.
Pricing
Pricing should be compared against the merchant's actual inventory and catalog, not a guessed average. Inventory Planner's official page says pricing is based on inventory volume and asks buyers to request a quote; its Shopify listing says free to install and additional charges may apply. Supremo publicly lists Free, $19, $49, and $99 monthly tiers based on product and variant counts. Request a written Inventory Planner quote and compare billing currency, limits, implementation, integrations, and contract terms with the appropriate Supremo tier.
Sources checked October 12, 2026: Inventory Planner pricing and Supremo pricing.
Trial
A trial lets a merchant test a workflow before committing to recurring costs. The Inventory Planner pricing sources reviewed here do not state a trial duration; its listing says free to install with possible additional charges. Supremo lists a permanent Free plan and a 14-day trial for paid plans. A permanent free plan and a time-limited trial are different offers. Confirm the trial's feature limits, billing trigger, and cancellation rules directly with Inventory Planner before treating either path as risk-free.
Sources checked October 12, 2026: Inventory Planner Shopify listing and Supremo pricing.
Shopify integration
Shopify integration determines how an inventory app reads store data and supports work inside the merchant's admin. Inventory Planner has an official Shopify integration and Shopify App Store listing. Supremo is built as a Shopify-native inventory operations app. A merchant should verify which order, product, inventory, location, and vendor fields sync, how often updates run, and what permissions are required. Do not assume that installing either app replaces the need to test synchronization with the store's own products and locations.
Sources checked October 12, 2026: Inventory Planner Shopify integration and Supremo Shopify listing.
Migration
Migration is the controlled transfer of required data and operating procedures from one inventory system to another. No reviewed source establishes a complete, automatic transfer of Inventory Planner forecasts, saved settings, or historical purchase orders into Supremo. A merchant should ask Inventory Planner what can be exported, save the reports and open-order details it needs, and test Supremo's Shopify data import before relying on it. Keep a parallel record of open supplier commitments until the new workflow has been reconciled.
Sources checked October 12, 2026: Inventory Planner PO help and Supremo workflow.
Performance
Performance should be measured as the time and reliability required to complete the merchant's own work, not as an unsupported benchmark. The primary sources reviewed do not provide directly comparable load-time, forecast-latency, or uptime measurements for Inventory Planner and Supremo. This page therefore does not declare a speed winner. During a trial or demo, time a representative workflow, test the catalog size and locations, and ask both vendors for any service availability commitments that matter to the business.
Sources checked October 12, 2026: Inventory Planner pricing page and Supremo pricing page.
Scalability
Scalability is the ability to keep planning and operations usable as products, suppliers, channels, locations, and staff increase. Inventory Planner describes multi-channel and multi-location planning and prices according to inventory volume. Supremo publishes a Scale tier with unlimited products and variants and is focused on Shopify workflows. These statements describe different dimensions of scale; they do not prove that either app fits every enterprise requirement. Merchants should verify store count, user roles, integration limits, data retention, and support commitments for the next stage of growth.
Sources checked October 12, 2026: Inventory Planner pricing and Supremo pricing.
Warehouse workflows
Supremo supports Shopify customer-order pick lists, picking, packing, and fulfillment, with order and fulfillment status syncing back to Shopify. Inventory Planner's Shopify listing identifies barcode and scanner features, which may matter for warehouse work. These claims are not interchangeable: Supremo's confirmed order workflow is not a full WMS, and barcode-assisted order picking, wave picking, and bin routing are not established for Supremo in the reviewed materials. Supremo does not support barcode scanning for receiving or stocktakes. Merchants should ask both vendors to demonstrate the exact receiving, picking, packing, and shipping process they require.
Sources checked October 12, 2026: Inventory Planner Shopify listing and Supremo purchase-to-fulfillment workflow.
Final Recommendation
Inventory Planner is the better starting point for merchants whose core challenge is planning future demand across product types, channels, suppliers, and locations. Its official materials describe configurable forecasting, replenishment recommendations, open-to-buy, and integrations. Its pricing is quote-based on inventory volume in the source reviewed, so request a current quote and validate the workflow with your own data.
Supremo is the better starting point for Shopify merchants who want visible reorder-point logic, a published catalog-based price, and operational work in one Shopify-focused flow. Its current scope includes supplier POs, stocktakes, invoice CSV import and three-way matching, plus pick-list, packing, and fulfillment workflows. It is not presented here as a full WMS or a replacement for multi-channel demand planning.
Before choosing, test the same products, lead times, sales history, and supplier constraints in both systems. Compare forecast quality, staff effort, PO controls, receiving, reporting, integrations, and total ownership cost. Inventory Planner can be the stronger fit when planning depth matters most; Supremo can be the stronger fit when transparent Shopify operations and predictable published catalog pricing matter most.
Research note: Inventory Planner public sources were checked October 12, 2026. Vendor pages do not expose a publication or revision date for every feature and pricing statement, so the date checked is stated here. Recheck the official pages and obtain a current quote before purchase. Supremo price and workflow details were checked against the current first-party pages on the same date.