Reactive — Demand Planning Software for Fashion Brands That Outgrew Spreadsheets

Demand planning software for $5M–$100M apparel brands that outgrew spreadsheets but can’t justify Toolio. Replaces spreadsheet guesswork with transparent math. Built for planners, not analysts.

Key Features

• Style-and-Size Demand Outlook — A recency-weighted sales rate on seasonal curves fitted to your sales once there is enough history, up to 52 weeks ahead. Stockout and broken-size weeks are rebuilt to what they would have sold, so the planning horizon reflects real demand, not noise.
• Reorder Recommendations — Critical and Soon signals calibrated to your lead time and safety stock. Carton packs and vendor minimums applied; a minimum split across colours is flagged, not padded. Filed nightly in the alert inbox.
• Weeks of Cover — Live inventory runway, seasonality-adjusted. Color-coded red, yellow, green, blue so you see risk at a glance.
• Demand Quality Filters — Detects trailing demand dropoffs, promo-driven spikes and size breakage; a spike at full price counts, because it is real demand. Every threshold is visible and adjustable.
• Markdown Tiers & Price Simulator — Log-log regression fits price sensitivity per style, sub-category and category. Markdowns step down your own price tiers, shown when a step pays for itself or the style is over its overstock line; model any other depth to see velocity lift, GM impact and cover.
• Promo Planner — Start from your excess stock and get a recommended discount for each style from its weeks of cover. Edit any promo price, and see the extra units, the post-promo demand dip and the weeks of cover after before you commit.
• Size-Level PO Exports — ISSR builds size curves from your own sales data. PO quantities broken by size with largest-remainder rounding.
• Open-to-Buy Budget — Set a budget for each month stock lands. A budget bar on the cart warns as it nears or passes a month's budget.
• Sell-Through Tracking — Set a target sell-through percentage by week. Styles that miss the mark get flagged automatically.
• Inventory Turns & GMROI — Measures how fast inventory converts to revenue and return on inventory investment.
• Cannibalization Alerts — When a new launch pulls sales from existing styles, Reactive flags the velocity drop.
• Markdown-Only Demand Detection — Flags styles that only sell at a discount before you reorder at a margin that doesn't exist.

How It Works

Install from the Shopify App Store and Reactive syncs your order, product, and inventory history automatically, then re-syncs every night — no CSV required. Reactive builds a demand outlook for every style and size, flags reorder needs, and generates size-level purchase orders. Older sales and stock history can be imported, and open purchase orders uploaded, linked or pushed from an ERP, in Settings.

Pricing

Growth plan: $99/month, billed through the Shopify App Store. 30-day free trial. No contracts, cancel anytime.

Who Is It For?

Reactive is built for $5M–$100M apparel brands with a dedicated planner or buyer who currently runs the assortment in Excel. Replaces spreadsheet guesswork with transparent math — at a fraction of the cost of tools like Anaplan or Toolio. Not a fit for brands under $3M revenue, non-apparel categories, or teams looking for a full ERP replacement.