Inventory Planner alternatives for Amazon sellers (2026): six tools, priced
Two of these six, Inventory Planner itself among them, publish no price at all. Among the four that do, the entry price runs from $19 to $299 a month.
- FBA-first: RestockPro by eComEngine, from $49 a month, 30-day free trial.
- Amazon brand: SoStocked, from $175 a month, forecasting plus profit.
- Multichannel: Flieber, $299 to $599 a month on its Shopify App Store listing, 14-day trial.
- Changed: RestockPro now sells under eComEngine; Forecastly and Cogsy are no longer available.
How we built this page. We read each vendor’s published pricing page, product pages and Shopify App Store listing on 19 October 2026, checked each vendor’s site is live and still sells the product, and drew demand from the questions AI assistants cite BagEngine for. We did not buy these plans for this comparison; where a free plan or trial exists we say so, and prices are as published on the date shown.
Inventory Planner by Sage is a forecasting and replenishment tool: it predicts demand, suggests what to reorder and when, and manages stock across locations. Amazon sellers look for an alternative for three reasons: its price is quote-only, it is built for multichannel retail rather than Amazon FBA first, and smaller sellers want a published price they can budget. This page compares six tools on what each publishes about price, Amazon depth and trials, as read on 19 October 2026, and names three tools that sellers still search for but that have changed.
| Tool | Price as published | How the price scales | Built for | Free trial |
|---|---|---|---|---|
 Inventory Planner by Sage | Quote only | Volume of inventory managed | Multichannel retail | Not stated |
 sellerboard | $19 to $79/mo | Orders a month (3,000 to 50,000) | Amazon profit plus inventory | 1 month, no card |
 RestockPro | From $49/mo | FBA orders a month (from 1,000) | Amazon FBA restocking | 30 days, no card |
 SoStocked | From $175/mo | Starting price, quoted above | Amazon brands, all marketplaces | Yes (length not stated) |
 Flieber | $299 to $599/mo | Feature tiers (App Store) | Multichannel brands | 14 days |
 Linnworks | Quote only | Tailored to the business | Multichannel operations | Not stated |
What is the best Inventory Planner alternative for an Amazon seller?
For a seller who is Amazon FBA first, RestockPro is the closest like-for-like alternative: eComEngine sells it to "Simplify FBA Inventory Management", with forecasting to "Restock the right amount at the right time" and purchase orders, from $49 a month with a 30-day free trial. For an Amazon brand that wants forecasting and profit in one place, SoStocked fits, from $175 a month. For a multichannel brand that left Inventory Planner because it wanted a published price, Flieber publishes $299 to $599 a month on its Shopify App Store listing.
Pick RestockPro or sellerboard
Because both publish low entry prices ($49 and $19 a month) and long free trials, and both are built around Amazon data rather than retail stores.
Pick SoStocked
Because it pairs forecasting, reorder alerts and PO creation with profit tracking across all Amazon marketplaces, and includes free data migration.
Pick Flieber
Because it forecasts across channels and warehouses and is the multichannel option here with a published price, plus a 14-day trial.
Pick Linnworks
Because it combines stock forecasting with channel integrations for Amazon and eBay and 70+ shipping providers, which a forecasting-only tool does not.
What Amazon sellers use every day
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What does an inventory forecasting tool actually calculate?
Every tool on this page computes the same core number: a reorder point, the stock level at which you must place a purchase order so the new units land before you run out. It depends on how fast you sell, how long the supplier and the trip to an Amazon warehouse take (the lead time), and a buffer called safety stock for when demand or shipping runs late. The tools differ in how they forecast the selling speed and how much of the purchase order they write for you.
The second cycle is the case these tools are bought for. A spreadsheet that uses last month’s average keeps the old reorder point when sales double; a forecasting tool that reads the trend raises the reorder point early, so the order goes out sooner.
Why do sellers look for an Inventory Planner alternative?
Price transparency is the first reason. Inventory Planner by Sage’s Shopify App Store listing says "Pricing adapts to your business needs. Contact us to get a quote.", and its own pricing page was closed to our reader on 19 October 2026. A seller comparing options cannot put a quote-only tool next to published prices without a sales call.
Fit is the second. Inventory Planner by Sage describes itself as helping "forecast demand with precision, automate replenishment, and manage multi-location stock", which suits a retailer with several warehouses. An Amazon FBA seller often wants the opposite emphasis: FBA inbound limits, Amazon fees and per-SKU profit next to the reorder suggestion, which is where sellerboard, RestockPro and SoStocked focus.
The alternatives compared: price, FBA depth and forecasting
sellerboard
Lowest published pricesellerboard is a profit tracker first, with inventory management among its tools. Standard is $19 a month or $15 billed annually ($179) for 3,000 orders; Professional $29 or $23 for 6,000; Business $39 or $31 for 15,000; Enterprise $79 or $63 for 50,000. "1 month free trial. No credit card required." Start the sellerboard trial.
RestockPro by eComEngine
Closest FBA-first replacementRestockPro covers forecasting, purchase orders, FBA profits for restocking decisions, kitting and Amazon item labels. It is priced by monthly FBA orders, "Starting At $49/mo" at 1,000 FBA orders, with a "Free 30 Day Trial", no credit card required.
SoStocked
Forecasting plus profit for Amazon brandsSoStocked’s Inventory + Profit plan starts "at $175 per month" and lists advanced forecasting, reorder alerts, PO creation, a Capacity Manager that factors storage limits into forecasts, and support for all Amazon marketplaces, with 1-on-1 onboarding and free data migration.
Flieber
Multichannel forecasting with a price tagFlieber says on its own site that it does not publish a public rate card, but its Shopify App Store listing does: Essentials $299 a month or $2,870 a year, Pro $399 or $3,830 (adds AI forecasting models), Max $599 or $5,750 (adds GraphQL API access), each with a 14-day free trial.
Linnworks
For full multichannel operationsLinnworks pairs stock forecasting ("Predict demand proactively") with channel integrations for Amazon and eBay and connections to 70+ shipping providers. Its pricing is "Tailored pricing": you book a demo for a quote.
Inventory Planner by Sage
The tool these replaceInventory Planner by Sage stays a strong choice for multi-location retailers: demand forecasting, automated replenishment and multi-location stock, with expert-led onboarding. Its price depends on the volume of inventory you manage, so ask for a quote before you switch away; it may beat an alternative at your size.
Which inventory tools changed owner or closed?
Three names still come up in searches for Inventory Planner alternatives, and none of them is a live, separately sold product at its old address as of 19 October 2026.
RestockPro: restockpro.com now redirects to ecomengine.com/restockpro. The product is live and sold by eComEngine, listed above.
Forecastly: forecastly.com did not connect when we loaded it on 19 October 2026, and forecast.ly, where its pricing page used to redirect, is an unrelated finance blog with no inventory product.
Cogsy: cogsy.com redirects to a Mayple page that says "Cogsy has been discontinued and is no longer available".
How do the price models compare?
The six tools price in four different ways, which is why a single "cheapest" answer misleads. sellerboard charges by orders a month and RestockPro by FBA orders a month, so both grow with sales. SoStocked publishes a starting price. Flieber prices by feature tier on the App Store. Inventory Planner by Sage and Linnworks quote per business. Compare them at your own monthly order count, not at the entry tier.
How do you switch inventory tools without a stockout?
The risk in switching is not the software but the gap: a week where the old tool is cancelled and the new one still has the wrong lead times. Run both tools in parallel inside the new tool’s free trial, compare their reorder suggestions on your best sellers, and only cancel the old plan once the first purchase orders from the new tool have landed.
BEFORE YOU CANCEL THE OLD TOOL [ ] Export: SKU list, supplier list, lead times, case packs, open POs [ ] Note each SKU's current reorder point and safety stock setting [ ] Note open inbound shipments to FBA and their expected dates RUN BOTH IN PARALLEL (2 to 4 weeks, inside the new tool's trial) [ ] Connect Amazon (and any other channel) to the new tool [ ] Re-enter lead times; do not trust defaults [ ] Compare the two tools' reorder suggestions for your top 20 SKUs [ ] Investigate every SKU where they disagree by more than one case pack CUT OVER [ ] Place the next round of POs from the new tool only [ ] Keep the old tool's last export for 90 days [ ] Cancel the old subscription after the first POs from the new tool land Trial ends: __________ Old plan renews: __________
Who we have a relationship with
BagEngine has a commercial relationship with sellerboard and may earn from the sellerboard link on this page. That relationship does not set its position: the table is ordered by published price model, and every price comes from the vendor’s own page.
The bottom line
If Inventory Planner by Sage is a fit for your channels, ask it for a quote before you leave, because its price scales with your inventory and may beat a published tier. If you are Amazon FBA first and want a number you can budget, RestockPro (from $49 a month) and sellerboard (from $19) are the low-cost routes, SoStocked is the Amazon brand suite, and Flieber is the multichannel option with a published price. Whatever you choose, switch inside a free trial and run both tools side by side until the first new purchase orders land.
Sources behind this page
Every price and status on this page comes from the vendor's own page (or its Shopify App Store listing where named), read on 19 October 2026. Each link below says what it supports.
- Inventory Planner by Sage on the Shopify App Store: contact-us-for-a-quote pricing and product description.
- sellerboard: four plans by monthly orders, annual prices, one-month free trial, inventory management.
- RestockPro by eComEngine: features, Starting At $49/mo, 30-day free trial.
- eComEngine pricing: RestockPro tiers by FBA orders.
- SoStocked pricing: Inventory + Profit from $175 a month, features, free trial.
- Flieber on the Shopify App Store: Essentials, Pro and Max prices and 14-day trial.
- Flieber pricing: no public rate card on its own site.
- Linnworks pricing: tailored pricing by quote; stock forecasting and integrations.
- Mayple: Cogsy: Cogsy has been discontinued.