Best Amazon Restock Software (2026): Inventory Forecasting and Stockout Alerts Compared

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions.

The best Amazon restock software in 2026 is RestockPro (from $49/month) if you want a dedicated FBA reorder engine at the low end, SoStocked (now sold by SPS Commerce, inventory forecasting from $250/month) if seasonality and long lead times are your real problem, and Sellerboard ($19–$79/month) if you mainly need a stock-shortage warning attached to a profit dashboard you already want. All prices below were checked against vendor pages on 2026-07-25; where a vendor no longer publishes a number, that is stated instead of guessed.

This guide covers one narrow job: deciding when to reorder and how much, and getting warned before you run dry. That is not multichannel inventory management — syncing stock levels across Amazon, eBay, Shopify and a warehouse is a different problem with different vendors, and mixing the two is how sellers end up paying enterprise prices for a reorder-date calculation. For the profit numbers these tools quote back at you, see best Amazon profit analytics tools; for the operational sequence around receiving and shipping, AMZFinder’s inventory operations workflow covers the surrounding steps.

Quick Pick

• Dedicated FBA reorder engine, cheapest entry: RestockPro, $49/mo for 1,000 FBA orders, 21-day trial, no card.
• Seasonal or long-lead-time products: SoStocked (SPS Commerce), inventory forecasting starts at $250/mo; demo-gated.
• Cheapest useful stockout warning: Sellerboard, $19/mo, 1-month free trial — a shortage estimate inside a profit tool, not a planning system.
• Already paying for Helium 10 Diamond: use the bundled Inventory Management before you buy anything else.
• Selling under roughly 200 units a month: Amazon’s own restock recommendations plus a spreadsheet. Genuinely. (That cutoff is our editorial rule of thumb, not a vendor threshold.)
• Prep-center or arbitrage workflow: InventoryLab, but only via Threecolts Seller 365 Pro at $199/mo — restock insights are excluded from the lower tiers.

What Restock Software Actually Does

Strip the marketing away and every tool in this category computes the same four things:

1. Sales velocity — units per day, usually a weighted average over a trailing window.
2. Days of supply — units on hand (plus inbound) divided by that velocity.
3. Reorder point — the day-of-supply threshold at which you must place a purchase order, given your supplier lead time and shipping time.
4. Reorder quantity — how many units to buy so you land back at your target coverage without overshooting into storage fees.

Everything else — purchase orders, kitting, supplier records, label printing — is scaffolding around those four numbers. So compare tools on the inputs they let you control and the freshness of the data they run on. Two tools with identical dashboards produce reorder dates weeks apart if one takes per-SKU lead time and the other assumes a global default.

Getting this wrong costs money in both directions. Running out costs rank and sales. Running thin costs cash directly: eComEngine’s RestockPro FAQ states that Amazon’s low-inventory-level fee, introduced in 2024, applies when sellers are “unable to maintain more than 28 days of supply based on historical days of supply calculated by Amazon” (vendor page, checked 2026-07-25). Overstocking triggers aging-inventory charges at the other end. See Amazon’s 2026 fee changes for the current cost stack and FBA fees and profit for how these charges hit unit economics.

Start Here: What Amazon Already Gives You Free

Amazon’s Restock recommendation feature for Fulfilled by Merchant listings “uses a demand forecasting model to help you maintain healthy inventory levels,” providing “[s]uggested restock quantities based on current inventory and projected two-week demand across all locations,” estimated days of supply, and “[f]orecasted eight-week demand trends using artificial intelligence models.” Eligibility requires active sales in the last three months and days of supply under 14 (Amazon Seller Forums announcement, updated March 19, 2025, checked 2026-07-25). That announcement covers Fulfilled by Merchant listings specifically; FBA restock recommendations sit on their own Restock Inventory page.

Two structural limits are what paid software sells against. Amazon’s forecast horizon is short — two weeks for the quantity, eight for the trend — which is useless when supplier lead time runs 90 days. And Amazon does not know your costs, MOQs, or container schedule. eComEngine puts the second point bluntly on its own product page: “Amazon’s idea of your ideal inventory situation and yours can be different. Many sellers prefer to protect their supplier information, costs, and margins from Amazon.”

As a rough cutoff — ours, not a vendor’s — if your lead time is under three weeks and you have fewer than 30 SKUs, the free tools plus a spreadsheet will hold. Buy software when lead time exceeds forecast horizon, or when SKU count exceeds what you can eyeball weekly.

The Field at a Glance

The Two Dimensions That Actually Decide It

Feature grids all look the same. These two are where sellers get burned.

Forecast accuracy

A forecast is a claim about the future built on two inputs you supply: demand history and lead time. Vendors control neither well, and reviewers notice. A Jungle Scout customer wrote on Trustpilot (2023-05-11, 1 star): “This site crashes every single day. On top of that the Inventory Manager doesn’t work correctly as advertised. I’m constantly running out of stock.” A Sellerboard customer wrote (Trustpilot, 2025-11-24, 2 stars): “I have been using the tool for 2 years and always dealt with the bugs. But the last month it has become usable with constantly inaccurately showing our costs.”

The most instructive complaint is the one where a seller ran two tools side by side. A ManageByStats customer wrote (Trustpilot, 2022-04-13, 2 stars): “I used manage by stats for years, which was ok to start with, but after comparing it to sellerboard recently, I realized that the profit margin stats were wildly out compared to sellerboard and very misleading, I couldn’t believe it, even though i had checked all my settings on both platforms.” [sic] Two vendors reading the same Amazon account disagreed materially, and the seller only found out by running a comparison. That is the test, not the feature grid.

The lesson is not “these tools are bad.” It is that a restock forecast inherits the error of its demand estimate, and demand estimates are noisier than the dashboard implies — the same problem covered in how accurate Amazon sales estimators really are. Before trusting a reorder date, backtest it: pick three SKUs, find what the tool would have told you to order 90 days ago, compare against what you actually sold.

Data freshness

A reorder point computed on yesterday’s numbers is a different number from one computed on last week’s. An InventoryLab customer wrote (Trustpilot, 2024-02-07, 1 star): “The software doesn’t update in real-time; I often log in and find it lagging behind on sales data. While this might be manageable, the fact that it doesn’t account for advertising PPC makes it practically useless for my needs.”

Ask any vendor two questions before signing: how often does it pull from Amazon, and does it count inbound and reserved units in “on hand”? A tool that ignores in-transit inventory will tell you to reorder something already on a boat.

The Tools, One by One

RestockPro — the dedicated reorder engine

Pricing (checked 2026-07-25, ecomengine.com): Starter $49/mo (1,000 FBA orders), Pro $79/mo (2,500), Premium $119/mo (7,500), Ultimate $199/mo (20,000), with Enterprise tiers continuing up to 300,000 FBA orders per month. Every plan is listed at a discount off a higher struck-through list price. Free 21-day trial, no credit card. eComEngine states “All features are available on every plan level” with “no hidden costs or charges based on a percentage of sales.”

RestockPro is the most straightforward answer to the literal search. It describes itself as analyzing “hundreds of data points to provide intelligent FBA restock suggestions,” and it surfaces Amazon’s Minimum Inventory Level and historical days of supply alongside its own recommendation — the fee threshold and your reorder point on one screen. Purchase orders, supplier records, kitting, and item labels are included rather than upsold.

The limit worth pricing out: the tier is set by monthly FBA order count, not SKU count or revenue. A seller moving 20,000 low-priced units sits in the $199 tier while a seller doing the same revenue on 2,000 high-priced units pays $79. The four tiers above are the named plan levels; the volume selector on that page actually steps through seventeen brackets from 1,000 to 300,000 FBA orders per month, with prices in between, so price your own bracket rather than the nearest named plan. Do that arithmetic before the trial ends. AMZFinder maintains a RestockPro discount and coupon page; its figures predate this guide, so confirm any code is still live at checkout rather than treating it as current pricing.

SoStocked — forecasting depth, now under SPS Commerce

Pricing (checked 2026-07-25): ProfitFlow $97/month; ProfitFlow + Inventory “Starting at $250 per month.” The Inventory tier is behind a “Book a Demo” button rather than self-serve checkout.

The important fact first: sostocked.com now redirects to spscommerce.com/products/sostocked/ (checked 2026-07-25). SoStocked is sold by SPS Commerce, with signup still routed through login.carbon6.io, and the packaging changed with the move. Any comparison quoting a standalone SoStocked subscription price predates the current listing — check the SPS page, not a review from last year.

The vendor page claims the deepest forecast horizon in this roundup: demand forecasting “up to 12 months ahead, factoring in seasonality, trends, and promotions,” with reorder alerts, Amazon capacity-limit awareness, and tracking across FBA, AWD, and Multi-Channel Fulfillment. That horizon is the reason to consider it — on a 90-to-120-day import lead time, a two-week native forecast is not a planning tool and a 12-month one might be.

Reported drawbacks, paraphrased from review aggregators rather than quoted: bulk purchase-order exports are awkward, it cannot create FBA shipments automatically, the framework was not designed for retail arbitrage or complex bundling, and there is a learning curve offset by strong onboarding calls. AMZFinder’s SoStocked review goes deeper on the feature set.

Sellerboard — the cheap stockout warning

Pricing (checked 2026-07-25, sellerboard.com): Standard $19/mo ($15 annual, $179/yr, up to 3,000 orders), Professional $29/mo ($23 annual), Business $39/mo ($31 annual), Enterprise $79/mo ($63 annual, up to 50,000 orders). One month free trial, no credit card.

Sellerboard’s own site describes the inventory module as letting you “get notified about stock shortage estimates in advance, distribute your Cost of Goods by batch and plan your Purchase Orders in one easy-to-use dashboard.” That is the scope exactly: a warning plus a simple PO log, riding on a profit dashboard. It does not pretend to be a demand-planning system, and at $19/month it does not need to.

The recurring complaint pattern here is accuracy rather than features, as the 2025-11-24 review above illustrates. If Sellerboard’s alert is the only forecasting you have, verify its velocity numbers against Seller Central for a month before trusting a purchase order to it.

Helium 10 Inventory Management — free if you already pay

Pricing (helium10.com/pricing checked 2026-07-20; feature tier re-confirmed on helium10.com 2026-07-25): Inventory Management is included in the Diamond plan at $359/month, or $279/month billed yearly. It is not in Platinum ($129/month, $99/month yearly). Helium 10 does have a free tier, but this tool is not on it.

The tool applies forecasting models to your sales and inventory data to recommend when to order or transfer products, with custom presets for lead times, reorder frequency, and shipment speeds. That input control is the part that matters, and it is roughly on par with the dedicated tools.

The recommendation is conditional, and it should be. Do not buy Diamond for this. At $279/month annualized it costs more than RestockPro’s top self-serve tier and more than SoStocked’s inventory entry price. But if you are already on Diamond for Profits and the research tools, you are paying for restock forecasting whether or not you open it — check it before subscribing to anything else. (Helium 10)

SellerPulse — alerting, not planning

Pricing (checked 2026-07-25, ecomengine.com): from $89/mo, tiered by monthly orders from 2,000 to 100,000+, with a 30-day free trial. The pricing page lists Inventory Planning alongside a Buy Box report, returns analysis, FBA fee insights and alerts, and an SKU Economics Report.

SellerPulse sits beside RestockPro in the same vendor’s lineup, and the split is deliberate: it is an operational alerting product with inventory planning attached, while RestockPro is the reordering workhorse. If your pain is “tell me when something is wrong” rather than “tell me how many units to buy,” SellerPulse fits — but it starts higher than RestockPro at low volume.

InventoryLab — no longer standalone

Pricing (checked 2026-07-25, threecolts.com/seller-365/inventorylab — inventorylab.com now redirects there): InventoryLab is now bundled — “InventoryLab is included in every Seller 365 plan.” Seller 365 is $69/mo, Seller 365 Teams $129/mo ($119 annual), Seller 365 Pro $199/mo ($183 annual). 14-day free trial, structured as “7 days instantly plus 7 more when you connect your Amazon Seller Pro or Walmart Seller account.”

The detail that decides it: the feature comparison lists “Restock insights — Know when and how much inventory to reorder based on sales trends and stock levels” on Seller 365 Pro only; the two lower tiers show a dash. So the effective price of InventoryLab restock forecasting is $199/month — four times RestockPro’s entry tier. InventoryLab remains strong for the sourcing-and-prep workflow it was built for, and the bundle may pay for itself if you need that workflow. As a restock tool alone, it is expensive.

ManageByStats — not verifiable right now

As of 2026-07-25, managebystats.com redirects to a Carbon6 login screen and no public pricing page is reachable. Products get folded into parent-company portals routinely, but it does mean a buyer cannot compare price or feature scope without contacting sales. Combined with the side-by-side accuracy complaint quoted earlier, treat it as “get a quote and test against Seller Central,” not a shortlist entry.

Linnworks — the boundary case

Linnworks is here only to mark the edge of the category. Its pricing is custom-quote with no public list price, billed by monthly order volume, and Forecasting is a separately-priced add-on module alongside Listing, WMS, and Analytics, with a one-time onboarding fee on top (official pricing page checked 2026-07-20).

Linnworks is a multichannel operations platform. If your problem is “one SKU sells on Amazon, eBay, and Shopify and the counts drift apart,” that is the right category — and not the one this guide covers. If your problem is “when do I place the next PO,” buying Linnworks to get a reorder date is buying a warehouse to store a bicycle.

Its review record is worth reading before either decision. A customer wrote on Trustpilot (2026-03-12, 2 stars): “Atrocious support, but decent product… These are processes that have been stable for years, and for no reason, stop working or have delays for some time.” Pricing complaints recur across years, with multiple reviewers reporting multi-hundred-percent renewal increases and difficulty cancelling.

Tools That Show Up in This Search but Don’t Belong

Prediko. It ranks for inventory forecasting and it is a capable product — $49/month under $100k GMV, tiered by gross merchandise value, 14-day trial, with a $20/month raw-materials-and-BOM add-on. But it is built on Shopify — stores, POS and B2B — plus 70+ WMS and 3PL connections, and on its integrations page the Amazon entry carries a coming-soon tag reading “Coming soon — Click to join waitlist.”, above an email waitlist headed “Coming soon. Real-time Amazon inventory management with Prediko” (checked 2026-07-25). Worth a look for a Shopify-first brand with Amazon secondary, or worth a waitlist signup. If Amazon is your business, it is not solving your problem.

Jungle Scout. Jungle Scout historically shipped an Inventory Manager — the 2023 review quoted above refers to it. As of 2026-07-25, junglescout.com/features/inventory-manager/ redirects to the Catalyst product page, and neither that page nor the pricing page lists inventory or restock management. Treat Jungle Scout as a research suite and confirm current scope with sales before counting on it for reordering.

Your Forecast Is Only as Good as Its Inputs

Two input problems break restock math regardless of which tool you buy.

Phantom units. If Amazon lost or damaged inventory and never reimbursed you, your on-hand count is wrong in the tool’s favor — it thinks you have coverage you do not have, and the reorder date slips past the point of no return. The options and commission structures are compared in best Amazon FBA reimbursement services. To size the gap without paying a commission on recoveries, a flat-fee audit tool such as ReimburseOps runs on CSV exports from Seller Central — free tier shows total owed with a limited number of records in full, $19/month for the full list and monthly rescans. It covers four detection rules and does not file cases for you: a finder, not a service.

Wrong lead time. Most sellers enter the lead time their supplier quoted, not the one they experienced. Pull your last four purchase orders, measure PO date to FBA-receivable date — including port time, prep, and Amazon’s check-in delay — and use the 80th percentile, not the average. This one change usually moves a reorder date by two to three weeks, and it is free. If budget is tight, the free Amazon seller tools directory covers what is genuinely free in adjacent categories.

A 7-Point Check Before You Subscribe

• Confirmed the tier metric — SKUs, orders, units, or revenue? Model your own numbers, not the page’s example.
• Verified whether inbound and reserved units count toward “on hand.”
• Set per-SKU lead time from measured history, not supplier quotes.
• Backtested one reorder recommendation against what you actually sold 90 days later.
• Checked refresh frequency, and whether PPC-driven demand spikes are accounted for.
• Compared the total against Helium 10 Diamond if you already pay for it.
• Read the cancellation terms — multiple Linnworks reviewers report annual auto-renewal and difficulty cancelling.

Frequently Asked Questions

What is the best Amazon restock software in 2026?

For most FBA sellers, RestockPro at $49–$199/month is the best dedicated option: self-serve pricing, every feature at every tier, and Amazon’s Minimum Inventory Level shown next to its own recommendation. SoStocked is the better pick when seasonality and long lead times dominate, since its vendor page claims a 12-month forecast horizon. Sellerboard at $19/month wins on value if you want a stockout warning rather than a planning system. Prices checked 2026-07-25.

Do I need paid restock software if Amazon gives recommendations for free?

Not always. Amazon’s restock recommendation for Fulfilled by Merchant listings forecasts two-week demand for quantity and eight-week trends, per its March 2025 announcement, and FBA sellers have a Restock Inventory page. That is sufficient when supplier lead time is shorter than the forecast horizon. Buy software when lead time exceeds the horizon, when SKU count exceeds what you can review weekly, or when you need forecasts that account for costs and MOQs Amazon does not know.

How much do Amazon inventory forecasting tools cost?

Entry pricing ranges from $19/month (Sellerboard) to $250/month (SoStocked’s inventory package) as of 2026-07-25. RestockPro spans $49–$199/month by FBA order volume. Helium 10’s Inventory Management requires the Diamond plan at $359/month, or $279/month billed yearly. InventoryLab restock insights require Threecolts Seller 365 Pro at $199/month. Linnworks and ManageByStats do not publish list prices.

Why does my restock tool’s reorder date differ from Seller Central’s?

Because the two are solving different problems with different inputs. Amazon forecasts short-horizon demand and does not know your supplier lead time, minimum order quantity, container schedule, or landed cost. eComEngine states the difference directly on its product page: “Amazon’s idea of your ideal inventory situation and yours can be different.” A third-party tool using your measured lead time will normally tell you to order earlier and in larger batches than Amazon does.

Is restock software the same as inventory management software?

No, and conflating them is expensive. Restock software answers “when do I reorder and how much.” Multichannel inventory management software — Linnworks and its peers — answers “how do I keep stock counts consistent across Amazon, eBay, Shopify and my warehouse.” The second category is priced by custom quote with onboarding fees, and at Linnworks specifically, forecasting is a separately-priced add-on rather than the core product.

The Bottom Line

Restock forecasting is a four-number problem — velocity, days of supply, reorder point, reorder quantity — and the tools that solve it well are the ones that let you own the inputs.

The vendor landscape shifted underneath this category: SoStocked moved to SPS Commerce, InventoryLab folded into Threecolts Seller 365, ManageByStats went behind a Carbon6 login, and Jungle Scout’s Inventory Manager page no longer resolves. Verify pricing on the vendor’s current page before subscribing, and measure your own lead time before trusting any reorder date — that input is worth more than the difference between any two tools here.