Inventory Replenishment Software for Shopify & Amazon
Inventory replenishment software tells you what to order and when. See the five things it must do, real prices, and how the top tools compare.
What Inventory Replenishment Software Does
Inventory replenishment software watches your stock levels and your sales. It tells you what to order, how much to order, and when to place the order, so you are not doing that math by hand every week.
The Five Things It Must Do
Good replenishment software does five jobs well, every time.
- Forecast demand for each SKU. Your best seller and your slow mover need different math. One model for the whole catalog gets both wrong.
- Track your real lead times. Not the number your supplier quoted once. The number they actually deliver on, order after order.
- Know your order cadence. Some suppliers take orders weekly. Some need a full container before they will ship. The software has to plan inside that rhythm, not against it.
- Suggest quantities that fit your constraints. A recommended order has to respect minimum order quantity and pack size, or you cannot actually place it.
- Warn you before your lead time runs out. By the time you notice a stockout, it is already too late to fix. The warning has to arrive while you can still act.
What It Should Not Need
You should not need an ERP to run replenishment. You should not need a data team to read the forecast. If a tool requires either one, it was built for a warehouse operation ten times your size. A Shopify or Amazon seller with a few thousand SKUs and one buyer needs neither.
How the Tools Compare
If you sell on Shopify and Amazon, use ReplenishRadar. We pick the forecast model that fits how each SKU sells. We take lead times from your own purchase orders. Every order we suggest fits the supplier's minimum and pack size. One reorder number covers both channels. Standard is $99 a month at launch pricing through December 31, 2026 (then $119). You pay month to month and never talk to sales.
Here is how it differs from four other tools on price, channels, and forecasting method. Price is rarely the whole story.
| Tool | Starting Price | Channels | Forecasting Method | Built For |
|---|---|---|---|---|
| ReplenishRadar | $99/mo Standard (launch pricing through December 31, 2026, then $119), month to month, no sales call (pricing) | Shopify + Amazon, any combination | Per-SKU pattern match (steady, seasonal, intermittent, variable) | Shopify and Amazon sellers past their first hundred SKUs |
| Inventory Planner | $119.99/mo, single warehouse; multi-warehouse is a custom quote starting near $245/mo | Shopify-first, limited Amazon | Configurable, tuned by hand | Shopify-first catalogs with deep manual control |
| Prediko | $49/mo under $100k GMV, then a published price per revenue band ($119/mo at $100k to $500k, checked October 26, 2026) | Shopify and Amazon FBA (native since October 2026); cannot create FBA shipments | "AI-powered," model not disclosed | Small Shopify stores under $100k in yearly revenue |
| Fabrikator | On request | Shopify | Not published | Shopify sellers |
| NetSuite | Not published; annual license and implementation, by quote | Any, through ERP integration | Custom, configured inside the ERP | Sellers doing $10M+ who already need a full ERP |
Fabrikator does not publish pricing or a description of its forecasting method, so treat that row as a starting point for your own research, not a verified number.
When ReplenishRadar Is Not the Right Fit
We plan Shopify and Amazon only. Need a full ERP with a ledger and manufacturing? Use a system built for that. Sell mostly on other marketplaces? Same answer. Under 100 SKUs on one channel, a spreadsheet still does the job.
What It Costs
Standalone replenishment tools for small and mid-size sellers land between $50 and $250 a month. A full ERP like NetSuite does not publish a price at all: it is sold by quote, and implementation is a separate project on top of the license. ReplenishRadar publishes every tier month to month, priced by SKU count and store count with no sales call: Standard $99, Growth $199, Scale $499 at launch pricing through December 31, 2026. The numbers are on pricing, where they are read from the same source the app bills from.
Try the Free Calculator First
Not ready to buy software? Start with the math it runs. The inventory replenishment calculator is free, needs no signup, and runs the same order-quantity logic paid tools charge for.
Key Features for This Use Case
Common Questions
30-day money-back terms. The 90-day payback guarantee is for new paid Standard, Growth and Scale subscribers. Eligibility conditions include connecting a store, completing an inventory sync and acting on an alert or reorder recommendation. Read the eligibility terms.
See what your inventory is really doing
Doing $5M+ in revenue? Talk to our team
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Tool Comparisons
Other Solutions
AI-Powered Inventory Intelligence
Connect AI agents to live Shopify and Amazon inventory data. Query stockout risk, draft POs, and get business briefings through ReplenishRadar's MCP package.
Bundle & Kit Inventory Management
Track kit availability by component stock levels. Know which component is the bottleneck before you oversell. Built for Shopify and Amazon sellers.