Inventory Replenishment Software for Shopify and Amazon Sellers

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

Here is how five tools stack up on price, channels, and forecasting method. Price is rarely the whole story.

Tool	Starting Price	Channels	Forecasting Method	Best For
ReplenishRadar	Published, 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 who want a published price
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-only sellers who want deep manual control
Prediko	$49/mo under $100k GMV; custom pricing above that	Shopify only	"AI-powered," model not disclosed	Small Shopify stores under $100k in yearly revenue
Fabrikator	On request	Shopify	Not published	Shopify sellers comparing niche planning apps
NetSuite	$1,500+/mo, plus $50,000+ in typical implementation cost	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.

What It Costs

Standalone replenishment tools for small and mid-size sellers land between $50 and $250 a month. A full ERP like NetSuite starts well above $1,500 a month, and that is before implementation, which routinely runs into five figures. ReplenishRadar publishes every tier month to month, priced by SKU count and store count with no sales call. 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.