Smart inventory forecasts.

Short answer: Shopify native is enough if your operation is still relatively simple. If your real problem is “what should I buy, when, and how much?”, I'd look at Inventory Planner before jumping to Cin7. If you're actually manufacturing, Katana is the more natural upgrade. Cin7 is the broadest/most ERP-like option.

How I'd think about the four

	Best for	Where it shines	Main downside
Shopify native	Simple DTC	Stock tracking, POs, transfers, multi-location	Limited forecasting/replenishment
Inventory Planner	Forecasting & purchasing	Demand forecasting, reorder recommendations, seasonality	Doesn't replace a full operational inventory system
Katana	Manufacturing + inventory	BOMs, production, purchasing, warehouse workflows	More system than you need if you only resell
Cin7 Core	Complex/multichannel operations	Inventory + purchasing + warehouse + manufacturing + wholesale	Expensive and heavier to implement

1. Shopify native: surprisingly capable

Shopify now handles quite a lot: real-time inventory, multiple locations, transfers, purchase orders, inventory counts, bulk edits, scanners, and inventory reporting. It supports up to 1,000 locations on its current platform.

And Shopify has improved POs recently: as of June 2026, receiving a PO can create a linked transfer, including support for partial deliveries and keeping ordered/received/cost information connected.

Stay native if:

• Shopify is your dominant sales channel
• You have relatively few SKUs
• You buy finished goods rather than manufacture
• One/few warehouses
• You mostly need accurate stock counts + POs
• You can determine reorder quantities yourself

The big missing piece is true demand forecasting. Shopify's own current comparison says native inventory does not include forecasting, auto-restock, or replenishment reminders.

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2. Inventory Planner: probably the best first upgrade

This is the one I'd consider if your pain is:

"We're constantly guessing how much inventory to order."

Inventory Planner sits alongside Shopify and uses sales/inventory data to generate forecasts and replenishment recommendations. It supports different forecasting approaches including recent trends, historical sales, seasonality, and stockout history.

Its replenishment system essentially answers:

SKU → projected demand → lead time → stock cover → recommended purchase quantity.

It can also connect to multiple Shopify stores.

That's very different from merely having a Shopify PO screen.

I'd choose this if you already have a functioning Shopify inventory process but are struggling with:

• excess inventory
• stockouts
• long supplier lead times
• seasonal demand
• hundreds/thousands of SKUs
• determining reorder points
• deciding what to buy next week

In other words, don't buy an ERP to solve a forecasting problem.

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3. Katana: choose this when inventory is tied to production

Katana becomes interesting when you're not simply buying finished products.

For example:

Raw materials → production → finished goods → Shopify order

Katana can manage BOMs, manufacturing orders, production scheduling, material consumption, purchasing and inventory together. Its Shopify integration keeps orders and inventory synchronized while Katana acts as the operational/production hub.

It also has replenishment suggestions based on stock levels, open orders, sales patterns, lead times and minimum order quantities.

So:

Made in-house / assembled / kitted → Katana

Bought from suppliers and resold → Inventory Planner or Cin7

Katana's current Core plan starts at $299/month, with additional functionality such as planning/forecasting and warehouse management available as add-ons.

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4. Cin7: when inventory becomes an operational system

Cin7 is the one I'd consider when Shopify is no longer really the center of your inventory operation.

It brings together things like:

• purchasing
• inventory
• multiple warehouses
• barcode/WMS workflows
• wholesale
• B2B
• manufacturing
• accounting integrations
• multiple ecommerce channels
• forecasting
• order management

It integrates directly with Shopify and can synchronize orders, stock and product data across channels.

But there's a significant cost/complexity jump. Current Cin7 Core pricing starts at $349/month, with Pro at $599 and Advanced at $999/month, before taxes/add-ons.

I'd therefore not choose Cin7 merely because Shopify's inventory screen feels inadequate.

I'd choose it when you have a genuine operations/ERP problem.

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My decision tree

I'd use this:

Shopify → Inventory Planner

if your main issue is forecasting and purchasing.

Shopify → Katana

if your main issue is manufacturing, assemblies, BOMs or production planning.

Shopify → Cin7

if your main issue is multichannel + wholesale + warehouses + purchasing + operational complexity.

Shopify alone

if you're mostly asking, "How many do we have, where are they, and can I create a PO?"

The important distinction

Don't ask:

"Do I need a better inventory system?"

Ask:

"What inventory decision is currently being made manually?"

If the answer is "how much should we reorder?" → Inventory Planner.

If it's "how do we turn components into finished goods?" → Katana.

If it's "how do we run the whole supply/warehouse/order operation?" → Cin7.

If it's "we just need better stock counts and POs" → Shopify.

If you give me roughly SKU count + monthly orders + number of warehouses + Shopify only vs Amazon/wholesale/retail + whether you manufacture, I can tell you which of the four I'd pick and whether the extra software is likely to pay for itself.

Yes. The key is to fix the cash-conversion cycle before reaching for financing. For an ecom brand, I’d generally rank the options like this:

1. Negotiate supplier terms first

   • Move from 30% deposit / 70% shipment toward Net-30/45/60, staged payments, or smaller deposits.
   • Ask suppliers to split large POs into production/shipment milestones.
   • For proven SKUs, explore consignment or pay-on-sale arrangements.
   • Even an extra 30 days can materially reduce the amount of capital trapped in inventory. The SBA specifically recommends negotiating longer terms and notes consignment as a cash-flow tool.

2. Buy less inventory, but reorder more intelligently

   • Separate SKUs into A/B/C tiers based on velocity and contribution margin.
   • Keep deeper stock only on proven winners.
   • Stop automatically reordering slow movers just because they have historically sold.
   • Use preorder/waitlist launches for uncertain new products.
   • Discount or bundle aging inventory—even if the gross margin is ugly. Cash recovered from a 40% margin sale is often more valuable than 100% margin sitting in a warehouse.

3. Attack the ad-spend → cash conversion cycle

   Don't evaluate ads solely on ROAS. Track:

   Ad dollar → contribution profit → cash collected → inventory replenishment

   If you spend $100 on ads, generate $300 revenue, but need $140 of inventory + $70 fulfillment/fees and don't receive the cash for weeks, you're potentially growing yourself into a cash shortage despite profitable unit economics.

   I'd set a maximum allowable CAC based on cash payback, not just first-order ROAS.

4. Use your suppliers as a source of working capital

   This is often the cheapest "financing" available because you're negotiating timing rather than paying a lender.

   A good conversation is:

   "We're growing the account and want to increase order volume. If you can move us to 30/70 or Net-30, we can commit to larger/more consistent POs."

   You're effectively exchanging predictability and volume for payment terms.

5. Use a revolving line rather than repeatedly borrowing lump sums

   If you genuinely have a recurring working-capital gap, a line of credit is generally more sensible than repeatedly taking short-term advances. You draw when inventory is purchased and repay as inventory converts to sales. SBA's current 7(a) Working Capital Pilot is specifically designed around monitored lines and can lend against eligible A/R and inventory.

6. Consider inventory-specific financing for a predictable inventory cycle

   If the problem is specifically "I have to pay the factory today, but I'll sell the inventory over the next 90 days," inventory financing can make more sense than an unrestricted loan. The important thing is matching the repayment period to inventory sell-through.

7. Be very cautious with revenue-based financing / merchant advances

   They can be useful because repayment flexes with sales, but don't assume "percentage of revenue" means cheap. Current e-commerce financing products can carry substantial effective costs, and some industry sources report factor rates around 1.1–1.4.

   I'd use this only when:

   • the inventory has very predictable sell-through,
   • gross contribution margins are healthy,
   • the cash cycle is short,
   • and you've calculated the actual dollar cost of capital, not just the advertised factor rate.

The exercise I'd do first

Build a 13-week cash-flow forecast, by week, with:

**Beginning cash

• expected customer collections − inventory deposits/payments − ad spend − payroll − fulfillment/freight − taxes − other fixed expenses = ending cash**

Then add your expected inventory purchases and see exactly which week creates the cash crunch.

That tells you whether you actually need financing—or whether the problem is primarily overbuying inventory, spending on ads too early, or having supplier terms that don't match your sales cycle.

A useful target is to make the cash conversion cycle shorter: pay suppliers later, turn inventory faster, and collect customer cash sooner. That's essentially the working-capital playbook JPMorgan describes as well.

My preference for a healthy ecom brand: supplier terms → inventory optimization → ad-spend discipline → revolving LOC → inventory financing → revenue-based financing.

The further down that list you go, the more carefully I'd scrutinize the cost.

If you give me roughly monthly revenue, gross margin, inventory turns, average supplier terms, ad spend, and current cash, I can show you where the cash is getting trapped and what I'd change first.