Even If You Sell on Shopify, Amazon, Walmart & More

If you’re selling on your own site and multiple marketplaces—like Amazon, Walmart, or eBay—you already know the headache: keeping inventory synced, avoiding oversells, and catching low-stock SKUs before it’s too late.

But here’s the truth: You don’t need custom software or a full-blown ERP system to stay ahead. You can build a centralized inventory alert system with zero developer skills.

At Modonix, we’ve helped clients do exactly that—with simple no-code tools and a smart process. Here’s how you can do it too.

Why Inventory Alerts Matter (Especially for Multi-Channel Sellers)

When you sell in multiple places, the risk multiplies:

  • Overselling on one channel = account suspension risk (hello, Amazon!)

  • Delayed restocks = lost Buy Box, bad reviews, and customer churn

  • Manual tracking = slow, error-prone, and reactive

A proper alert system lets you act before you run out, and across all channels.

What You Actually Need (No Developers Required)

Here’s a simple stack that works for 99% of growing brands:

  • Google Sheets – Central dashboard for SKU quantities

  • Zapier / Make – No-code automation engine

  • Google Drive / Airtable / Notion – Optional dashboards or PO records

  • Slack / Email / SMS – Receive low-stock alerts instantly

The key? Pull inventory from all channels into one place.

Step-by-Step: Multi-Channel Inventory Alert System

Step 1: Centralize Your Inventory Data

Pull SKU quantity data from all your sources:

  • Shopify / WooCommerce: Use Zapier or API apps to send stock levels to Google Sheets.

  • Amazon / Walmart / eBay:

    • Use a third-party inventory tool (like Sellbrite, Ecomdash, or Inventory Source)

    • Or export manually once a day if you’re small and scrappy.

Goal: Get all your SKU quantities and channel-specific stock in one sheet.

Step 2: Set Reorder Thresholds

In your central spreadsheet:

  • Add a Reorder Point column per SKU.

  • Use formulas like:

    =IF(MIN(ShopifyQty, AmazonQty, WalmartQty) < ReorderPoint, “ALERT”, “”)

  • Optional: Add notes like supplier lead times, cost, or preferred vendors.

Step 3: Automate Your Alerts

Use Zapier or Make.com to:

  • Scan the sheet hourly or daily

  • If an SKU hits the reorder point, trigger:

    • Slack message (for your ops team)

    • Email (to purchasing or even your supplier)

    • SMS (for mission-critical SKUs)

Bonus: Add a tag like “Priority” for your top-selling items to escalate alerts.

Step 4: Keep it Simple & Scalable

  • Start with 10–20 key SKUs

  • Build your alert logic and automation

  • Then expand across more products and marketplaces

Optional: Go One Step Further

Here’s what advanced sellers add (still no code!):

  • Automatic PO generation: A template fills out supplier POs and emails them.

  • Forecasting formulas: Predict when you’ll run out based on sales velocity.

  • Backup inventory trigger: Alert when FBA runs out but FBM still has stock.

What Modonix Clients Are Doing

One of our clients sells on Shopify, Amazon, and Walmart.
They used to miss restock windows all the time—until we helped them build a no-code inventory alert system.

Now, their ops manager gets an SMS the same hour a top SKU drops below 10 units—across all marketplaces.
They’ve cut lost sales by 30% and haven’t had a stockout in months.

Final Thoughts

You don’t need expensive software to build smart operations.

You just need:
✅ Real-time data
✅ Simple automation
✅ The right system behind it

At Modonix, we specialize in turning chaos into clean, efficient workflows—no devs required.

Ready to Build an Alert System That Actually Works?

At Modonix, we help e-commerce brands simplify operations and take control of their inventory—without expensive software or complicated systems.

Whether you’re selling on one channel or ten, we’ll help you build lightweight, automated solutions that scale as you grow.

👉 Book a free strategy consultation with our team today:
🔗 https://modonix.com/schedule-consultation/

Let’s stop stockouts before they happen—and start building smarter systems.