How to Set Up Low Stock Alerts on Shopify (2026)

Running out of stock without warning is one of the most avoidable revenue leaks in ecommerce. Shopify has a basic built-in notification system, but it's limited — and for most growing stores, you'll need something more configurable. This guide covers how to set up low stock alerts on Shopify, how to calculate thresholds that actually make sense for your business, and which tools are worth using at different stages.

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What Shopify's Built-In Low Stock Alert Actually Does

Shopify includes a basic staff notification for low inventory out of the box. Here's how to enable it:

1. Go to Settings → Notifications in your Shopify admin
2. Scroll to Staff order notifications
3. Enable Low stock notifications
4. Set the inventory threshold (the quantity at which Shopify triggers the alert)

That's it. Shopify will send an email to staff when a product variant hits your set quantity.

The catch: it's a single threshold applied store-wide. Every product gets the same trigger point — whether it's a $5 accessory you reorder by the thousand or a $400 item you keep 10 units of at a time. For a store with more than 20–30 SKUs, this becomes noise fast.

You also can't route alerts to Slack, customize the schedule, or get any context like sell rate, days of stock remaining, or a suggested reorder quantity. It tells you that something is low. It doesn't tell you what to do about it.

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How to Calculate a Reorder Point That's Actually Useful

Before you set any threshold, you need a number that makes sense. The standard reorder point formula is:

Reorder Point = (Average Daily Sales × Lead Time in Days) + Safety Stock

Example: You sell 8 units/day of a product. Your supplier takes 14 days to deliver. You want 7 days of safety buffer.

Reorder Point = (8 × 14) + (8 × 7)
             = 112 + 56
             = 168 units

So when stock hits 168 units, it's time to reorder — not when you hit 10 or 20 units, which is what most stores default to.

The safety stock piece is where most merchants underestimate. It should account for demand variability (do you have seasonal spikes?) and supplier reliability (does your manufacturer occasionally run late?). A simple way to calculate it: take the difference between your maximum daily sales and your average daily sales, then multiply by lead time.

Safety Stock = (Max Daily Sales − Avg Daily Sales) × Lead Time

For stores with highly seasonal products, recalculate these numbers quarterly at minimum.

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Setting Per-SKU Thresholds vs. Store-Wide Defaults

Shopify's native alert uses one threshold for everything. That works if you have a handful of products. It breaks down quickly otherwise.

Consider a DTC skincare brand with 80 SKUs:

• Hero product (500 units/month, 30-day lead time): reorder point around 600 units
• Slow mover (15 units/month, 14-day lead time): reorder point around 10 units
• Seasonal item (200 units in November, 5 units other months): needs dynamic thresholds

If you set a global threshold of 50 units, you'll get constant false alarms on the slow movers and completely miss the reorder window on your hero product. Per-SKU thresholds — ideally calculated from actual sell rate data — are non-negotiable once you're past about 20 active SKUs.

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Shopify Low Stock Alert Apps: What's Worth Using

There are a lot of options in the Shopify App Store. Here's an honest breakdown of the main ones:

For simple alerting with a low budget

iAlert – Low Stock Alert ($2.99/mo) covers the basics: email and Slack alerts, variant-level rules, unlimited alerts. The interface is straightforward and it handles most use cases for stores under 50 SKUs. Complaints in reviews tend to center on customer support being slow, which matters if something breaks during a busy season.

LSA Low Stock Alert ($5.99/mo) offers daily email reports and instant notifications. It's functional but has had reported issues with alert delays and filtering glitches. Fine as a stopgap; not something to build a process around.

For forecasting + alerting combined

Bee Low Stock Alert & Forecast ($5.99/mo) is one of the better value options in this category. It combines low stock notifications with forecasting and auto-calculates reorder quantities based on sales velocity. The main limitation noted by users is that data export between stores isn't supported — a problem if you're managing multiple Shopify instances.

Stockie Inventory Management ($4.99/mo) has strong reviews (5★, 71 reviews) and offers smart forecasting using real sales history, automated reorder calculations, and multi-location tracking. Good option if you want more than alerts and don't want to spend $49+/mo.

For stores that need more depth

Prediko (from $49/mo) is a solid choice for stores doing high volume or needing sophisticated purchase order management. The tradeoff is complexity — it takes real onboarding time to get value from it, and the $49 starting price means it needs to justify itself.

Inventory Planner by Sage (pricing varies, reportedly ~$4k/year at the higher tiers) is built for serious inventory operations. Overkill for most DTC brands under $5M revenue, and users have flagged data syncing issues and slow support response.

Alertr is worth considering if you want forecasting, sell rate tracking, days-of-stock estimates, and both email and Slack alerts in one place — without paying $49–$79/mo to get there. The free tier covers up to 50 SKUs, and the Pro plan is $29/mo (currently $19/mo locked in during beta). It's built specifically for single-location DTC brands in the 100–2,000 SKU range, so the feature set is targeted rather than sprawling.

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Email Alerts vs. Slack Alerts: Which Works Better Operationally

This depends entirely on how your team operates.

Email alerts work well for:

• Solo operators or small teams
• Scheduled digests (daily or weekly low stock summaries)
• Situations where you want a paper trail

Slack alerts work better for:

• Teams where buying decisions involve multiple people
• Fast-moving inventory where timing matters (you want to know today, not when someone checks their inbox tomorrow)
• Operations where purchasing is handled by someone other than the store owner

The best setup for most growing stores: Slack for immediate alerts when a SKU crosses a critical threshold, plus a daily email digest for broader visibility. Some apps support both; check before committing.

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Common Mistakes When Setting Up Low Stock Alerts

1. Setting thresholds too low A threshold of 5 units sounds conservative, but if your lead time is 21 days and you sell 3 units/day, you'll stockout before the reorder even arrives. Work backward from lead time, not from gut feel.

2. Not accounting for variants A product with 6 size/color variants has 6 different stock situations. If you only track at the product level, you might have 200 units "in stock" while size XS is completely sold out.

3. Ignoring seasonality A flat reorder point based on average sales will fail during your Q4 spike if your average is calculated over a slow summer. Review thresholds before peak seasons.

4. Alert fatigue If every alert email feels like noise, you'll start ignoring them — and then miss the one that matters. Tune your thresholds until alerts are actionable, not just informational.

5. No reorder suggestion An alert that just says "low stock" without telling you how much to order adds a manual step every time. Tools that calculate suggested reorder quantities save meaningful time at scale.

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Step-by-Step: Getting Low Stock Alerts Working Properly

1. Audit your SKUs — segment them by velocity (fast, medium, slow movers)
2. Calculate reorder points per SKU using the formula above, or use a tool that does it automatically
3. Set thresholds in your alert tool at the reorder point level, not at a single digit
4. Choose your alert channels — Slack for urgent/immediate, email for scheduled summaries
5. Test the system — manually reduce a test product's inventory below threshold and confirm you receive the alert
6. Review monthly — sales velocity changes; thresholds should change with it

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Bottom Line

Shopify's built-in low stock notification is a starting point, not a system. For stores with more than 20–30 SKUs, the math of a single threshold breaks down quickly and you'll either miss critical reorders or drown in irrelevant alerts.

The right setup combines per-SKU thresholds based on actual sell rate data, alerts routed to wherever your team actually responds, and enough context (days of stock remaining, suggested reorder quantity) to act immediately rather than investigate.

If you're ready to stop guessing and start getting alerts that are actually calibrated to your inventory velocity, try Alertr free — the free tier covers 50 SKUs and takes about 10 minutes to connect to your Shopify store.

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