Restock alert benchmarks: what to expect

If you've never sent a restock alert before, here's what the data says you should expect — and the levers that move the numbers in either direction.

Open rate: 58–65%

Back-in-stock notifications open at 2–3× higher than normal marketing email. The reason is simple: the customer already raised their hand. They wanted the product. You're not pushing — you're answering.

Sources: Omnisend 2025 benchmark report (58% across all back-in-stock emails on their platform); Barilliance 2024 ecommerce benchmark (65.32%). Average marketing email opens at 20–25%.

Click-through rate: 18–25%

The Omnisend benchmark for back-in-stock click-through is 21%. Strong shops do better than that; shops with weak product images and generic copy do worse. The single biggest lever on click rate is the email's hero: a clean photo of the actual product the customer bought before, not a stock image.

Conversion: 25–50%

This is where the variance lives. The lower bound (25%) is what you'll see if you send a generic blast without much personalization. The upper bound (50%) is what shops get when the message mentions the customer's last purchase by name, the alert goes out within hours of restock, and inventory is genuinely low — there's urgency.

What drives the variance

• Speed. Alerts sent within 6 hours of restock convert about 40% better than ones sent the next day.
• Personalization. Messages that name the customer's last purchase outperform generic "It's back!" messages by ~30%.
• Scarcity. If you genuinely have limited stock, say so — "About 8 left" beats "Back in stock!" most of the time.
• From line. "Maria at the shop" outperforms "Fazio's Chocolates" which outperforms "Fazio's Chocolates Marketing." Customers respond to humans.
• Subject line. Specific outperforms clever. "Your hazelnut truffles are back" beats "We have a treat for you."

What we measure

Restock Notify tracks open, click, and order-back on every alert sent. The Alert Revenue tile on the dashboard shows you what dollars were attributable to an alert in the last 30 days — and we attribute conservatively. We only count revenue when the customer clicked the alert and ordered within 7 days.

When to expect results

Opens stabilize within 24 hours of send. Clicks within 48. Conversions roll in over 7 days — most within the first 72 hours, a long tail trickling in over the week.