Guide
Back-in-Stock Alerts for Shopify: The Complete Guide
Abibo Labs · Updated July 6, 2026 · 7 min read
Quick answer: a back-in-stock alert emails shoppers automatically when a product they saved is restocked. On Shopify you add them with an app; Abibo Wishlist sends them natively from $19/month with no separate email tool, alongside price-drop and low-stock alerts.
Why back-in-stock alerts matter
When a product sells out, the demand doesn't disappear; it just leaves without buying. A shopper who saves an out-of-stock item has told you exactly what they want. The alert closes the loop: restock happens, the email goes out, the shopper returns with intent already formed. It's the highest-signal email in ecommerce because the recipient asked for it.
The six alert types worth running
| Alert | Fires when | Why it works |
|---|
| Back in stock | A saved product is restocked | Captures formed intent at the perfect moment |
| Price drop | A saved product's price falls | Removes the main objection for hesitant savers |
| Low stock | A saved product is nearly gone | Real urgency, not manufactured scarcity |
| Reminder | Saved items sit untouched | Gentle nudge back to the wishlist |
| Saved-items summary | On a schedule you set | Digest of everything a shopper is watching |
| Weekly demand digest | Weekly, to you (merchant) | Shows what to restock and promote next |
Abibo Wishlist runs all six. The first five email your shoppers (Growth plan and up); the demand digest emails you (Pro).
Setting up alerts in Abibo Wishlist
- Install Abibo Wishlist and let shoppers start saving. Alerts are powered by wishlist saves, so the save button is the demand-capture layer.
- Upgrade to Growth ($19/mo). Alerts aren't on the Free plan; Growth turns on all shopper-facing emails.
- Open Notifications in the app. Each trigger has its own on/off toggle and a configurable frequency cap, so you control cadence per alert type.
- Branding is automatic. Your store logo and name are pulled from Shopify's brand assets into every email, with a compliant footer (store name, address, unsubscribe) added for you.
- Optional: route events elsewhere. On Pro, the same events can be emitted to Klaviyo, any ESP via webhook, or Shopify Flow, with per-trigger deduplication so no shopper is ever double-emailed.
Best practices
- Don't gate saving behind login. Guest saves grow your alert audience; Abibo merges them into accounts on login.
- Cap frequency. One well-timed alert converts; five in a week trains shoppers to ignore you. Use the per-trigger cadence controls.
- Restock what's actually wanted. The wishlist dashboard shows restock demand, and Pro's Demand Intelligence ranks back-in-stock sends by demand so the highest-intent shoppers hear first.
- Respect the unsubscribe. It's handled automatically: suppressed addresses are skipped by design, and consent status syncs back to Shopify.
FAQ
Common questions
- What is a back-in-stock alert on Shopify?
- A back-in-stock alert is an automatic email sent to shoppers who saved or asked about a product when that product is restocked. It converts existing demand you would otherwise lose.
- Do I need Klaviyo to send back-in-stock emails on Shopify?
- No. Abibo Wishlist sends back-in-stock, price-drop, and low-stock emails natively on its Growth plan ($19/month), branded with your store's name and logo. Klaviyo, ESP, and webhook integrations are optional on the Pro plan.
- Are wishlist alert emails compliant?
- Abibo's alert emails include a compliant footer with your store name, address, and an unsubscribe link. Unsubscribes are honored via a suppression list, and unsubscribing also revokes Shopify marketing consent.
- Can the same shopper get duplicate alerts?
- No. Abibo deduplicates per trigger between native sends and ESP sends, so a shopper is never emailed twice for the same event.