When products go out of stock, RestockSignal captures buyer intent with a clean, customizable widget — right on the product page.
An elegant signup form appears automatically when a product or variant is out of stock. Customers enter their email in one click.
Customers sign up for the specific size, color, or option they want — not just the product. You get precise demand data.
Works with any Shopify theme. The widget adapts to your store's design with zero custom code.
Shopify fires an inventory webhook when you restock. RestockSignal picks it up and emails waitlisted customers — automatically, in under 60 seconds.
No polling. No manual triggers. Inventory webhooks fire the moment stock changes — and we send within 60 seconds.
SPF/DKIM-verified sending via Postmark. Your alerts land in the primary inbox, not spam or promotions.
Customers get instant confirmation when they join a waitlist. Builds trust and reduces "did it work?" anxiety.
Know exactly which products are in demand, how many customers are waiting, and how your restock alerts perform.
See waitlist counts by product and variant. Identify high-demand items and prioritize restocking decisions.
Track emails sent, customers notified, and unsubscribe rates. Know your alert performance at a glance.
Use waitlist data to inform purchasing decisions. Restock what your customers are actually waiting for.
Every decision we make prioritizes your brand and your customer's experience. Clean messaging, easy opt-out, and no dark patterns.
Built-in, compliant unsubscribe flow in every email. Protects your brand and keeps deliverability clean.
Customers actively choose to be notified. No pre-checked boxes, no assumed consent, no spam.
Smart rate gates prevent email flooding when high-demand products restock. Controlled, reliable delivery.
Install the Shopify app, and the widget is automatically added to your product pages. We handle the rest.
Add the app, enable the widget block, and you're live. No code changes, no developer needed.
For beta partners, we install and configure everything — then run a test alert to confirm the full flow works.
Hosted on Fly.io with Supabase Postgres and Postmark email. Built to be fast, reliable, and available.
We'll install, test, and share initial results within a week. Free for 3 months, no card required.
Start your free pilot →