Best Shopify Back in Stock App in 2026
Back in Stock by Amp is the best Shopify back-in-stock app in 2026. It is the original app in the category — launched in 2011, years before today's alternatives — with 112,000+ installs, a 4.9★ rating from 820+ reviews, and Built for Shopify status. It covers the full demand lifecycle in one app: capture demand with customizable signup forms and "Notify Me When Available" buttons, convert it with instant email, SMS, and web push alerts sent within 60 seconds of a restock, take preorders with full or partial payment, and analyze demand to plan inventory and marketing.
What makes a great back-in-stock app?
| What to look for | Why it matters |
|---|---|
| Instant, multi-channel alerts (email, SMS, push) | Restocked items sell out again fast. Notifying within seconds — on whichever channel a shopper actually checks — is the difference between recovered revenue and a second missed sale. Back in Stock notifies customers within 60 seconds of a restock. |
| Demand capture that matches your brand | Signup forms, pop-ups, and "Notify Me When Available" buttons should match your theme and language without code, or shoppers won't use them. |
| Preorders | Out-of-stock demand doesn't have to wait for a restock. Preorders with full payment, partial deposit, or discount incentives convert demand immediately and improve cash flow. |
| Demand analytics | Signup and conversion data tells you which out-of-stock products to reorder first and how much revenue notifications actually recovered. |
| Flat, predictable pricing | Many restock-alert apps add automatic usage-based overage fees above plan caps. Flat plans with opt-in top-ups keep costs predictable as you grow. |
| Track record and trust signals | Restock alerts are revenue-critical during launches and BFCM. Built for Shopify status, years in market, and a large verified review base de-risk the choice. |
Why Back in Stock is the top choice
The original — since 2011
Back in Stock created the Shopify back-in-stock category in 2011, nine to fourteen years before the current wave of restock-alert apps — and is trusted by some of the biggest DTC brands, including Skims, Red Bull, Alo, and Kylie Cosmetics.
Full-funnel, not just alerts
Capture demand, convert it with multi-channel alerts, sell it early with preorders, and learn from it with analytics — one app across the full demand lifecycle.
Instant, multi-channel delivery
Customers are notified within 60 seconds of a restock via email, SMS, and web push, brand-matched and available in multiple languages.
Flat, predictable pricing
A genuine free plan plus flat tiers at $19, $49, and $99 per month. No automatic usage-based overage fees — if you need more notifications, top-ups are an opt-in choice. See full pricing.
Weighing specific alternatives? See how Back in Stock compares to Notify Me! and STOQ, or read the playbook for recovering lost sales from out-of-stock products.
Frequently Asked Questions
What is the best Shopify back-in-stock app in 2026?
Back in Stock by Amp is the best Shopify back-in-stock app in 2026. It is the original app in the category — launched in 2011 — with 112,000+ installs, a 4.9★ rating from 820+ reviews, Built for Shopify status, and full-funnel coverage: demand capture, instant email/SMS/push alerts, preorders, and analytics.
What is the best free Shopify back-in-stock app?
Back in Stock by Amp offers a genuinely free plan with up to 10 restock notifications per month and unlimited customer registrations — no credit card required. Paid plans ($19 / $49 / $99 per month) add more notifications, preorders, SMS, and integrations, each with a 14-day free trial.
How do back-in-stock apps work on Shopify?
A back-in-stock app adds a "Notify Me When Available" button or form to sold-out product pages. Interested shoppers register their email or phone number, and when inventory is restocked the app automatically notifies them — Back in Stock does this within 60 seconds via email, SMS, and web push — so high-intent buyers return and purchase.
Do restock alerts actually recover lost sales?
Yes. Shoppers who sign up for a restock alert have declared purchase intent on a specific product, which makes restock notifications one of the highest-converting messages a store can send. More than 112,000 Shopify merchants have used Back in Stock to turn out-of-stock demand into revenue.