Restock Rocket is a back-in-stock alert app for Shopify that emails waiting customers within 60 seconds of restock.
A sold-out variant doesn't have to be a lost sale. Capture the demand with a notify-me widget, alert everyone the moment stock returns — before they buy elsewhere — and see the recovered revenue on your dashboard.
- Alerts in < 60 s — measured
- 2-minute setup
- Free plan: 50 alerts/mo
- Optional double opt-in (GDPR)
- 14-day free trial on paid plans
Trail Runner Sneaker
$129.00
The widget appears automatically on out-of-stock variants. Colors and texts are yours to change.
A restock alert that arrives an hour late is an alert to a customer who already bought elsewhere
Some category leaders send alerts with delays of 30 minutes to several hours — and charge up to $90/month for it. Speed is the whole point: the first store back in the shopper's inbox wins the sale.
Under 60 seconds, not under an hour
Restock Rocket reacts to Shopify's inventory webhook the instant a variant comes back and pushes emails through a dedicated send queue. The target: alert sent in under 60 seconds from restock.
Speed you can verify, not a slogan
Every alert's latency is measured and logged. Your dashboard shows the median, the 95th percentile, and the share of alerts sent under 60 seconds. If we're slow, you'll see it — that's the deal.
See the money it brings back
Clicks are tracked, and orders containing the product within 72 hours of a click are counted as recovered sales. The dashboard shows recovered revenue in dollars — not vanity metrics.
From sold out to sale recovered, in 3 steps
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Add the widget — 2 minutes
Install the app and drag the “Notify me when available” block onto your product template in the theme editor. It shows itself automatically on out-of-stock variants only.
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Customers queue up
Shoppers leave their email on the exact variant they want. Every signup is logged per product and variant — that's your latent demand, ranked in the Demand Report.
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Restock → email in < 60 s
You update inventory as usual. Restock Rocket catches the webhook, sends every waiting customer a branded email within the minute, and attributes the orders that follow.
Everything you need to stop losing restock sales
Notify-me widget
A Theme App Extension block — no code in your theme files. Appears automatically when the selected variant is out of stock; colors and all texts configurable from the admin.
Sub-60-second alerts
Shopify's inventory_levels/update webhook feeds an immediate send queue with automatic retries. No polling, no batching delays, no waiting for a cron job.
Measured latency, on display
p50, p95, and % of alerts under 60 seconds — computed from your store's real alerts and shown on the dashboard. We publish the number instead of asking you to trust it.
Branded emails
Responsive email template with your logo, your colors, and a customizable from name (Growth+). Delivered via Resend over an authenticated sending domain (DKIM/SPF).
Double opt-in for GDPR
Optional toggle: subscribers confirm their email before receiving alerts. Ideal for EU merchants who want an explicit, provable consent trail. (Growth+)
Recovered revenue attribution
An order containing the product within 72 hours of an alert click counts as a recovered sale. The dashboard totals recovered sales and revenue. (Pro)
Demand Report
Your out-of-stock products ranked by waiting customers — a restock priority list built from real demand, not gut feeling. CSV export on Pro. (Growth+)
Anti-spam built in
Per-IP rate limiting, a hidden honeypot field to stop bots, and email format validation keep your subscriber list clean and your sending reputation intact.
Light by design
Vanilla JavaScript, deferred loading, no external frameworks on your storefront. Your Core Web Vitals stay exactly where they were. Privacy policy.
Honest plans, billed through Shopify
14-day free trial on paid plans. Upgrade, downgrade or cancel anytime — billing appears on your regular Shopify invoice.
Free
$0 / month
Free forever
- 50 alert emails / month
- Notify-me widget on out-of-stock variants
- Widget colors & texts configurable
- Signups per product & variant
- Measured latency on the dashboard
Growth
$19 / month
14-day free trial
- Everything in Free
- 500 alert emails / month
- Custom email branding (logo, colors, from name)
- Double opt-in (GDPR)
- Demand Report
Pro
$49 / month
14-day free trial
- Everything in Growth
- Unlimited alert emails
- Priority sending queue
- Recovered sales & revenue attribution
- Demand Report CSV export
Frequently asked questions
What is the best back in stock app for Shopify?
It depends on what you need. Back in Stock: Restock Alerts has the longest track record in the category and adds SMS and email-platform integrations — a strong choice for large stores with complex marketing stacks. Notify Me! Back in Stock by Essential Apps has a huge review base, a free tier, and multi-channel alerts. Restock Rocket is the best fit if alert speed and honest pricing matter most: alerts target under 60 seconds from restock, the app measures and displays its own latency (p50/p95 and % under 60 s) on your dashboard, and plans run from free to $49/month with unlimited alerts on the top tier — plus a Demand Report that ranks out-of-stock products by waiting customers.
How fast are Restock Rocket alerts?
Restock Rocket listens to Shopify's inventory webhook and queues alert emails the moment a variant comes back in stock — the target is under 60 seconds from restock to email sent. Unlike most apps, it measures its own latency on every single alert and shows you the real numbers on your dashboard: median (p50), 95th percentile (p95), and the percentage of alerts sent in under 60 seconds. The full pipeline is documented in how alerts work.
Restock Rocket vs Back in Stock: Restock Alerts — which should I choose?
Back in Stock: Restock Alerts is the category veteran: SMS alerts, deep integrations with email platforms like Klaviyo and Mailchimp, and years of reviews. Its plans scale with notification volume, up to roughly $90/month on higher tiers. Restock Rocket is email-first and built around measured alert speed and price (free plan, unlimited alerts at $49/month). If you need SMS or a Klaviyo-centric workflow, choose Back in Stock. If you want the fastest possible email alert at a fair price, plus a Demand Report, choose Restock Rocket. Full comparison.
Does the notify-me widget slow down my store?
No. The widget is a Shopify Theme App Extension block written in plain vanilla JavaScript — no framework, small footprint, loaded deferred so it never blocks your page rendering. It appears automatically only when the selected variant is out of stock. There is no measurable impact on Core Web Vitals.
Is Restock Rocket GDPR compliant?
Yes. The app stores only what it needs — the customer's email and the variant they are waiting for — and offers an optional double opt-in mode so subscribers confirm their address before receiving alerts. All mandatory Shopify privacy webhooks (customers/data_request, customers/redact, shop/redact) are implemented and honored. Emails are delivered through Resend, acting as a data sub-processor. Details in the privacy policy.
What counts as an alert, and what happens when I reach my monthly limit?
One alert = one back-in-stock email sent to one subscriber. The Free plan includes 50 alerts per month and Growth includes 500; Pro is unlimited. When you reach your limit, new alerts are paused — not lost: the dashboard shows how many are waiting, and customers can keep signing up on the widget. Upgrade at any time to resume sending; quotas reset with your monthly billing cycle. See billing & plans.
How does recovered revenue attribution work?
Every alert email links to the product with tracking parameters. When a subscriber clicks the alert and an order containing that product is placed within 72 hours of the click, Restock Rocket counts it as a recovered sale and adds the product's value to your recovered revenue metric. Attribution requires read access to orders and is available on the Pro plan.
Is there a free plan, and how does the trial work?
Yes. The Free plan includes 50 alert emails per month and the standard notify-me widget, forever. Growth ($19/month) and Pro ($49/month) both come with a 14-day free trial. Billing is handled entirely by Shopify — it appears on your regular Shopify invoice, and you can cancel anytime by uninstalling.
Stop letting restocks go unnoticed
Add the notify-me block in 2 minutes. The next time you restock, every waiting customer knows within the minute.
Install on the Shopify App Store