This is an info Alert.
x402 Logo
  • Product
    • Become Agent-Ready
      • Merchants
        Agentic Commerce — list your store across ChatGPT, Gemini, Claude & Perplexity
      • Publishers
        Monetize your content when AI agents read, cite, or train on it
      • SaaS Companies
        Treat AI agents as first-class customers with agent-priced checkout
    • Monetize
      • Monetize MCP Server
        Charge per call on any MCP server in 2 minutes
      • Monetize AI Agents
        Turn n8n, Zapier, Activepieces workflows into revenue
      • Agent Feed
        Pay-per-query access to licensed publisher content for your agents
  • Resources
    • xpay Ecosystem
      • xpay✦ Tools
        1,000+ pay-per-use tools for your AI agents
      • Agent-Ready SaaS Index
        25,481 SaaS scored on agent-buyability
      • SaaS Pricing Database
        Pricing pages indexed across 1,000+ categories
      • Shopify Apps Directory
        Every Shopify app, with its full review history
      • GitHub
        Open source repositories
    • Agent Building
      • Agent Frameworks
        AI frameworks for building multi-agent systems
      • x402 Integration
        AI frameworks with x402 payment integration
      • Networks
        Blockchain networks supporting x402
    • Company
      • About xpay✦
        Our mission, products, and protocols
      • Blog
        Latest insights and updates
      • Docs
        Complete xpay documentation
  • Pricing
  • Blog
  • Docs
Get Started
  1. xpay

  2. Shopify apps

  3. Email marketing

  4. Back In Stock! Alert Engine

Back In Stock! Alert Engine

by Script Engine

4.9

(22 reviews)

64/100 · SolidFree
Best suited for stores using Klaviyo, Omnisend, or Notify me to re-engage customers when out-of-stock items return.

Notify customers by restock alert when items are back in stock & create an out-of-stock waitlist. Back in Stock! Alert Engine is an all-in-one marketing tool to help you recover lost sales. Don't miss out on lost sales with Back In Stock & Restock Alerts, Abandoned carts, price drop, and low stock notifications through Emails. Shows the Notify Me!! button on out of stock products and automatically sends notifications when they get in stock. Creates the out-of-stock & price drop waitlists to see products in demand. Fully customize all notifications, grow your mailing list, and much more !! Back in Stock! Alert Engine is an all-in-one marketing tool to help you recover lost sales. Don't miss out on lost sales with Back In Stock & Restock Alerts, Abandoned carts, price drop, and low stock notifications through Emails. Shows the Notify Me!! button on out of stock products and automatically sends notifications when they get in stock. Creates the out-of-stock & price drop waitlists to see products in demand. Fully customize all notifications, grow your mailing list, and much more !! more Restock Alerts: Send automatic and manual back in stock notifications via Email. Setup Notify Me Buttons in Minutes; Customize Buttons to Match Brand Guidelines. Grow Email Lists & Sync to Email Providers Like Klaviyo. Restock alert, Low stock alert, price drop alert, multilingual tools, and more! Compatible with Almost Every Theme, & Support is Available to Assist 24/7!

Copy from the Shopify App Store listing, unedited.
View on ShopifySee the scorecard
Who it’s for
Email marketing
What it moves
Top line

conversion rate and average order value

What it costs
Free
How it’s supported
64/100

Solid · from 22 reviews

What it does

Restock Alerts: Send automatic and manual back in stock notifications via Email.

Setup Notify Me Buttons in Minutes; Customize Buttons to Match Brand Guidelines.

Grow Email Lists & Sync to Email Providers Like Klaviyo.

Restock alert, Low stock alert, price drop alert, multilingual tools, and more!

Compatible with Almost Every Theme, & Support is Available to Assist 24/7!

Plan fit
There is no plan to choose

The listing shows this as free, with no paid tiers published — so there is no volume question to answer and nothing to size yourself against. Check the listing for in-app charges before you rely on that.

64

/ 100
Solid
low confidence

Scored on 22 merchant reviews we hold for Back In Stock! Alert Engine, across five checks. Every figure is computed from those reviews — expand any row to see the counts behind it.





Computed from the 22 reviews we hold, with 12-month windows measured to 2026-08. This scores the public review record — it is not a review of the software itself, and a low score often means we hold little evidence rather than poor evidence.
Review history
2025–2026 · 22 reviews read
Reviews per year
202514 reviews
20268 reviews
What merchants say

4.9

22 reviews
5★95%
4★0%
3★0%
2★0%
1★5%
Developer replies
68%
of reviews get an answer
Reviewed at 12m+
0%
had used it a year when they wrote
From 22 reviews read. Typical reviewer had used the app for 6 days. Most merchants review in their first month, so this reflects when people write — not how long they stay.
Recent merchant reviews

The newest 8 of 22. Open one to read it in full, with the developer's reply where there is one.

Excellent app and customer support. They even fixed an issue caused by another app dev team. Amazing.

The app is easy to setup and the support team is very responsive and helpful.

Great app and great support, thank you !

App looks good, has a feature to Remind customer of the restock . Helpful

This is the second app from Script Engine that we are using on our site, we have used the Wish List app for a couple of years and that is how we learned they had released a Back in Stock app. After reviewing it and getting in touch with the developers, they soon confirmed that they would soon be implementing an integration with Omnisend, the email marketing software we use, and based on this and the good experience with the Wish List app, we decided to migrate from our existing back in stock app to this one. The team have been very proactive and building our suggestions into the app and any that haven't been immediately possible they are reviewing and planning for the future, which is great. Being based in the UK and therefore on a different time zone can cause some difficulties in emergency situations but everything has always got resolved. We are now very happy being able to design exactly the emails we want and very accurately monitor opens, clicks and purchases. Plus the design of the app and admin is nice, easy to set up as well. Thanks to the Script Engine team for being very patient with us and getting us up and running!

Developer repliedThank you so much for sharing great feedback. :) It’s always amazing to hear that we’ve been successful in our goal of providing our customers with the best possible experience. Show more

Tolle, einfach zu bedienende App. Funktioniert reibungslos. Ich hatte ein Problem mit dem hinzufügen von Produkten auf die "nicht benachrichtigen Liste". Der Support hat schnell geholfen und das Problem beseitigt. Danke und ich kann die APP nur empfehlen.

Developer repliedThank you so much for sharing the wonderful experience. I’m glad to hear that you’re enjoying your experience with our app. Feel free to contact us for any queries at support@scriptengine.net or in-app chat, we are always happy to help you. Show more

Very straight forward to use, the integration is simple and has what you need. Customer service is fast and responsive. Great app, great customer service.

Developer repliedThank you very much for your great & wonderful feedback, It puts a big smile on our face. We are grateful to have a client like you. :) :) For any queries, feel free to contact us at support@scriptengine.net, we are always happy to help you. Show more

great app! I contacted them to help me out with customizing the app for a specific product and they answered very quickly and fixed it!

Developer repliedThank you very much for sharing your great & valuable experience with our service and app!! It means a lot to us!! For any queries, feel free to contact us at support@scriptengine.net, we are always happy to help you. Show more

Back In Stock! Alert Engine FAQ

Answered from this app's own listing and its full review record.

Best suited for stores using Klaviyo, Omnisend, or Notify me to re-engage customers when out-of-stock items return.

The Shopify App Store lists this app as “Free”. It does not publish plain monthly prices we can compute against.

On our scorecard Back In Stock! Alert Engine rates 64 out of 100 — solid — read from 22 merchant reviews. The developer has published replies to 15 of 22 reviews. The score reflects what the review record shows, nothing more.

22 merchants have reviewed Back In Stock! Alert Engine, averaging 4.9 out of 5. We hold the review history from 2025 to 2026, which is what the year-by-year chart on this page is built from.

Quick facts
At a glance
Merchant rating

4.9 / 5 · 22 reviews


Rating, last 12 months

4.73 from 15 reviews


New reviews, last 12 months

15 (was 7)


Developer replies

15 of 22 reviews


Typical reviewer had used it

6 days


Pricing

Free


On the App Store since

December 23, 2024


Review history held

2025 – 2026

Integrates with
Shopify Admin
Klaviyo Email Marketing
notify me
Notify me
Omnisend Email Marketing
out of stock
pagefly

Categories
Email marketingStock alerts
Will AI shoppers find this store?

Apps like this one convert the traffic you already have. Getting recommended by ChatGPT and Perplexity is a separate problem.

Run a free readiness check
Alternatives
Instead of Back In Stock! Alert Engine

Same categories, by review volume.

Shopify Flow
4.711,469 reviews

Pop Convert ‑ Pop Ups, Banners
4.98,565 reviews

SendWILL Popup Email Marketing
4.97,467 reviews

Shopify Messaging
4.74,051 reviews

Privy ‑ Email, SMS & Pop Ups
4.53,973 reviews

Omnisend Email Marketing & SMS
4.72,939 reviews
Related reading
Guides covering these apps

Klaviyo vs Mailchimp for AI commerce

x402 Logo

The agent-readiness stack for the AI shopping era — helping merchants, publishers and SaaS companies get discovered, cited and transacted with by ChatGPT, Perplexity, Claude, Gemini and the custom shopping agents underneath them.

CompanyAgentically Inc. (d/b/a xpay✦)1875 Mission St, Ste 103San Francisco, CA 94103, United Stateslegal@xpay.sh · privacy@xpay.sh
or ask your AI app
Company
About xpayAgency PartnersGitHubDiscordllms.txt
DevelopersDocumentationAPI ReferenceSDKs & LibrariesQuickstart GuideOpenAPI Spec
Stay Updated
Occasional product updates and agent-readiness playbooks from xpay (Agentically Inc.) — typically a couple of emails a month. Double opt-in: we email you a link to confirm before sending anything, and every email has one-click unsubscribe.
Social
  • For Publishers
    • News
    • Finance
    • Dev / Tech
    • Travel
    • View all verticals
  • Agent Feed
    • AI Search Engines
    • RAG Builders
    • Browser Agents
    • Vertical Research
    • Browse full catalog
  • Agent-Ready Index
    • SaaS Pricing Database
    • Agent-Ready SaaS Index
    • Verified band
    • AI & ML
    • Sales & CRM
  • Products
    • Pricing Widget
    • Monetize MCP Server
    • Paywall
    • Smart Proxy
    • Monetize AI Agents
    • xpay x402 Facilitator
  • Agentic Economy
    • Timeline
    • Resources
    • Manifesto
    • Stack
  • Agentic Commerce
    • Get listed
    • ChatGPT Ads
    • How ChatGPT Ads work
    • ChatGPT Ads · Apparel
    • ChatGPT Ads · Health & Beauty
    • xpay Listings · Amazon + Google
    • Pricing
    • Free audit
    • Shopify
    • WooCommerce
    • Apparel & Accessories
    • Health & Beauty
    • Overview
  • Commerce Index
    • Shopify apps directory
    • Agentic Commerce Ready Index
    • Methodology
    • Pet brands · WooCommerce
    • Pet brands · Shopify
  • Marketplace
    • 🛍️ xpay.deals — agentic storefront for deals
  • Protocols
    • Overview
    • x402
    • MPP
    • UCP
    • ACP
    • AP2
    • TAP
    • A2A
  • Agent Frameworks
    • Overview
    • LangChain
    • CrewAI
    • Claude MCP
    • AutoGPT
    • LangChain vs Mastra
    • LangGraph vs Pydantic AI
  • Company
    • About xpay
    • Blog
    • Docs
    • GitHub
  • Free prompts
    • Ecommerce prompts
    • Email marketing prompts
    • Product description prompts
    • Facebook ad prompts
    • Skincare prompts
    • Supplement prompts
    • Wine prompts
    • Electronics prompts

© 2025 Agentically Inc. All rights reserved.
Privacy PolicyTerms of UseAcceptable Use Policy