Back In Stock! Alert Engine vs XFlow Back in Stock Alerts
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 11, 2026.
The short answer
- XFlow Back in Stock Alerts is detected on 6.8× as many Shopify stores as Back In Stock! Alert Engine: 690 vs 102 as of Nov 11, 2026.
- On the Shopify App Store: Back In Stock! Alert Engine 4.7 from 27 reviews and XFlow Back in Stock Alerts 5.0 from 70 reviews.
- Both list a free plan. Paid plans start at $4/month for Back In Stock! Alert Engine and $9/month for XFlow Back in Stock Alerts.
- Back In Stock! Alert Engine lists 27 features XFlow Back in Stock Alerts’s listing doesn’t mention, including Abandoned cart, Analytics, Automations.
Head to head
- United Kingdom
- United States
- Canada
- United States
- United Kingdom
- India
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free Plan
- · 50 Email Alerts
- · Custom Alert Templates
- · Custom Notify Me Button
- · Email open, delivery & read logs
- · Import/Export Subscribers
- · Restock Alert Only
Basic Plan
- · Custom Notify Me Button
- · Email open, delivery & read logs
- · Import/Export Subscribers
- · Insights
- · Restock Alert Only
- · Swap/Replace Subscriber Product
Advanced Plan
- · Custom Notify Me Button
- · Email open, delivery & read logs
- · Import/Export Subscribers
- · Insights
- · Low Stock & Restock alert
- · Swap/Replace Subscriber Product
Premium Plan
- · Custom button Product & Collection page
- · Email from your domain
- · Everything in Basic plan
- · Integrations with Klaviyo, Omnisend
- · Multi-language
- · Multi-locations (inventory)
Free
- · 1 live restock campaign
- · 5 free attributed orders
- · Branded email template designs
- · Customized Notify button on product page
- · Double opt-in (customers confirm emails)
- · Onboarding & migration, 24/7 support
Starter
- · Advanced analytics & sales report
- · Everything in Free, plus
- · SMS notifications
- · Unlimited restock campaigns
- · Web push notifications
Growth
- · Branded sender email address
- · Customized Notify button on any page
- · Everything in Starter, plus
- · Multi-language emails, AI translation
- · Shopify Flow integration
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureBack 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.
Turns back in stock into a sales strategy. Build out-of-stock waitlists with a Notify me button on all pages. Use Analytics to see demand, wait times, restock priorities & suggested quantities. Win back sales with targeted campaigns, stunning branded email templates, unlimited restock alerts by email, web push, SMS. Send at your stock threshold & shoppers’ best local time to boost open rates.
- 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!
- Restock alerts: Notify customers with back in stock automated email alerts
- Personalization: Send tailored notifications to different customer segments
- Simple automation: Set up workflows to automate back in stock emails
- Internal notifications: Notify team of new subscribers or restock demand emails
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  Back In Stock! Alert Engine |  XFlow Back in Stock Alerts |
|---|---|---|
| Detected stores | 102 | 690(ahead) |
| Net store change, 28 days | +4 | +6 |
| Stores added, 28 days | 4 | 16(ahead) |
| Big-brand share | Not enough data | 14% |
| Top store categories | Apparel & Accessories, Food, Beverages & Tobacco, Toys & Games | Apparel & Accessories, Health & Beauty, Home & Garden |
| Top store countries | United Kingdom, United States, Canada | United States, United Kingdom, India |
Reviews
| Measure | Back In Stock! Alert Engine | XFlow Back in Stock Alerts |
|---|---|---|
| App Store rating | 4.7 ★ | 5.0 ★(ahead) |
| App Store reviews | 27 | 70(ahead) |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | 0% |
Pricing
| Measure | Back In Stock! Alert Engine | XFlow Back in Stock Alerts |
|---|---|---|
| Free plan | Yes | Yes |
| Lowest paid monthly plan | $4/month(ahead) | $9/month |
| Longest free trial | 7 days | 7 days |
| Plans listed | 4 | 3 |
Listing
| Measure | Back In Stock! Alert Engine | XFlow Back in Stock Alerts |
|---|---|---|
| Shopify category rank | #23 | #19(ahead) |
| Shopify App Charts | #15 in Stock alerts | #9 in Stock alerts |
| Built for Shopify | Yes | Yes |
| Launched | Dec 23, 2024 | Dec 1, 2025 |
| Languages | 1 | 3 |
| Developer | Script Engine | XFlow |
FAQ
Back In Stock! Alert Engine and XFlow Back in Stock Alerts: common questions
- Which is more popular, Back In Stock! Alert Engine or XFlow Back in Stock Alerts?
- XFlow Back in Stock Alerts is detected on 6.8× as many Shopify stores as Back In Stock! Alert Engine: 690 vs 102 as of Nov 11, 2026.
- Is Back In Stock! Alert Engine or XFlow Back in Stock Alerts cheaper?
- Both list a free plan. Paid plans start at $4/month for Back In Stock! Alert Engine and $9/month for XFlow Back in Stock Alerts. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Which has better reviews, Back In Stock! Alert Engine or XFlow Back in Stock Alerts?
- On the Shopify App Store: Back In Stock! Alert Engine 4.7 from 27 reviews and XFlow Back in Stock Alerts 5.0 from 70 reviews.
- What features does each app list that the other doesn’t?
- Back In Stock! Alert Engine lists 27 the others don’t mention, such as Abandoned cart, Analytics, Automations, Back-in-stock emails. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Nov 11, 2026; estimated figures are labeled.
Keep comparing
More matchups
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Nov 11, 2026. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.