Back In Stock! Alert Engine vs SyncStock: Restock Alerts
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 6, 2026.
The short answer
- Only Back In Stock! Alert Engine lists a free plan. Paid plans start at $4/month for Back In Stock! Alert Engine and $50/month for SyncStock.
- Back In Stock! Alert Engine lists 35 features SyncStock’s listing doesn’t mention, including Abandoned cart, Alert settings, Analytics.
Head to head
- United States
- United Kingdom
- Australia
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)
SyncStock Pro
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.
Most restock apps alert per product. SyncStock alerts by size: shoppers save their sizes once and hear about every pair that fits, not one item at a time. It waits for your drop to finish, then sends one email per shopper with every match, so no inbox spam. You see exactly which sales came from alerts, even Shop Pay checkouts, and which sizes shoppers want most, so you buy inventory that sells.
- 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 by size, price range, and condition, sent by email and push
- Waits for your drop to finish, then sends one email per shopper
- Website plugin to redirect customers to their restock alerts page in one click
- Tracks sales from alerts, including Shop Pay and Buy it now checkouts
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 | |
|---|---|---|
| Detected stores | 85 | Not published |
| Net store change, 28 days | +3 | 0 |
| Stores added, 28 days | 3 | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Apparel & Accessories, Food, Beverages & Tobacco, Health & Beauty | Not published |
| Top store countries | United States, United Kingdom, Australia | Not published |
Reviews
| Measure | Back In Stock! Alert Engine | |
|---|---|---|
| App Store rating | 4.9 ★ | Not published |
| App Store reviews | 26 | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | Back In Stock! Alert Engine | |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $4/month(ahead) | $50/month |
| Longest free trial | 7 days | 7 days |
| Plans listed | 4 | 1 |
Listing
| Measure | Back In Stock! Alert Engine | |
|---|---|---|
| Shopify category rank | #21 | Not enough data |
| Shopify App Charts | #15 in Stock alerts | Not on this week’s charts |
| Built for Shopify | Yes | No |
| Launched | Dec 23, 2024 | Nov 5, 2026 |
| Languages | 1 | 1 |
| Developer | Script Engine | SyncStock |
FAQ
Back In Stock! Alert Engine and SyncStock: common questions
- Is Back In Stock! Alert Engine or SyncStock cheaper?
- Only Back In Stock! Alert Engine lists a free plan. Paid plans start at $4/month for Back In Stock! Alert Engine and $50/month for SyncStock. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- Back In Stock! Alert Engine lists 35 the others don’t mention, such as Abandoned cart, Alert settings, Analytics, Auto-alerts. 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 6, 2026; estimated figures are labeled.
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 6, 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.