SlothRocket: Back in Stock vs WZ Back In Stock
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026 for SlothRocket, Nov 3, 2026 for WZ Back In Stock.
The short answer
- Both list a free plan. Paid plans start at $19/month for SlothRocket and $9.99/month for WZ Back In Stock.
- WZ Back In Stock lists 11 features SlothRocket’s listing doesn’t mention, including Email, Inventory tracking, Low stock.
Head to head
- Japan
- United States
Free
- · 30 restock alert emails per month
- · Live stock re-verification
- · Notify me widget included
Pro
- · Easy discount code - Shopify integrated
- · On-brand emails (logo, colour and more)
- · Quiet hours setting
- · Reminders for non-buyers
- · Rich demand insights
- · Unlimited alerts
Free
- · 50 restock email notifications/month
- · Basic button and form customization
- · Basic reports
- · Email sender setup
- · Storefront notify popup
- · Unlimited waitlist signups
Lite
- · 500 restock email notifications/month
- · Alert email template customization
- · Basic reports
- · Button and form customization
- · Delivery logs
- · Gmail/SMTP email sender
Startup
- · 1,000 restock email notifications/month
- · Advanced customization
- · Everything in Lite
- · Low-stock alerts
- · Recovered revenue tracking
- · Reports by product/variant
Business
- · 5,000 restock email notifications/month
- · Everything in Startup
- · Higher notification volume
- · More low-stock alert capacity
- · Priority-ready plan for growing stores
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureBack in Stock lets shoppers sign up to be notified when a sold-out product returns, and emails them the moment it does. Before every send, it re-checks live Shopify inventory, so shoppers are only emailed when the item is truly available again. Merchants see which products and variants are most in demand, so they know what to restock. Emails carry the store's name, logo, colour, and an optional discount code.
Back In Stock helps Shopify merchants capture demand when products or variants sell out, then notify interested customers as soon as inventory returns. The app adds a notify experience to sold-out product pages through a Shopify theme app embed and optional app block. Shoppers can leave their email address for a specific unavailable variant.
- Re-checks live stock before every send, so shoppers don’t get a false alert
- Send unlimited restock alerts, with automatic reminders to recover more sales
- Shows demand by product and variant, so you know exactly what to restock
- On-brand emails with your store's logo, colour, and an optional discount
- Capture waitlists from sold-out products and variants
- Send automatic restock alerts through Gmail or SMTP
- Customize the notify button, popup form, and email design
- Track signups, email clicks, recovered sales, and revenue
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 |  SlothRocket |  WZ Back In Stock |
|---|---|---|
| Detected stores | Not published | 4 |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Apparel & Accessories, Arts & Entertainment, Hardware |
| Top store countries | Not published | Japan, United States |
Reviews
| Measure | SlothRocket | WZ Back In Stock |
|---|---|---|
| App Store rating | Not published | 5.0 ★ |
| App Store reviews | Not published | 1 |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | SlothRocket | WZ Back In Stock |
|---|---|---|
| Free plan | Yes | Yes |
| Lowest paid monthly plan | $19/month | $9.99/month(ahead) |
| Longest free trial | Not listed | 30 days |
| Plans listed | 2 | 4 |
Listing
| Measure | SlothRocket | WZ Back In Stock |
|---|---|---|
| Shopify category rank | #305 | #123(ahead) |
| Shopify App Charts | Not on this week’s charts | #21 in Stock alerts |
| Built for Shopify | No | No |
| Launched | Aug 3, 2026 | Jun 11, 2026 |
| Languages | 1 | 1 |
| Developer | Sloth Rocket | WEBOZZA |
FAQ
SlothRocket and WZ Back In Stock: common questions
- Is SlothRocket or WZ Back In Stock cheaper?
- Both list a free plan. Paid plans start at $19/month for SlothRocket and $9.99/month for WZ Back In Stock. 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?
- WZ Back In Stock lists 11 the others don’t mention, such as Email, Inventory tracking, Low stock, Notification button. 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 Oct 14, 2026 for SlothRocket, Nov 3, 2026 for WZ Back In Stock; 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 Oct 14, 2026 for SlothRocket, Nov 3, 2026 for WZ Back In Stock. 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.