Instock by Pluglify 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 Jul 6, 2026 for Instock by Pluglify, Nov 9, 2026 for WZ Back In Stock.
The short answer
- Only WZ Back In Stock lists a free plan.
- WZ Back In Stock lists 10 features Instock by Pluglify’s listing doesn’t mention, including Back in stock, Email, Inventory tracking.
Head to head
- Japan
- United States
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 featureInstock keeps your storefront clean by automatically managing sold-out products. Hide them from collection pages, fade them while keeping product pages live, move them to the bottom, or show a Sold out badge. Get low-stock email alerts when inventory reaches your threshold. Simple setup, no code edits, and built with a Shopify theme app extension.
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.
- Hide sold-out products from collection pages automatically
- Fade sold-out items, move them down, or show a Sold out badge
- Get low-stock email alerts when inventory hits your threshold
- 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 |  Instock by Pluglify |  WZ Back In Stock |
|---|---|---|
| Detected stores | Not published | 5 |
| 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, Food, Beverages & Tobacco |
| Top store countries | Not published | Japan, United States |
Reviews
| Measure | Instock by Pluglify | 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 | Instock by Pluglify | WZ Back In Stock |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | No monthly plan listed | $9.99/month |
| Longest free trial | Not listed | 30 days |
| Plans listed | Not published | 4 |
Listing
| Measure | Instock by Pluglify | WZ Back In Stock |
|---|---|---|
| Shopify category rank | #201 | #110(ahead) |
| Shopify App Charts | Not on this week’s charts | #21 in Stock alerts |
| Built for Shopify | No | No |
| Launched | Jul 6, 2026 | Jun 11, 2026 |
| Languages | 1 | 1 |
| Developer | Pluglify | WEBOZZA |
FAQ
Instock by Pluglify and WZ Back In Stock: common questions
- Is Instock by Pluglify or WZ Back In Stock cheaper?
- Only WZ Back In Stock lists a free plan. 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 10 the others don’t mention, such as Back in stock, Email, Inventory tracking, 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 Jul 6, 2026 for Instock by Pluglify, Nov 9, 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 Jul 6, 2026 for Instock by Pluglify, Nov 9, 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.