424 Inventory Sync vs At Once Inventory
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026.
The short answer
- On the Shopify App Store: 424 Inventory Sync 5.0 from 1 reviews and At Once Inventory 5.0 from 1 reviews.
- Paid plans start at $4.99/month for 424 Inventory Sync and $125/month for At Once Inventory.
- At Once Inventory lists 7 features 424 Inventory Sync’s listing doesn’t mention, including Barcodes, Import and export, Inventory tracking.
Head to head
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Basic
- · Auto-sync by SKU across products/variant
- · Real-time updates on sales and manual ed
- · “Sync now” button plus a list of duplica
Monthly Plan
- · CSV Import & Exports
- · Forecasting & low stock notifications
- · Inventory drift log from Shopify errors
- · Multi-location stock tracking
- · Purchase Orders & Receiving
- · Stock takes
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every feature424 Inventory Sync keeps stock levels consistent across products and variants that share a SKU. When inventory changes from sales or edits, it mirrors available quantity per location to all matches—automatically. It’s lightweight and focused (no bells and whistles) with a manual “Sync now” fallback.
At Once gives Shopify merchants complete inventory control. Track stock live across all locations, manage your full product catalog, and create products with auto-generated SKUs and barcodes. Scan barcodes for stocktakes and receiving. Import and export via CSV, bulk edit variants, run detailed stocktakes, and transfer stock between locations. Purchase orders, returns, edits, and cancellations sync automatically.
- Auto-sync by SKU across products/variants per location
- Real-time updates on sales and manual edits
- “Sync now” button plus a list of grouped SKUs
- Build and manage your full product catalog with auto-generated SKUs and barcodes
- Create purchase orders by location, scan to receive, and push stock to Shopify
- Adjust inventory across all locations in real time with bulk edit and CSV export
- Run multi-user stocktakes by location with barcode scanning and auto-save
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 |  424 Inventory Sync |  At Once Inventory |
|---|---|---|
| Detected stores | Not published | Not published |
| 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 | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | 424 Inventory Sync | At Once Inventory |
|---|---|---|
| App Store rating | 5.0 ★ | 5.0 ★ |
| App Store reviews | 1 | 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 | 424 Inventory Sync | At Once Inventory |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | $4.99/month(ahead) | $125/month |
| Longest free trial | 7 days | 14 days |
| Plans listed | 1 | 1 |
Listing
| Measure | 424 Inventory Sync | At Once Inventory |
|---|---|---|
| Shopify category rank | #181(ahead) | #248 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Aug 22, 2025 | Apr 30, 2026 |
| Languages | 1 | 1 |
| Developer | 424 Solutions LLC | At Once |
FAQ
424 Inventory Sync and At Once Inventory: common questions
- Is 424 Inventory Sync or At Once Inventory cheaper?
- Paid plans start at $4.99/month for 424 Inventory Sync and $125/month for At Once Inventory. 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, 424 Inventory Sync or At Once Inventory?
- On the Shopify App Store: 424 Inventory Sync 5.0 from 1 reviews and At Once Inventory 5.0 from 1 reviews.
- What features does each app list that the other doesn’t?
- 424 Inventory Sync lists 1 the others don’t mention, such as Workflow automation. At Once Inventory lists 7 the others don’t mention, such as Barcodes, Import and export, Inventory tracking, Multi-location. 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; 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. 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.