At Once Inventory vs EmissaryWMS 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: At Once Inventory 5.0 from 1 reviews and EmissaryWMS Inventory 5.0 from 1 reviews.
- Only EmissaryWMS Inventory lists a free plan. Paid plans start at $125/month for At Once Inventory and $15/month for EmissaryWMS Inventory.
- At Once Inventory lists 3 features EmissaryWMS Inventory’s listing doesn’t mention, including Import and export, Multi-location, Real-time updates.
Head to head
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Monthly Plan
- · CSV Import & Exports
- · Forecasting & low stock notifications
- · Inventory drift log from Shopify errors
- · Multi-location stock tracking
- · Purchase Orders & Receiving
- · Stock takes
Starter
- · 2 Connected Shopify Stores
- · 2 Users
- · 50 Total Orders
- · Barcode Scanning
- · Basic Inventory Management
- · Completely Free!
Lite
- · 10 Users
- · 2000 Orders / Month
- · 5 Connected Shopify Stores
- · Barcode Scanning
- · Basic Inventory Management
- · Sync Inventory w/multiple Shopify sites
Standard
- · 10 Connected Shopify Stores
- · 30 Users
- · 5000 Orders / Month
- · Advanced Inventory Management
- · All Features of Lite Plus:
- · Unlimited Areas and Locations
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureAt 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.
Simplify managing your inventory with EmissaryWMS. Track items as they are received into your facility and shipped out to customers. Store items in multiple locations, with custom barcodes, and the ability to audit inventory. Adjust inventory levels as needed. Connect multiple storefronts to one instance and avoid using multiple backend systems to manage your inventory.
- 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
- Inventory Management: Know where your inventory is located at all times
- Cycle Counting: Audit locations and verify items and quantities are correct.
- Assignments: Give direct tasks to users to direct their workload.
- Audit Reporting: Trace all activities that occur in your facility.
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 |  At Once Inventory |  EmissaryWMS 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 | At Once Inventory | EmissaryWMS 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 | At Once Inventory | EmissaryWMS Inventory |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | $125/month | $15/month(ahead) |
| Longest free trial | 14 days | 30 days |
| Plans listed | 1 | 3 |
Listing
| Measure | At Once Inventory | EmissaryWMS Inventory |
|---|---|---|
| Shopify category rank | #245(ahead) | #349 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Apr 30, 2026 | Jun 27, 2025 |
| Languages | 1 | 1 |
| Developer | At Once | Emissary Systems, Inc |
FAQ
At Once Inventory and EmissaryWMS Inventory: common questions
- Is At Once Inventory or EmissaryWMS Inventory cheaper?
- Only EmissaryWMS Inventory lists a free plan. Paid plans start at $125/month for At Once Inventory and $15/month for EmissaryWMS 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, At Once Inventory or EmissaryWMS Inventory?
- On the Shopify App Store: At Once Inventory 5.0 from 1 reviews and EmissaryWMS Inventory 5.0 from 1 reviews.
- What features does each app list that the other doesn’t?
- At Once Inventory lists 3 the others don’t mention, such as Import and export, Multi-location, Real-time updates. EmissaryWMS Inventory lists 2 the others don’t mention, such as Scanners, Shipping. 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.