Shelf OS vs Vamao Inventory OS
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 Shelf OS, Oct 13, 2026 for Vamao Inventory OS.
The short answer
- Only Shelf OS lists a free plan. Paid plans start at $19/month for Shelf OS and $19/month for Vamao Inventory OS.
- Shelf OS lists 11 features Vamao Inventory OS’s listing doesn’t mention, including Analytics, Auto-processing, Email notifications.
Head to head
Free
- · 1 Store
- · 1 location
- · 90 days sales history
- · Top 100 variants by revenue
Starter Monthly
- · 1 location
- · 2,000 variants
- · 90 days of history
- · CSV and PDF exports
- · Every number shows its math
- · Weekly buy-list email
Growth Monthly
- · 10,000 variants
- · 3 locations
- · 365 days of history (seasonality)
- · Budget Mode
- · Everything in Starter
- · Stockout risk alerts
Pro Monthly
- · Everything in Growth
- · Open to Buy
- · Slack digest
- · Unlimited variants and locations
- · Up to 3 stores
Starter Annual
- · Same Features as Starter Monthly
Growth Annual
- · Same Features as Growth Monthly
Pro Annual
- · Same Features as Pro Monthly
Starter Monitoring
- · Daily sync and reorder planning
Growth Monitoring
- · Hourly sync and 3-shop monitoring
Migration Audit
- · One-time migration audit
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureSome products are about to sell out, others are dead money, and telling which — and how much to buy — means a spreadsheet every week. Shelf OS reads your sales and stock and returns one buy list, sorted by what runs out first, with quantities that respect case packs and supplier minimums. Click any number to see the arithmetic in plain English. Set a budget and it allocates across your most urgent lines.
Vamao Inventory OS helps merchants run daily buying work without a heavy ERP. Connect a store, sync products, variants, vendors, locations, and inventory, then review reorder decisions, purchase orders, receiving, cycle counts, liquidation actions, alerts, and audit history. CSV import remains available for migration and fallback uploads.
- Buy list with a verdict: what runs out first, how much to order, from whom.
- Budget Mode allocates your spend across the most urgent reorders
- Printable supplier purchase orders and barcode label PDFs
- Every number shows its math — click any qty to see why
- Know what to reorder, pause, or liquidate before stockouts interrupt sales.
- Create supplier-ready purchase orders and receive partial shipments.
- Run cycle counts with camera, USB scanner, or manual SKU entry.
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 |  Shelf OS |  Vamao Inventory OS |
|---|---|---|
| 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 | Shelf OS | Vamao Inventory OS |
|---|---|---|
| App Store rating | Not published | Not published |
| App Store reviews | Not published | 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 | Shelf OS | Vamao Inventory OS |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $19/month | $19/month |
| Longest free trial | Not listed | Not listed |
| Plans listed | 7 | 3 |
Listing
| Measure | Shelf OS | Vamao Inventory OS |
|---|---|---|
| Shopify category rank | #669 | #669 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Aug 11, 2026 | Jun 11, 2026 |
| Languages | 1 | 1 |
| Developer | Phase Group LLC | VamaoLabs |
FAQ
Shelf OS and Vamao Inventory OS: common questions
- Is Shelf OS or Vamao Inventory OS cheaper?
- Only Shelf OS lists a free plan. Paid plans start at $19/month for Shelf OS and $19/month for Vamao Inventory OS. 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?
- Shelf OS lists 11 the others don’t mention, such as Analytics, Auto-processing, Email notifications, Forecasting. Vamao Inventory OS lists 1 the others don’t mention, such as Purchase orders. 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 Shelf OS, Oct 13, 2026 for Vamao Inventory OS; 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 Shelf OS, Oct 13, 2026 for Vamao Inventory OS. 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.