Carboy: Decant & Bulk Stock vs ONE: Variants Shared Inventory
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 6, 2026 for Carboy, Nov 2, 2026 for ONE.
The short answer
- Only Carboy lists a free plan. Paid plans start at $12/month for Carboy and $2.99/month for ONE.
- ONE lists 5 features Carboy’s listing doesn’t mention, including Inventory planning, Inventory sync, Low stock alerts.
Head to head
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free
- · 1 pool
- · Every feature included
Starter
- · Billed on your store invoice
- · Every feature
- · Up to 25 pools
Pro
- · Every feature
- · For catalogs of hundreds of products
- · Unlimited pools
Super
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureDecant shops, tea and spice merchants, roasters and refill stores sell the same product in several sizes cut from one bottle, sack or drum. Carboy keeps that bulk stock as one pool in ml, l, fl oz, g, kg, oz or lb and sets each size's stock in your store after every order, refund and cancellation.
Our app allows merchants to combine and synchronize inventory across multiple product variants, helping manage stock more efficiently. Instead of tracking inventory separately for each variant, merchants can group selected variants to share the same stock quantity. This is especially useful for products that represent the same physical inventory but are sold under different options or listings.
- Set up every product sold in sizes from one catalog scan
- Sizes read from variant names: 2ml, 250 g, 4 fl oz, 1 lb
- Orders, refunds and cancels recount every size; hand edits wait for you
- Daily fill list of what to decant or weigh for open orders
- Create groups of multiple variants that share a common inventory stock
- Set different stock reduction values for each variant based on inventory usage
- Automatically mark linked variants as sold out when shared stock reaches zero
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 |  ONE | |
|---|---|---|
| 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 | ONE | |
|---|---|---|
| App Store rating | Not published | 5.0 ★ |
| App Store reviews | Not published | 6 |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
FAQ
Carboy and ONE: common questions
- Is Carboy or ONE cheaper?
- Only Carboy lists a free plan. Paid plans start at $12/month for Carboy and $2.99/month for ONE. 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?
- Carboy lists 3 the others don’t mention, such as Custom reports, Replenishment reminders, Stock replenishment. ONE lists 5 the others don’t mention, such as Inventory planning, Inventory sync, Low stock alerts, Out of stock notifications. 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 Nov 6, 2026 for Carboy, Nov 2, 2026 for ONE; 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 Nov 6, 2026 for Carboy, Nov 2, 2026 for ONE. 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.