PackOS Checkout vs Shipping calculator: ShipMagic
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 13, 2026 for PackOS Checkout, Nov 3, 2026 for Shipping calculator.
The short answer
- On the Shopify App Store: PackOS Checkout 5.0 from 1 reviews and Shipping calculator 4.9 from 123 reviews.
- Only Shipping calculator lists a free plan. Paid plans start at $50/month for PackOS Checkout and $14/month for Shipping calculator.
- Shipping calculator lists 9 features PackOS Checkout’s listing doesn’t mention, including Customer-based, Delivery time, Distance-based.
Head to head
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Starter
- · 1,000 checkout rate calculations/mo
- · 90-day margin history
- · Box size library
- · Email support
- · Label purchasing
- · Real-time rates at checkout
Basic
- · 3,000 checkout rate calculations/mo
- · 6-month margin history
- · CSV import
- · Everything in Starter
Growth
- · 12-month margin history
- · 8,000 checkout rate calculations/mo
- · Automation rules
- · Everything in Basic
- · Priority email support
Pro
- · 20,000 checkout rate calculations/mo
- · Advanced automation rules
- · Everything in Growth
- · Multiple ship-from locations
- · Priority chat support
Sandbox / Test
- · Customizable shipping discounts
- · Hide, rename, sort shipping rates
- · Live Carrier Rates
- · Rate blending
- · Rates by zipcode, products, customer
- · Use full app in test mode only
Starter
- · Customizable shipping discounts
- · Hide shipping rates conditionally
- · Live chat + Email support
- · Rename & reorder rates conditionally
- · Use customizations in live mode
- · Use shipping discounts in live mode
Pro
- · Advanced rate blending
- · All features in "Starter" plan
- · Developer API
- · Live Carrier Rates
- · Live chat + Email support
- · Rates by zipcode, products, customer
Pro+
- · All features in "Starter" plan
- · Custom coded shipping rate logic
- · Developer API
- · Live chat + Email support
- · Skilled human developer for coding
- · Use shipping rates in live mode
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featurePackOS solves the problem of inaccurate shipping rates at checkout. When box size is estimated incorrectly, merchants either overcharge customers and lose carts, or undercharge and lose margin. PackOS uses bin-packing logic to determine which box an order actually fits in, then queries live rates from USPS, UPS, FedEx, and other carriers for that specific package.
Set up custom shipping rates, rules and discounts in minutes - no coding required. Create shipping rates using product, cart, customer, zipcode, distance, metafields, dimensions and 25+ params to control exactly what shipping rates customers see at checkout. Show live carrier rates, tiered rates, per item rates, percentage rates, etc. Blend shipping rates from multiple profiles or rules.
- Bin-packing engine selects the recommended box for each order automatically
- Live carrier rates from USPS, UPS, and FedEx returned at checkout
- Configurable box inventory, carrier settings, and shipping rules
- Set shipping rates by 25+ parameters like product tag, cart total, pincode, etc
- Assign different package sizes for different product & show live carrier rates
- Charge shipping rates per product in cart
- Avoid doubling of shipping rates because of multiple locations (flat rates only)
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 |  PackOS Checkout | Shipping calculator |
|---|---|---|
| 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 | PackOS Checkout | Shipping calculator |
|---|---|---|
| App Store rating | 5.0 ★(ahead) | 4.9 ★ |
| App Store reviews | 1 | 123(ahead) |
| New reviews, 28 days | Not enough data | 1 |
| Reviewers a year or more in | Not enough data | 35% |
Pricing
| Measure | PackOS Checkout | Shipping calculator |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | $50/month | $14/month(ahead) |
| Longest free trial | 14 days | 14 days |
| Plans listed | 4 | 4 |
Listing
| Measure | PackOS Checkout | Shipping calculator |
|---|---|---|
| Shopify category rank | #391 | #41(ahead) |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | May 20, 2026 | Jul 7, 2023 |
| Languages | 1 | 1 |
| Developer | PackOS | Speedy Squirrel |
FAQ
PackOS Checkout and Shipping calculator: common questions
- Is PackOS Checkout or Shipping calculator cheaper?
- Only Shipping calculator lists a free plan. Paid plans start at $50/month for PackOS Checkout and $14/month for Shipping calculator. 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, PackOS Checkout or Shipping calculator?
- On the Shopify App Store: PackOS Checkout 5.0 from 1 reviews and Shipping calculator 4.9 from 123 reviews.
- What features does each app list that the other doesn’t?
- PackOS Checkout lists 2 the others don’t mention, such as Address validation, Dimension-based. Shipping calculator lists 9 the others don’t mention, such as Customer-based, Delivery time, Distance-based, Hide rates. 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 13, 2026 for PackOS Checkout, Nov 3, 2026 for Shipping calculator; 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 13, 2026 for PackOS Checkout, Nov 3, 2026 for Shipping calculator. 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.