PackOS Checkout vs Shippiz: Smart Shipping Rates
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 13, 2026.
The short answer
- On the Shopify App Store: PackOS Checkout 5.0 from 1 reviews and Shippiz 5.0 from 4 reviews.
- Shippiz lists 9 features PackOS Checkout’s listing doesn’t mention, including Custom notifications, Customer-based, Delivery date.
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
Free Shipping Plan
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.
Shippiz automatically compares rates across Shippiz's pre-negotiated rates and connected marketplaces - then selects the lowest-cost option for every order. No manual work, no workflow changes. Works with UPS, FedEx, USPS, and 20+ carriers, platforms, and marketplaces out of the box.
- 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
- Compare carrier rates instantly and choose the available option
- Get tailored shipping suggestions for every order with Shippiz automation
- Manage all shipments in one place — print labels and track deliveries easily
- Use your carrier accounts or Shippiz rates with simple, flexible setup
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 |  Shippiz |
|---|---|---|
| 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 | Shippiz |
|---|---|---|
| App Store rating | 5.0 ★ | 5.0 ★ |
| App Store reviews | 1 | 4(ahead) |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | PackOS Checkout | Shippiz |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | $50/month | No monthly plan listed |
| Longest free trial | 14 days | Not listed |
| Plans listed | 4 | 1 |
Listing
| Measure | PackOS Checkout | Shippiz |
|---|---|---|
| Shopify category rank | #391 | #166(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 | Nov 19, 2025 |
| Languages | 1 | 1 |
| Developer | PackOS | Shippiz inc |
FAQ
PackOS Checkout and Shippiz: common questions
- Which has better reviews, PackOS Checkout or Shippiz?
- On the Shopify App Store: PackOS Checkout 5.0 from 1 reviews and Shippiz 5.0 from 4 reviews.
- What features does each app list that the other doesn’t?
- PackOS Checkout lists 4 the others don’t mention, such as Flat fee, Multi-zone, Product-based, Quantity-based. Shippiz lists 9 the others don’t mention, such as Custom notifications, Customer-based, Delivery date, Delivery time. 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; 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. 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.