Checkout Address Validator vs PO Box Blocker — AddressFence
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
- Only PO Box Blocker lists a free plan. Paid plans start at $4.99/month for Checkout Address Validator and $9.99/month for PO Box Blocker.
Head to head
Standard
- · Block orders missing a house number
- · Buyer messages in every store language
- · Custom house-number rule per country
- · Require a postal code per country
- · Works on Shop Pay, PayPal & Apple Pay
Free
- · Shipping PO Box/locker + 10 ZIP rules
Pro
- · Free+: street #, messages, regions, CSV
Plus
- · Beyond Pro: billing rules + allowlists
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureExpress wallets — Shop Pay, PayPal, Apple Pay, Google Pay — skip your address form, so orders arrive with a street but no house number, or no postal code at all, and the delivery fails. A missing house number only produces a warning at checkout, which the buyer can ignore. This app turns it into a block: checkout cannot be completed until the address is fixed, wallets included.
AddressFence stops PO box and parcel locker addresses from being used as the shipping address at checkout. Install, turn on the PO box and locker rules, and they work right away; a small set of ZIP/postal rules is included free. When you need more, paid upgrades add street-number checks, custom checkout error messages, region rules, CSV import, billing-address rules and allowlists.
- Blocks checkout when a postal code or house number is missing
- Validates express wallet checkouts: Shop Pay, PayPal, Apple Pay, Google Pay
- Every country you ship to, with Shopify's postal-code rule prefilled
- P.O. boxes, packstations and pickup points are never blocked
- Publish checkout-native address rules without theme code.
- Block PO Boxes, lockers, ZIP/postal ranges, and unsupported regions.
- Preview, publish, roll back, and restore validation configs.
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 |  Checkout Address Validator |  PO Box Blocker |
|---|---|---|
| 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 | Checkout Address Validator | PO Box Blocker |
|---|---|---|
| App Store rating | 5.0 ★ | Not published |
| App Store reviews | 1 | 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 | Checkout Address Validator | PO Box Blocker |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | $4.99/month(ahead) | $9.99/month |
| Longest free trial | 7 days | Not listed |
| Plans listed | 1 | 3 |
Listing
| Measure | Checkout Address Validator | PO Box Blocker |
|---|---|---|
| Shopify category rank | #125(ahead) | #149 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Aug 17, 2026 | Jun 22, 2026 |
| Languages | 4 | 1 |
| Developer | Schwan I/O | momiji-shop |
FAQ
Checkout Address Validator and PO Box Blocker: common questions
- Is Checkout Address Validator or PO Box Blocker cheaper?
- Only PO Box Blocker lists a free plan. Paid plans start at $4.99/month for Checkout Address Validator and $9.99/month for PO Box Blocker. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- 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.