Checkout Address Validator vs PO Validator B2B
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 Validator B2B lists a free plan. Paid plans start at $4.99/month for Checkout Address Validator and $4.99/month for PO Validator B2B.
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
- · Built-in errors in EN, DE, FR, and ES
- · Required PO field enforced at checkout
Starter
- · Everything in Free
- · Minimum and maximum length validation
- · Regex patterns for ERP and SAP formats
- · Required prefix rule (e.g. "PO-")
Pro
- · 24/7 email support
- · Character rules: whitelist, no spaces
- · Custom error messages per language
- · Custom feature requests welcome
- · Everything in Starter
- · Personal onboarding session
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.
B2B merchants must attach a Purchase Order number to every order, but Shopify provides no native way to enforce this. Buyers skip the PO field or enter invalid data, causing fulfillment delays and ERP mismatches. PO Validator solves this with server-side validation via Shopify Functions. Buyers cannot complete checkout without a valid PO number.
- 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
- Server-side checkout validation that buyers cannot skip or bypass
- Flexible rules: length limits, required prefix, and regex for ERP formats
- Character rules: whitelist allowed characters and block unwanted spaces
- Regex rules: validate PO formats against ERP and SAP number patterns
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 Validator B2B |
|---|---|---|
| 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 Validator B2B |
|---|---|---|
| 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 Validator B2B |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | $4.99/month | $4.99/month |
| Longest free trial | 7 days | 7 days |
| Plans listed | 1 | 3 |
Listing
| Measure | Checkout Address Validator | PO Validator B2B |
|---|---|---|
| Shopify category rank | #125(ahead) | #272 |
| 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 8, 2026 |
| Languages | 4 | 3 |
| Developer | Schwan I/O | byKlemm |
FAQ
Checkout Address Validator and PO Validator B2B: common questions
- Is Checkout Address Validator or PO Validator B2B cheaper?
- Only PO Validator B2B lists a free plan. Paid plans start at $4.99/month for Checkout Address Validator and $4.99/month for PO Validator B2B. 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.