PO Validator B2B vs VatPO Pro
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 PO Validator B2B, Oct 14, 2026 for VatPO Pro.
The short answer
- Both list a free plan. Paid plans start at $4.99/month for PO Validator B2B and $3.99/month for VatPO Pro.
Head to head
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
VatPO Free
- · 1 field (VAT or PO), powered-by branding
VatPO Pro
- · 7-day trial, cancel anytime
- · Collect VAT & PO numbers at checkout
- · Custom field placeholders
- · No VatPO branding on Pro
- · Values saved to order attributes
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureB2B 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.
VatPO Pro adds two customizable fields to checkout — one for VAT number, one for Purchase Order number. What customers type is saved to the order, so your accounting and invoicing workflows stay clean without manual data entry. Enable both fields, or just one — each has its own toggle. Customize placeholders so buyers know exactly what to enter. If a customer refreshes checkout, their typed values are preserved.
- 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
- Two independent fields — enable VAT only, PO only, or both
- Values saved to order attributes, visible in Order Details
- Customizable placeholders — write the exact prompt you need
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 |  PO Validator B2B |  VatPO Pro |
|---|---|---|
| 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 | PO Validator B2B | VatPO Pro |
|---|---|---|
| App Store rating | Not published | Not published |
| App Store reviews | Not published | 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 | PO Validator B2B | VatPO Pro |
|---|---|---|
| Free plan | Yes | Yes |
| Lowest paid monthly plan | $4.99/month | $3.99/month(ahead) |
| Longest free trial | 7 days | 7 days |
| Plans listed | 3 | 2 |
Listing
| Measure | PO Validator B2B | VatPO Pro |
|---|---|---|
| Shopify category rank | #272(ahead) | #298 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Jun 8, 2026 | Aug 25, 2026 |
| Languages | 3 | 1 |
| Developer | byKlemm | joycraft |
FAQ
PO Validator B2B and VatPO Pro: common questions
- Is PO Validator B2B or VatPO Pro cheaper?
- Both list a free plan. Paid plans start at $4.99/month for PO Validator B2B and $3.99/month for VatPO Pro. 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 for PO Validator B2B, Oct 14, 2026 for VatPO Pro; 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 PO Validator B2B, Oct 14, 2026 for VatPO Pro. 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.