EL Address Validator vs PO Box Blocker Pro
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 8, 2026.
The short answer
- PO Box Blocker Pro is detected on 1.5× as many Shopify stores as EL Address Validator: 3 vs 2 as of Nov 8, 2026.
- Paid plans start at $4.99/month for EL Address Validator and $2.99/month for PO Box Blocker Pro.
Head to head
- Germany
- Canada
- United States
Pro
- · All Rules Available
- · Fully Translatable
- · Unlimited Validations
Essential
- · Auto health checks & self-repair
- · Block addresses FedEx, UPS & DHL reject
- · Built-in address tester
- · Custom checkout message
- · One-click automatic setup
- · Real-Time PO Box Blocking
Pro
- · Everything in Essential
- · Exempt products, variants, collections
- · PO boxes, lockers, bags & APO/FPO
- · Priority email support
- · Rules by country, state, city & postal
- · Unlimited orders and validations
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureEvery wrong address costs you time and cuts into your profit. EL Address Validator is the invisible guard for your checkout. It automatically blocks invalid addresses before the order is placed - saving you from expensive returns and frustrated customers. Check for House Numbers, PO Boxes, MeinEinkauf, DHL Packstation, custom regex & more. Set custom address rules for different countries. Compatible with any Theme.
PO Box Blocker Pro checks each shipping address at checkout and blocks addresses you can't deliver to before the order is placed. Block PO boxes, parcel lockers, locked bags, private bags and APO/FPO addresses, or restrict delivery by country, state, city or postal code. Allow chosen products, variants or collections to bypass the rules, set a custom checkout message, and test any address before going live.
- Works on any Shopify Plan (also Non-Plus)
- Show errors directly in the checkout.
- Check for House Numbers, PO Boxes, Typos, Special Characters, DHL Packstation
- Compatible with all express checkouts (like PayPal, Apple Pay, Google Pay etc.)
- Automatically detects and blocks PO Box addresses during checkout.
- Allows merchants to exempt specific products from PO Box blocking.
- Customize the message shown when customers enter a PO Box address.
- Works seamlessly with Shopify Checkout and doesn’t require any theme edits.
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 |  EL Address Validator |  PO Box Blocker Pro |
|---|---|---|
| Detected stores | 2 | 3(ahead) |
| 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 | Home & Garden | Home & Garden, Business & Industrial |
| Top store countries | Germany | Canada, United States |
Reviews
| Measure | EL Address Validator | PO Box Blocker Pro |
|---|---|---|
| App Store rating | Not published | 1.0 ★ |
| App Store reviews | Not published | 1 |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | EL Address Validator | PO Box Blocker Pro |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | $4.99/month | $2.99/month(ahead) |
| Longest free trial | 14 days | 14 days |
| Plans listed | 1 | 2 |
Listing
| Measure | EL Address Validator | PO Box Blocker Pro |
|---|---|---|
| Shopify category rank | #327 | #276(ahead) |
| Shopify App Charts | #4 in Shipping solutions - Other | #3 in Shipping solutions - Other |
| Built for Shopify | No | No |
| Launched | May 1, 2026 | Jul 4, 2025 |
| Languages | 1 | 1 |
| Developer | Lukas Zimmermann | Dev Kit |
FAQ
EL Address Validator and PO Box Blocker Pro: common questions
- Which is more popular, EL Address Validator or PO Box Blocker Pro?
- PO Box Blocker Pro is detected on 1.5× as many Shopify stores as EL Address Validator: 3 vs 2 as of Nov 8, 2026.
- Is EL Address Validator or PO Box Blocker Pro cheaper?
- Paid plans start at $4.99/month for EL Address Validator and $2.99/month for PO Box Blocker 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 Nov 8, 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 Nov 8, 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.