---
title: "modlet: Block PO Box & Lockers Shopify App Profile"
description: "Protect your shipping margins with reliable, global PO Box blocking. Built natively into Shopify Checkout, it physically blocks checkout completion for restricted addresses—ensuring 100% reliability. Why offer a generous free tier? Built by a veteran cloud architect, our highly efficient infrastructure keeps costs low, and we love helping new stores get off the ground. Grow with us for free, and upgrade to Pro as your volume increases or when you need granular, custom shipping rules."
canonical_url: "https://shoplist.co/shopify-apps/modlet-block-po-box-lockers"
markdown_url: "https://shoplist.co/shopify-apps/modlet-block-po-box-lockers.md"
last_updated: "2026-10-31"
entity_type: "shopify_app"
slug: "modlet-block-po-box-lockers"
source: "public Shopify app profile allowlist"
---

# modlet: Block PO Box & Lockers Shopify App Profile

> Protect your shipping margins with reliable, global PO Box blocking. Built natively into Shopify Checkout, it physically blocks checkout completion for restricted addresses—ensuring 100% reliability. Why offer a generous free tier? Built by a veteran cloud architect, our highly efficient infrastructure keeps costs low, and we love helping new stores get off the ground. Grow with us for free, and upgrade to Pro as your volume increases or when you need granular, custom shipping rules.

## Quick answer
modlet: Block PO Box & Lockers has 0 detected stores in Shoplist. This Markdown profile displays 0 public brand examples; it is not a complete customer list.

## Key facts
- Name: modlet: Block PO Box & Lockers
- Monitoring status: Storefront detection limited
- Developer: modlet
- Developer profile: https://shoplist.co/app-developers/modlet
- Shopify App Store URL: https://apps.shopify.com/block-po-boxes-lockers
- Website: https://modlet.app
- Launch date: March 9, 2026
- Shoplist category: Shipping & Fulfillment
- Rating: 5
- Review count: 2
- Free plan signal: Yes
- Free trial signal: Yes

## Pricing summary
Free: Free; Pro: $7.99/month; Enterprise: $99.99/month

Shoplist has not yet found reliable public storefront evidence connecting a Shopify store to this app. This does not mean the app has no users. Some apps are new, admin-only, server-side, theme-independent, or otherwise difficult to detect from public storefront signals.


## App Signals
As of November 9, 2026:

- Stores running it: 0, 0.0% of the stores Shoplist tracks
- Store movement, last 28 days: +0 new stores, +0 returning, −0 removed, net 0 (estimated; 2 days held out of movement)
- Primary App Store category: Checkout - Other, #67 (14-day median position)
- Listing reviews: 2

## Public callouts
- Block PO Boxes, Lockers, and Military Addresses to prevent failed deliveries.
- Stop expensive UPS/FedEx carrier return fees instantly.
- Native Shopify Checkout integration—unhackable with zero theme code.
- Exempt specific countries or shipping methods from blocking rules.
- Perfect for general logistics or strictly regulated shipping requirements.
## Shopify App Store categories
- Checkout - Other

## Data note
Profile updated: October 31, 2026. This is the profile revision date, not a guarantee that every store was checked on that date.
Public snapshot built: 2026-11-09 12:13:32.480088\+00
Detection metrics refreshed: 2026-11-09 10:00:00.198215\+00
Public app evidence date: 2026-10-31 00:32:02.773576\+00
This generated Markdown profile intentionally exposes only public, stable app-profile fields and a small public app-stack sample from Shoplist. It excludes private contact data, people data, internal scores, crawl provenance, full datasets, and unstable operational fields.

## Related links
- [HTML app profile](https://shoplist.co/shopify-apps/modlet-block-po-box-lockers)
- [Shopify apps directory](https://shoplist.co/shopify-apps)
- [Shoplist data methodology](https://shoplist.co/data-methodology.md)