modlet: Block PO Box & Lockers

Name: modlet: Block PO Box & Lockers
Rating: 5 (1 reviews)
Author: modlet

Free plan

Stop costly carrier return fees with unlimited, free PO Box blocking. Prevent undeliverable addresses instantly. Upgrade for custom routing and exemptions.

5 (1 reviews)

| Launched Mar 2026

Screenshot of checkout with error message displayed under PO Box

Screenshot example of translations of error messages

Screenshot of address tester in admin-ui

Merchant Reviews

★★★★★

1 reviews

5 ★

4 ★

3 ★

2 ★

1 ★

30-Day Trends

Rating

5 from 5

Reviews

1 from 1

Category Rankings

Category
Marketing and conversion apps > Checkout
Make checkout the easiest part of your shopping experience.
Rank: 402 / 494
Last seen 2026-08-17
Category
Marketing and conversion apps > Checkout > Checkout - Other
Rank: 79 / 350
Last seen 2026-08-17

Collection Rankings

Collection
Apps for extending your checkout
Build a unique checkout for your business.
Rank: 1610 / -24
Last seen 2026-08-17
Collection
Apps for extending your checkout
Build a unique checkout for your business.
Rank: 1610 / 5260
Last seen 2026-08-17
Collection
Apps for extending your checkout
Build a unique checkout for your business.
Rank: 1610 / 5257
Last seen 2026-08-17
Collection
Apps for extending your checkout
Build a unique checkout for your business.
Rank: 1616 / -24
Last seen 2026-08-17
Collection
Apps for extending your checkout
Build a unique checkout for your business.
Rank: 1610 / 5260
Last seen 2026-08-17

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App Details

Developer modlet

Website modlet.app

Launched Mar 2026

Rating 5 ★ (1)

Pricing Free plan available. Free trial available.

Pricing Plans

Free Free

Block PO Boxes globally (Instant setup), Up to 250 Store Orders per Month, Native & Secure Checkout Validation, Address Simulator & Testing Tool

Pro $11 /mo

14-day free trial

Unlimited Orders & Address Validations, Custom Error Messages & Translations, Shipping Method Filtering, Product Exemptions, Country & Region Whitelisting, Granular Pattern Rules, VIP Customer Tag Exemptions

Enterprise $100 /mo

30-day free trial

White-Glove Setup & Dedicated Onboarding, On-Demand Custom Data Exports & Reports, Priority Custom Feature Development, Dedicated Technical Account Manager, 1-on-1 Workflow & Strategy Configuration, Guaranteed Custom SLA & Compliance Help

Works With

CheckoutShopify Admin

Languages

English