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Shopify rating
5.0 ★
1 reviews
Pricing
Free plan available
Free
Free
  • • Block PO Boxes globally (Instant setup)
  • • Up to 250 Store Orders per Month
  • • Native & Secure Checkout Validation
  • • Address Simulator & Testing Tool
Pro
$7.99/month
14-day free trial · or $79.99/year and save 17%
  • • Unlimited Orders & Address Validations
  • • Custom Error Messages & Translations
  • • Shipping Method Filtering
  • • Product Exemptions
  • • Country & Region Whitelisting
Enterprise
$99.99/month
30-day free trial · or $999.99/year and save 17%
  • • 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
What does modlet do?

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

  • Block PO Boxes and lockers worldwide to stop failed deliveries.
  • Secure checkout blocking that buyers cannot bypass or work around.
  • Test your blocking rules safely using the built-in address simulator.
  • Pro: Create custom error messages to match your brand and local languages.
  • Pro: Set specific exception rules for shipping methods, regions, or products.

Features

Checkout - Other
Review history
Daily review count on the Shopify App Store
1±0 · 29d· Rating steady at 5.0★

Daily tracking from Aug 10, 2026 through today · 29 days observed · sign up free for the full history →

Category rankings
Live organic position on Shopify App Store category pages
  • Checkout - Other
    #68▼5

Tracked daily · last 30 days · as of 2026-10-02

Catalog position
Within Checkout - Other on the App Store
Rank by reviews
#93 of 259
Review percentile
64th
Rating percentile
100th
On the App Store
0.6 yrs
Works with
Integrations listed for modlet: Block PO Box & Lockers
CheckoutShopify Admin
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Frequently asked questions

Stop costly carrier return fees with unlimited, free PO Box blocking. Prevent undeliverable addresses instantly. Upgrade for custom routing and exemptions. It's a checkout - other tool for ecommerce stores.