modlet

modlet, officially listed on the Shopify App Store as modlet: Block PO Box & Lockers, is a Shopify app in the Checkout - Other category. 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. It averages 5.00 out of 5 across 1 merchant reviews on the Shopify App Store.

modlet offers a free plan and 2 paid plans starting at $10/month and going up to $99.99/month. The free plan includes Block PO Boxes globally (Instant setup), Up to 250 Store Orders per Month, Native & Secure Checkout Validation, and Address Simulator & Testing Tool. The paid plans unlock advanced features beyond what's available on the free tier.

Yes — modlet offers a free plan alongside paid options. The free plan includes Block PO Boxes globally (Instant setup), Up to 250 Store Orders per Month, and Native & Secure Checkout Validation. Paid plans start at $10/month for advanced features.

modlet launched on March 9, 2026. In that time it has gathered 1 merchant reviews.

modlet does not currently carry Shopify's Built for Shopify badge. The badge is awarded to apps that meet Shopify's published standards for performance, ease of use, and merchant value — many high-quality apps operate without it.

Merchants commonly compare modlet with Payment Rules Hide PaymentHero, Magical Fee Surcharge + Tariff, EcoCart Green Protection, and Puco Checkout Rules. Each alternative covers a similar use case but differs on pricing model, integration depth, and the specific themes merchants praise in reviews — see the alternatives section above for a side-by-side.