BoxGuard: PO Box Blocker vs CartShield: Checkout Rules
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 3, 2026.
The short answer
- Both list a free plan. Paid plans start at $9.99/month for BoxGuard and $19.99/month for CartShield.
- CartShield lists 6 features BoxGuard’s listing doesn’t mention, including Cart-based, Max quantity, Min quantity.
Head to head
Free Plan
Pro Plan
Free Starter
- · 1 Active Checkout Validation Rule
- · Community Support
- · Standard PO Box & Address Validation
- · Sub-5ms WebAssembly Edge Execution
Pro Protection
- · B2B wholesale carton multiples
- · Collection min and max spend limits
- · Custom checkout error messages
- · PO Box and delivery blocker
- · Priority 24/7 merchant support
- · Real-time loss prevention telemetry
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureCarriers like FedEx and UPS cannot deliver to PO Boxes, causing returned packages, reshipment expenses, and address correction penalties. BoxGuard validates shipping addresses directly within Shopify Checkout before payment is processed. You can restrict PO Boxes, military APO/FPO addresses, parcel lockers, and custom keywords, while setting custom error prompts.
CartShield protects merchant profits by validating orders directly inside checkout using server-side Shopify Functions. Unlike legacy apps that rely on cart scripts bypassed by 1-click express wallets or browser tools, CartShield cannot be skipped. Prevent couriers from rejecting freight by blocking PO Boxes and parcel lockers.
- Block PO Boxes and parcel lockers in real time at checkout.
- Restrict military APO/FPO destinations and custom address keywords.
- Customize error messages to prompt buyers for a valid street address.
- Exempt trusted customer tags or apply rules to specific product tags.
- Block PO Boxes and parcel lockers for heavy freight and restricted items
- Require qualifying catalog items to purchase discounted sample kits
- Enforce B2B wholesale case pack multiples like cartons of 6, 12, or 24
- Validate checkout server-side across express digital wallets and one-page flows
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 | ||
|---|---|---|
| Detected stores | Not published | Not published |
| 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 | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | ||
|---|---|---|
| App Store rating | Not published | Not published |
| App Store reviews | Not published | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | ||
|---|---|---|
| Free plan | Yes | Yes |
| Lowest paid monthly plan | $9.99/month(ahead) | $19.99/month |
| Longest free trial | 7 days | 14 days |
| Plans listed | 2 | 2 |
Listing
| Measure | ||
|---|---|---|
| Shopify category rank | Not enough data | Not enough data |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Oct 31, 2026 | Nov 3, 2026 |
| Languages | 1 | 1 |
| Developer | Mad Syntax | ModApps |
FAQ
BoxGuard and CartShield: common questions
- Is BoxGuard or CartShield cheaper?
- Both list a free plan. Paid plans start at $9.99/month for BoxGuard and $19.99/month for CartShield. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- BoxGuard lists 1 the others don’t mention, such as Cart alerts. CartShield lists 6 the others don’t mention, such as Cart-based, Max quantity, Min quantity, Price-based. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- 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 3, 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 3, 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.