CartGuard vs Margin Defender: Block Coupons
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Sep 25, 2026 for CartGuard, Nov 9, 2026 for Margin Defender.
The short answer
- Margin Defender lists 2 features CartGuard’s listing doesn’t mention, including Filtering, Tagging.
Head to head
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Product Protection
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureCartGuard adds a checkout rule that stops an order when the cart holds a product you marked as not for sale. Mark a product with a tag, or switch on Block checkout for that one product. You can also block a product type, vendor, or theme template. Approved buyers still get through: exempt customers by tag, exempt one customer, or exempt every B2B buyer. Give a product a date and it starts selling that day.
Ever run a 20% off Black Friday sale, only to realise a customer used it on a premium product with a 10% margin? Margin Defender is your failsafe! Margin Defender prevents you from accidentally discounting premium items that should never be on sale. Simply tag specific products as "protected," and this app will block checkout if any discount code is applied while those items are in the cart.
- Block checkout by tag: Choose from preset tags or use your own
- Block by product type: Block entire product categories at once
- Block by template: Automatically tag products using a specific template suffix
- Custom error messages: Personalize the message customers see
- Exclude specific products from store-wide sales so you never sell at a loss
- Automatically block checkout if a protected item has a discount applied.
- Works seamlessly with both discount codes and automatic promotions.
- Failsafe design ensures checkout always works, even if validation times out.
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 |  CartGuard |  Margin Defender |
|---|---|---|
| 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 | CartGuard | Margin Defender |
|---|---|---|
| App Store rating | 5.0 ★ | Not published |
| App Store reviews | 2 | 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 | CartGuard | Margin Defender |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | No monthly plan listed | $5.99/month |
| Longest free trial | Not listed | 7 days |
| Plans listed | Not published | 1 |
Listing
| Measure | CartGuard | Margin Defender |
|---|---|---|
| Shopify category rank | #68 | #757 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Apr 20, 2026 | Mar 11, 2026 |
| Languages | 1 | 1 |
| Developer | KW Consulting | CosModo |
FAQ
CartGuard and Margin Defender: common questions
- What features does each app list that the other doesn’t?
- Margin Defender lists 2 the others don’t mention, such as Filtering, Tagging. 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 Sep 25, 2026 for CartGuard, Nov 9, 2026 for Margin Defender; 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 Sep 25, 2026 for CartGuard, Nov 9, 2026 for Margin Defender. 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.