CartShield: Discount Blocker vs Smart Bundles & Margin Guard
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 12, 2026 for CartShield, Oct 14, 2026 for Smart Bundles & Margin Guard.
The short answer
- Only CartShield lists a free plan. Paid plans start at $4.99/month for CartShield and $49/month for Smart Bundles & Margin Guard.
- CartShield lists 7 features Smart Bundles & Margin Guard’s listing doesn’t mention, including Cart discounts, Coupons, Discount codes.
Head to head
Free
- · 1 blocking rule
- · 2 rule types only
- · Basic error messages
- · Block All & Specific Codes
- · Email support
- · Limited to 1 rule
Basc
- · 5 blocking rules
- · 5 rules max
- · 6 rule types
- · Priority support
- · Sale item blocking
- · Smart Discounts
Pro
- · All 9 rule types
- · Allow List (whitelist)
- · Customer tag blocking
- · Priority support
- · Priority-based evaluation
- · Product tag blocking
Lifetime
- · All future features
- · Early adopter price
- · Everything in Pro
- · One-time payment
- · Priority support forever
- · Smart Discounts
Starter
Professional
Scale
Entreprise
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureCartShield lets you control which discount codes are accepted at checkout and on products. Create rules to block all codes, specific codes, or codes based on products, collections, customer tags, or cart total. The Allow List lets you whitelist approved codes and block everything else. Smart Discounts apply discounts only to full-price items, skipping products already on sale.
Every discount you launch is a bet on your margins. Miss the math once, and one promo can wipe out an order's profit. Smart Bundles & Margin Guard sets a gross margin floor and enforces it live at Shopify's checkout: our Function reads the cart, computes margin using your COGS, and blocks any discount that would push the order below your floor. Every decision is logged with the exact margin. Fully auditable trail.
- Block discount codes by product, collection, customer tag, or cart total
- Allow List: whitelist specific codes and block all others at checkout
- Smart Discounts: apply discounts only to full-price items, not sale items
- Custom error messages per rule shown instantly to customers at checkout
- Blocks discounts that would push order margin below your floor
- Runs as a Shopify Function — margin evaluated live at every cart, not after
- Full audit log — every APPROVED or REJECTED decision with reasoning
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 |  Smart Bundles & Margin Guard | |
|---|---|---|
| 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 | Smart Bundles & Margin Guard | |
|---|---|---|
| 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 | Smart Bundles & Margin Guard | |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $4.99/month(ahead) | $49/month |
| Longest free trial | 7 days | 30 days |
| Plans listed | 4 | 4 |
Listing
| Measure | Smart Bundles & Margin Guard | |
|---|---|---|
| Shopify category rank | Not enough data | #1120 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Nov 12, 2026 | Oct 1, 2026 |
| Languages | 1 | 1 |
| Developer | Apps Developer | Laminin & Company |
FAQ
CartShield and Smart Bundles & Margin Guard: common questions
- Is CartShield or Smart Bundles & Margin Guard cheaper?
- Only CartShield lists a free plan. Paid plans start at $4.99/month for CartShield and $49/month for Smart Bundles & Margin Guard. 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?
- CartShield lists 7 the others don’t mention, such as Cart discounts, Coupons, Discount codes, Discount stacking. Smart Bundles & Margin Guard lists 6 the others don’t mention, such as Analytics, Automations, Import and export, Percentage discounts. 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 12, 2026 for CartShield, Oct 14, 2026 for Smart Bundles & Margin Guard; 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 12, 2026 for CartShield, Oct 14, 2026 for Smart Bundles & Margin Guard. 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.