DoubleGuard vs SDB ‑ On Sale Discount Blocker
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 13, 2026 for DoubleGuard, Oct 14, 2026 for SDB.
The short answer
- Paid plans start at $1/month for DoubleGuard and $4.99/month for SDB.
- SDB lists 3 features DoubleGuard’s listing doesn’t mention, including Cart discounts, Checkout discounts, Custom discounts.
Head to head
Standard
Basic
- · All features available
- · Block all discount codes for sale items
- · Discount dashboard
- · Discount scheduling and management
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureDoubleGuard helps prevent double discounts on products already on sale. Create a percentage discount, and products with a compare-at price higher than their current price are automatically excluded. The discount applies only to regular-priced products, while eligible items receive the percentage you set in Shopify admin.
SDB prevents customers from using discount codes on products that are already on sale, ensuring your promotions do not stack unintentionally and lower your margins. Using Shopify’s compare-at pricing, it automatically blocks coupon codes or automatic discounts when items are already discounted, helping you run controlled, more profitable promotions.
- Exclude products already on sale from additional discounts
- Apply percentage discounts only to regular-priced products
- Set the discount percentage directly in Shopify admin
- Stop customers from using discount codes on already discounted products
- Quick and easy set-up, protect your margins almost instantly
- Easy management dashboard for your custom discounts
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 |  DoubleGuard |  SDB |
|---|---|---|
| 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 | DoubleGuard | SDB |
|---|---|---|
| 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 | DoubleGuard | SDB |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | $1/month(ahead) | $4.99/month |
| Longest free trial | 7 days | 7 days |
| Plans listed | 1 | 1 |
Listing
| Measure | DoubleGuard | SDB |
|---|---|---|
| Shopify category rank | #650 | Not enough data |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Sep 11, 2026 | May 27, 2026 |
| Languages | 1 | 1 |
| Developer | LeanMerchant Labs | North Stack |
FAQ
DoubleGuard and SDB: common questions
- Is DoubleGuard or SDB cheaper?
- Paid plans start at $1/month for DoubleGuard and $4.99/month for SDB. 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?
- SDB lists 3 the others don’t mention, such as Cart discounts, Checkout discounts, Custom 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 Oct 13, 2026 for DoubleGuard, Oct 14, 2026 for SDB; 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 Oct 13, 2026 for DoubleGuard, Oct 14, 2026 for SDB. 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.