Margin Leak vs Mercury
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026 for Margin Leak, Nov 8, 2026 for Mercury.
The short answer
- Only Margin Leak lists a free plan. Paid plans start at $9/month for Margin Leak and $39/month for Mercury.
- Margin Leak lists 1 features Mercury’s listing doesn’t mention, including Custom dashboards.
Head to head
Free
- · Full margin dashboard
- · Profit lost to discounts figure
- · Up to 50 orders analyzed per month
Basic Plan
Starter
- · In-app risk alerts
- · Promotion Health dashboard
- · Stacked-discount detection
- · Up to 1,000 orders / 30 days
Growth
- · In-app risk alerts
- · Promotion Health dashboard
- · Stacked-discount detection
- · Up to 5,000 orders / 30 days
Scale
- · In-app risk alerts
- · Promotion Health dashboard
- · Stacked-discount detection
- · Up to 20,000 orders / 30 days
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureMargin Leak shows exactly how much profit your discounts are costing you — in dollars, by product and by order. Set a target gross margin and get alerted when any product or order drops below it. It uses the cost data already in Shopify, so there's no spreadsheet work. See profit before vs. after discounts across your orders, find your leakiest products, and catch margin damage while it's still small.
Mercury is a read-only promotion monitoring app that helps merchants understand how discounts affect orders. It highlights stacked discounts, discount exposure, risky promotion settings, and estimated potential leakage. Review promotion health, inspect affected orders in the Leakage Ledger, monitor promotion changes, and see alerts in one place.
- See profit before and after discounts across recent orders
- Identify products and orders below your target gross margin
- See how much potential profit is being lost to discounts
- Set your own gross margin target and get margin leak alerts
- See discount exposure, stacked discounts, and estimated potential leakage
- Review risky promotion settings such as no usage cap or no end date
- Inspect affected orders and discount combinations in the Leakage Ledger
- Get in-app alerts when monitored promotion settings become risky
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 |  Margin Leak | |
|---|---|---|
| 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 | Margin Leak | |
|---|---|---|
| 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 | Margin Leak | |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $9/month(ahead) | $39/month |
| Longest free trial | 14 days | 14 days |
| Plans listed | 2 | 3 |
Listing
| Measure | Margin Leak | |
|---|---|---|
| Shopify category rank | #1348 | 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 2, 2026 | Oct 17, 2026 |
| Languages | 1 | 1 |
| Developer | V5 Joining Technologies | Mercury Labs |
FAQ
Margin Leak and Mercury: common questions
- Is Margin Leak or Mercury cheaper?
- Only Margin Leak lists a free plan. Paid plans start at $9/month for Margin Leak and $39/month for Mercury. 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?
- Margin Leak lists 1 the others don’t mention, such as Custom dashboards. 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 14, 2026 for Margin Leak, Nov 8, 2026 for Mercury; 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 14, 2026 for Margin Leak, Nov 8, 2026 for Mercury. 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.