CostSonar vs Margin Leak
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 9, 2026 for CostSonar, Oct 14, 2026 for Margin Leak.
The short answer
- Only Margin Leak lists a free plan.
- CostSonar lists 1 features Margin Leak’s listing doesn’t mention, including Custom reports.
Head to head
Free
- · Full margin dashboard
- · Profit lost to discounts figure
- · Up to 50 orders analyzed per month
Basic Plan
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureShopify keeps one cost per inventory item. When you change it, the old value is replaced, so earlier margins stop matching. CostSonar records cost changes from its first check and keeps a dated history. It sorts your catalogue into variants selling below cost, variants with no cost set, and variants on a thin margin. Archived and draft products are skipped. Access is read-only. The app never writes to your store.
Margin 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.
- See the variants selling below cost, biggest loss per unit first
- Get an email when a product that was making money starts losing it
- Keep a dated record of cost changes from your first check
- Find products with no cost set, which profit reports cannot include
- 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
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 | Not listed | Yes |
| Lowest paid monthly plan | No monthly plan listed | $9/month |
| Longest free trial | Not listed | 14 days |
| Plans listed | Not published | 2 |
Listing
| Measure | Margin Leak | |
|---|---|---|
| Shopify category rank | Not enough data | #1369 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Oct 14, 2026 | Oct 2, 2026 |
| Languages | 1 | 1 |
| Developer | Marimon Apps | V5 Joining Technologies |
FAQ
CostSonar and Margin Leak: common questions
- Is CostSonar or Margin Leak cheaper?
- Only Margin Leak lists a free plan. 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?
- CostSonar lists 1 the others don’t mention, such as Custom reports. 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 Nov 9, 2026 for CostSonar, Oct 14, 2026 for Margin Leak; 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 9, 2026 for CostSonar, Oct 14, 2026 for Margin Leak. 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.