Shopify app
NewPromoMath: Discount Margins
Check your margins before you discount
- Rating on Shopify
- No ratings yet
- Reviews
- 0
- Developer
- James Builds
- Launched
- October 9, 2026
- Pricing
- $9/month. Free trial available.
- Languages
- English
The facts
Every value below is read from the listing or computed by the published formula. Nothing is a verdict.
Bayesian rating
n/a
category median 4.68
Reviews in the last 180 days
n/a
no dated reviews collected
1 and 2 star share
n/a
no rating distribution
Starting price
$9/month
band: Under $10 · 7-day trial
Pricing plans as listed on Shopify
All charges are billed in USD. Recurring and usage-based charges are billed every 30 days.
| Plan | Price | Billed yearly | Trial | Usage fee | Included |
|---|---|---|---|---|---|
| PromoMath | $9/month | not offered | 7 days | none stated | Safe, low margin, or losing money; Max safe discount for every variant; CSV export of every analysis; All products or one collection; Flags variants with no cost set |
Features Shopify lists for this app
Feature handles from the listing, grouped as Shopify groups them.
Pricing management
- Percentage discounts
Monitoring
- Reports
- Analytics
Data access
As disclosed on the listing. Never scored.
View staff and contributor data
Store owner
- Store owner: Name, email address, phone number, physical address
View store data
Products
- View products: Inventory, products, collections
Developer
James Builds
- Apps in the dataset:
- 2
- Address:
- Temperance, MI, US
- Website:
- jamesmckinney.xyz/promomath
- Support email domain:
- jamesmckinney.xyz
- English support:
- yes
- Resources:
- Privacy policy
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From the Shopify listingDeveloper claims, shown verbatim and collapsed. 105 words.Show
- Enter a discount and a margin floor, see every variant sorted in seconds
- Safe, Low margin, Losing money, or Missing cost on each variant
- Max safe discount per variant, so you know how far you can actually go
- Scope a check to all products, one collection, or a short product list
- Export results to CSV for your buying, finance, or planning notes
Check your margin before you launch a sale. See the safe discount limit on every variant.
You pick a discount. You pick the lowest gross margin you are willing to keep. PromoMath reads your live prices and cost per item from Shopify and sorts every variant into Safe, Low margin, Losing money, or Missing cost. It also shows the highest discount each variant can take and still clear your floor.
Run it on all products, one collection, or a few products. Export the results to CSV. There is nothing to install or sync, and your data stays in Shopify.
Requires Cost per item in Shopify.
Questions and comments
Questions people ask about PromoMath: Discount Margins, answered from what this page shows. Entries marked Site editor are written by the EcomAppReviews editor. Reader comments appear after a person has read and approved them, usually within a day. E-mail addresses are never published.
Last updated Oct 23, 2026. Ratings and review counts are the values shown on each app's public listing. How the numbers are computed: methodology.
0 reviews counted on the listing. Rating and count in the structured data are the values Shopify displayed when the listing was last refreshed.